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Introduction
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nats.io
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What is NATS
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Subject-Based Messaging
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Publish-Subscribe
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Request-Reply
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Queue Groups
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Acknowledgements
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Sequence Numbers
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Introduction
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Connecting
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Connecting to the Default Server
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Connecting to a Specific Server
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</a>
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Connecting to a Cluster
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</a>
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Setting a Connect Timeout
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Ping/Pong Protocol
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Controlling the Client/Server Protocol
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</a>
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Turning Off Echo'd Messages
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</a>
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<a href="../reconnect/intro.html">
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Automatic Reconnections
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</a>
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Disabling Reconnect
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<a href="../reconnect/max.html">
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Set the Number of Reconnect Attempts
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</a>
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<li class="chapter " data-level="3.3.3" data-path="../reconnect/wait.html">
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<a href="../reconnect/wait.html">
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Pausing Between Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.4" data-path="../reconnect/random.html">
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<a href="../reconnect/random.html">
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Avoiding the Thundering Herd
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</a>
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<li class="chapter " data-level="3.3.5" data-path="../reconnect/events.html">
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Listening for Reconnect Events
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</a>
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<a href="../reconnect/buffer.html">
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Buffering Messages During Reconnect Attempts
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</a>
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</ul>
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<li class="chapter " data-level="3.4" data-path="../security/intro.html">
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<a href="../security/intro.html">
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Securing Connections
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</a>
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<ul class="articles">
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<a href="../security/userpass.html">
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Authenticating with a User and Password
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</a>
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<li class="chapter " data-level="3.4.2" data-path="../security/token.html">
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<a href="../security/token.html">
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Authenticating with a Token
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</a>
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</li>
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<li class="chapter " data-level="3.4.3" data-path="../security/nkey.html">
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<a href="../security/nkey.html">
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Authenticating with an NKey
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</a>
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</li>
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<li class="chapter " data-level="3.4.4" data-path="../security/creds.html">
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<a href="../security/creds.html">
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Authenticating with a Credentials File
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</a>
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</li>
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<li class="chapter " data-level="3.4.5" data-path="../security/tls.html">
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<a href="../security/tls.html">
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Encrypting Connections with TLS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.5" data-path="../receiving/intro.html">
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<a href="../receiving/intro.html">
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Receiving Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.5.1" data-path="../receiving/sync.html">
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<a href="../receiving/sync.html">
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Synchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.2" data-path="../receiving/async.html">
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<a href="../receiving/async.html">
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Asynchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.3" data-path="../receiving/unsubscribing.html">
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<a href="../receiving/unsubscribing.html">
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Unsubscribing
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</a>
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</li>
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<li class="chapter " data-level="3.5.4" data-path="../receiving/unsub_after.html">
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<a href="../receiving/unsub_after.html">
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Unsubscribing After N Messages
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</a>
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</li>
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<li class="chapter " data-level="3.5.5" data-path="../receiving/reply.html">
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<a href="../receiving/reply.html">
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Replying to a Message
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</a>
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</li>
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<li class="chapter " data-level="3.5.6" data-path="../receiving/wildcards.html">
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<a href="../receiving/wildcards.html">
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Wildcard Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.7" data-path="../receiving/queues.html">
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<a href="../receiving/queues.html">
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Queue Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.8" data-path="../receiving/drain.html">
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<a href="../receiving/drain.html">
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Draining Messages Before Disconnect
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</a>
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</li>
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<li class="chapter " data-level="3.5.9" data-path="../receiving/structure.html">
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<a href="../receiving/structure.html">
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Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.6" data-path="../sending/intro.html">
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<a href="../sending/intro.html">
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Sending Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.6.1" data-path="../sending/replyto.html">
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<a href="../sending/replyto.html">
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Including a Reply Subject
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</a>
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</li>
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<li class="chapter " data-level="3.6.2" data-path="../sending/request_reply.html">
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<a href="../sending/request_reply.html">
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Request-Reply Semantics
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</a>
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</li>
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<li class="chapter " data-level="3.6.3" data-path="../sending/caches.html">
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<a href="../sending/caches.html">
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Caches, Flush and Ping
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</a>
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</li>
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<li class="chapter " data-level="3.6.4" data-path="../sending/structure.html">
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<a href="../sending/structure.html">
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Sending Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.7" data-path="intro.html">
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<a href="intro.html">
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Monitoring the Connection
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.7.1" data-path="events.html">
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<a href="events.html">
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Listen for Connection Events
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</a>
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</li>
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<li class="chapter active" data-level="3.7.2" data-path="slow.html">
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<a href="slow.html">
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Slow Consumers
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.8" data-path="../tutorials/intro.html">
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<a href="../tutorials/intro.html">
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Tutorials
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.8.1" data-path="../tutorials/pubsub.html">
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<a href="../tutorials/pubsub.html">
|
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Explore NATS Pub/Sub
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</a>
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</li>
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<li class="chapter " data-level="3.8.2" data-path="../tutorials/reqreply.html">
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<a href="../tutorials/reqreply.html">
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Explore NATS Request/Reply
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</a>
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</li>
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|
<li class="chapter " data-level="3.8.3" data-path="../tutorials/queues.html">
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<a href="../tutorials/queues.html">
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Explore NATS Queueing
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</a>
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</li>
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|
<li class="chapter " data-level="3.8.4" data-path="../tutorials/custom_dialer.html">
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|
<a href="../tutorials/custom_dialer.html">
|
|
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|
|
Advanced Connect and Custom Dialer in Go
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</a>
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</li>
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</ul>
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</li>
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<li class="header">NATS Server</li>
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<li class="chapter " data-level="4.1" data-path="../../nats_server/installation.html">
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|
<a href="../../nats_server/installation.html">
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|
Installing
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</a>
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</li>
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<li class="chapter " data-level="4.2" data-path="../../nats_server/running.html">
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<a href="../../nats_server/running.html">
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Running
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</a>
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<ul class="articles">
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<li class="chapter " data-level="4.2.1" data-path="../../nats_server/windows_srv.html">
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|
<a href="../../nats_server/windows_srv.html">
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|
Window Service
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="4.3" data-path="../../nats_server/clients.html">
|
|
|
|
<a href="../../nats_server/clients.html">
|
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|
|
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|
Clients
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</a>
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</li>
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|
<li class="chapter " data-level="4.4" data-path="../../nats_server/flags.html">
|
|
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|
<a href="../../nats_server/flags.html">
|
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|
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|
Flags
|
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</a>
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</li>
|
|
|
|
<li class="chapter " data-level="4.5" data-path="../../nats_server/configuration.html">
|
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|
<a href="../../nats_server/configuration.html">
|
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|
|
Configuration
|
|
|
|
</a>
|
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|
<ul class="articles">
|
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|
|
|
<li class="chapter " data-level="4.5.1" data-path="../../nats_server/securing_nats.html">
|
|
|
|
<a href="../../nats_server/securing_nats.html">
|
|
|
|
|
|
Securing NATS
|
|
|
|
</a>
|
|
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|
<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1.1" data-path="../../nats_server/tls.html">
|
|
|
|
<a href="../../nats_server/tls.html">
|
|
|
|
|
|
Enabling TLS
|
|
|
|
</a>
|
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|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2" data-path="../../nats_server/auth_intro.html">
|
|
|
|
<a href="../../nats_server/auth_intro.html">
|
|
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|
|
|
Authentication
|
|
|
|
</a>
|
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<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1.2.1" data-path="../../nats_server/tokens.html">
|
|
|
|
<a href="../../nats_server/tokens.html">
|
|
|
|
|
|
Tokens
|
|
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|
</a>
|
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|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.2" data-path="../../nats_server/username_password.html">
|
|
|
|
<a href="../../nats_server/username_password.html">
|
|
|
|
|
|
Username/Password
|
|
|
|
</a>
|
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|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.3" data-path="../../nats_server/tls_mutual_auth.html">
|
|
|
|
<a href="../../nats_server/tls_mutual_auth.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.4" data-path="../../nats_server/nkey_auth.html">
|
|
|
|
<a href="../../nats_server/nkey_auth.html">
|
|
|
|
|
|
NKeys
|
|
|
|
</a>
|
|
|
|
|
|
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|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.5" data-path="../../nats_server/accounts.html">
|
|
|
|
<a href="../../nats_server/accounts.html">
|
|
|
|
|
|
Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.6" data-path="../../nats_server/jwt_auth.html">
|
|
|
|
<a href="../../nats_server/jwt_auth.html">
|
|
|
|
|
|
JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.7" data-path="../../nats_server/auth_timeout.html">
|
|
|
|
<a href="../../nats_server/auth_timeout.html">
|
|
|
|
|
|
Authentication Timeout
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.3" data-path="../../nats_server/authorization.html">
|
|
|
|
<a href="../../nats_server/authorization.html">
|
|
|
|
|
|
Authorization
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2" data-path="../../nats_server/clustering.html">
|
|
|
|
<a href="../../nats_server/clustering.html">
|
|
|
|
|
|
Clustering
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.2.1" data-path="../../nats_server/cluster_config.html">
|
|
|
|
<a href="../../nats_server/cluster_config.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2.2" data-path="../../nats_server/cluster_tls.html">
|
|
|
|
<a href="../../nats_server/cluster_tls.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.3" data-path="../../gateways/">
|
|
|
|
<a href="../../gateways/">
|
|
|
|
|
|
Gateways
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.3.1" data-path="../../gateways/gateway.html">
|
|
|
|
<a href="../../gateways/gateway.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.4" data-path="../../leafnodes/">
|
|
|
|
<a href="../../leafnodes/">
|
|
|
|
|
|
Leaf Nodes
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.4.1" data-path="../../leafnodes/leafnode_conf.html">
|
|
|
|
<a href="../../leafnodes/leafnode_conf.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.5" data-path="../../nats_server/logging.html">
|
|
|
|
<a href="../../nats_server/logging.html">
|
|
|
|
|
|
Logging
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.6" data-path="../../nats_server/monitoring.html">
|
|
|
|
<a href="../../nats_server/monitoring.html">
|
|
|
|
|
|
Monitoring
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6" data-path="../../nats_admin/">
|
|
|
|
<a href="../../nats_admin/">
|
|
|
|
|
|
Managing A NATS Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.1" data-path="../../nats_admin/upgrading_cluster.html">
|
|
|
|
<a href="../../nats_admin/upgrading_cluster.html">
|
|
|
|
|
|
Upgrading a Cluster
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.2" data-path="../../nats_admin/slow_consumers.html">
|
|
|
|
<a href="../../nats_admin/slow_consumers.html">
|
|
|
|
|
|
Slow Consumers
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.3" data-path="../../nats_admin/signals.html">
|
|
|
|
<a href="../../nats_admin/signals.html">
|
|
|
|
|
|
Signals
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.4" data-path="../../sys_accounts/">
|
|
|
|
<a href="../../sys_accounts/">
|
|
|
|
|
|
System Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.4.1" data-path="../../sys_accounts/sys_accounts.html">
|
|
|
|
<a href="../../sys_accounts/sys_accounts.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
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|
|
</li>
|
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|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7" data-path="../../nats_docker/">
|
|
|
|
<a href="../../nats_docker/">
|
|
|
|
|
|
NATS and Docker
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.7.1" data-path="../../nats_docker/nats-docker-tutorial.html">
|
|
|
|
<a href="../../nats_docker/nats-docker-tutorial.html">
|
|
|
|
|
|
Tutorial
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7.2" data-path="../../nats_docker/docker_swarm.html">
|
|
|
|
<a href="../../nats_docker/docker_swarm.html">
|
|
|
|
|
|
Docker Swarm
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
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|
|
|
|
|
|
|
|
<li class="header">NATS Tools</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="5.1" data-path="../../nats_tools/mkpasswd.html">
|
|
|
|
<a href="../../nats_tools/mkpasswd.html">
|
|
|
|
|
|
mkpasswd
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2" data-path="../../nats_tools/nk.html">
|
|
|
|
<a href="../../nats_tools/nk.html">
|
|
|
|
|
|
nk
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3" data-path="../../nats_tools/nsc/">
|
|
|
|
<a href="../../nats_tools/nsc/">
|
|
|
|
|
|
nsc
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.3.1" data-path="../../nats_tools/nsc/nsc.html">
|
|
|
|
<a href="../../nats_tools/nsc/nsc.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.2" data-path="../../nats_tools/nsc/streams.html">
|
|
|
|
<a href="../../nats_tools/nsc/streams.html">
|
|
|
|
|
|
Streams
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.3" data-path="../../nats_tools/nsc/services.html">
|
|
|
|
<a href="../../nats_tools/nsc/services.html">
|
|
|
|
|
|
Services
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.4" data-path="../../nats_tools/nsc/signing_keys.html">
|
|
|
|
<a href="../../nats_tools/nsc/signing_keys.html">
|
|
|
|
|
|
Signing Keys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.5" data-path="../../nats_tools/nsc/revocation.html">
|
|
|
|
<a href="../../nats_tools/nsc/revocation.html">
|
|
|
|
|
|
Revocation
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.6" data-path="../../nats_tools/nsc/managed.html">
|
|
|
|
<a href="../../nats_tools/nsc/managed.html">
|
|
|
|
|
|
Managed Operators
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
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|
</li>
|
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|
|
<li class="chapter " data-level="5.4" data-path="../../nats_tools/nas/">
|
|
|
|
<a href="../../nats_tools/nas/">
|
|
|
|
|
|
nats-account-server
|
|
|
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</a>
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<ul class="articles">
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<li class="chapter " data-level="5.4.1" data-path="../../nats_tools/nas/nas_conf.html">
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<a href="../../nats_tools/nas/nas_conf.html">
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Basics
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</a>
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</li>
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<li class="chapter " data-level="5.4.2" data-path="../../nats_tools/nas/inspecting_jwts.html">
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<a href="../../nats_tools/nas/inspecting_jwts.html">
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Inspecting JWTs
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</a>
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</li>
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<li class="chapter " data-level="5.4.3" data-path="../../nats_tools/nas/dir_store.html">
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<a href="../../nats_tools/nas/dir_store.html">
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Directory Store
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</a>
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</li>
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<li class="chapter " data-level="5.4.4" data-path="../../nats_tools/nas/notifications.html">
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<a href="../../nats_tools/nas/notifications.html">
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Update Notifications
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</a>
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</li>
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<li class="chapter " data-level="5.4.5" data-path="../../nats_tools/nas/mem_resolver.html">
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<a href="../../nats_tools/nas/mem_resolver.html">
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Memory Resolver
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.5" data-path="../../nats_tools/nats_top/">
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<a href="../../nats_tools/nats_top/">
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nats-top
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</a>
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<ul class="articles">
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<li class="chapter " data-level="5.5.1" data-path="../../nats_tools/nats_top/nats-top-tutorial.html">
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<a href="../../nats_tools/nats_top/nats-top-tutorial.html">
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Tutorial
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.6" data-path="../../nats_tools/natsbench.html">
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<a href="../../nats_tools/natsbench.html">
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nats-bench
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</a>
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</li>
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<li class="header">NATS Streaming Concepts</li>
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<li class="chapter " data-level="6.1" data-path="../../nats_streaming/intro.html">
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<a href="../../nats_streaming/intro.html">
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Introduction
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</a>
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</li>
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<li class="chapter " data-level="6.2" data-path="../../nats_streaming/relation-to-nats.html">
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<a href="../../nats_streaming/relation-to-nats.html">
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Relation to NATS
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</a>
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</li>
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<li class="chapter " data-level="6.3" data-path="../../nats_streaming/client-connections.html">
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<a href="../../nats_streaming/client-connections.html">
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Client Connections
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</a>
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</li>
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<li class="chapter " data-level="6.4" data-path="../../nats_streaming/channels/channels.html">
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<a href="../../nats_streaming/channels/channels.html">
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Channels
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.4.1" data-path="../../nats_streaming/channels/message-log.html">
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<a href="../../nats_streaming/channels/message-log.html">
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Message Log
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</a>
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</li>
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<li class="chapter " data-level="6.4.2" data-path="../../nats_streaming/channels/subscriptions/subscriptions.html">
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<a href="../../nats_streaming/channels/subscriptions/subscriptions.html">
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Subscriptions
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.4.2.1" data-path="../../nats_streaming/channels/subscriptions/regular.html">
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<a href="../../nats_streaming/channels/subscriptions/regular.html">
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Regular
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</a>
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</li>
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<li class="chapter " data-level="6.4.2.2" data-path="../../nats_streaming/channels/subscriptions/durable.html">
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<a href="../../nats_streaming/channels/subscriptions/durable.html">
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Durable
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</a>
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</li>
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<li class="chapter " data-level="6.4.2.3" data-path="../../nats_streaming/channels/subscriptions/queue-group.html">
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<a href="../../nats_streaming/channels/subscriptions/queue-group.html">
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Queue Group
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</a>
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</li>
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<li class="chapter " data-level="6.4.2.4" data-path="../../nats_streaming/channels/subscriptions/redelivery.html">
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<a href="../../nats_streaming/channels/subscriptions/redelivery.html">
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Redelivery
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</a>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.5" data-path="../../nats_streaming/store-interface.html">
|
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|
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<a href="../../nats_streaming/store-interface.html">
|
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Store Interface
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</a>
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</li>
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<li class="chapter " data-level="6.6" data-path="../../nats_streaming/store-encryption.html">
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<a href="../../nats_streaming/store-encryption.html">
|
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Store Encryption
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</a>
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</li>
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<li class="chapter " data-level="6.7" data-path="../../nats_streaming/clustering/clustering.html">
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|
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<a href="../../nats_streaming/clustering/clustering.html">
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Clustering
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.7.1" data-path="../../nats_streaming/clustering/supported-stores.html">
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|
<a href="../../nats_streaming/clustering/supported-stores.html">
|
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Supported Stores
|
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</a>
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</li>
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<li class="chapter " data-level="6.7.2" data-path="../../nats_streaming/clustering/configuration.html">
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<a href="../../nats_streaming/clustering/configuration.html">
|
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Configuration
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</a>
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</li>
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<li class="chapter " data-level="6.7.3" data-path="../../nats_streaming/clustering/auto-configuration.html">
|
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|
<a href="../../nats_streaming/clustering/auto-configuration.html">
|
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|
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Auto Configuration
|
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</a>
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</li>
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<li class="chapter " data-level="6.7.4" data-path="../../nats_streaming/clustering/containers.html">
|
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|
<a href="../../nats_streaming/clustering/containers.html">
|
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|
|
Containers
|
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</a>
|
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</li>
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</ul>
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</li>
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|
<li class="chapter " data-level="6.8" data-path="../../nats_streaming/fault-tolerance/ft.html">
|
|
|
|
<a href="../../nats_streaming/fault-tolerance/ft.html">
|
|
|
|
|
|
Fault Tolerance
|
|
|
|
</a>
|
|
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<ul class="articles">
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<li class="chapter " data-level="6.8.1" data-path="../../nats_streaming/fault-tolerance/active-server.html">
|
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|
|
<a href="../../nats_streaming/fault-tolerance/active-server.html">
|
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|
|
|
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Active Server
|
|
|
|
</a>
|
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</li>
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<li class="chapter " data-level="6.8.2" data-path="../../nats_streaming/fault-tolerance/standby-server.html">
|
|
|
|
<a href="../../nats_streaming/fault-tolerance/standby-server.html">
|
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|
|
Standby Servers
|
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|
|
</a>
|
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</li>
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<li class="chapter " data-level="6.8.3" data-path="../../nats_streaming/fault-tolerance/shared-state.html">
|
|
|
|
<a href="../../nats_streaming/fault-tolerance/shared-state.html">
|
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|
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|
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Shared State
|
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|
</a>
|
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</li>
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<li class="chapter " data-level="6.8.4" data-path="../../nats_streaming/fault-tolerance/failover.html">
|
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|
|
<a href="../../nats_streaming/fault-tolerance/failover.html">
|
|
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|
|
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Failover
|
|
|
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</a>
|
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</li>
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</ul>
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</li>
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|
<li class="chapter " data-level="6.9" data-path="../../nats_streaming/partitioning.html">
|
|
|
|
<a href="../../nats_streaming/partitioning.html">
|
|
|
|
|
|
Partitioning
|
|
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</a>
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</li>
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<li class="chapter " data-level="6.10" data-path="../../nats_streaming/monitoring/monitoring.html">
|
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|
|
<a href="../../nats_streaming/monitoring/monitoring.html">
|
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|
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|
|
Monitoring
|
|
|
|
</a>
|
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<ul class="articles">
|
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<li class="chapter " data-level="6.10.1" data-path="../../nats_streaming/monitoring/endpoints.html">
|
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|
<a href="../../nats_streaming/monitoring/endpoints.html">
|
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Endpoints
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</a>
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</li>
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</ul>
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</li>
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<li class="header">Developing With NATS Streaming</li>
|
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|
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<li class="chapter " data-level="7.1" data-path="../streaming/">
|
|
|
|
<a href="../streaming/">
|
|
|
|
|
|
Introduction
|
|
|
|
</a>
|
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|
|
|
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</li>
|
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|
<li class="chapter " data-level="7.2" data-path="../streaming/connecting.html">
|
|
|
|
<a href="../streaming/connecting.html">
|
|
|
|
|
|
Connecting to NATS Streaming
|
|
|
|
</a>
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.3" data-path="../streaming/publishing.html">
|
|
|
|
<a href="../streaming/publishing.html">
|
|
|
|
|
|
Publishing to a Channel
|
|
|
|
</a>
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.4" data-path="../streaming/receiving.html">
|
|
|
|
<a href="../streaming/receiving.html">
|
|
|
|
|
|
Receiving Messages from a Channel
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.5" data-path="../streaming/durables.html">
|
|
|
|
<a href="../streaming/durables.html">
|
|
|
|
|
|
Durable Subscriptions
|
|
|
|
</a>
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.6" data-path="../streaming/queues.html">
|
|
|
|
<a href="../streaming/queues.html">
|
|
|
|
|
|
Queue Subscriptions
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.7" data-path="../streaming/acks.html">
|
|
|
|
<a href="../streaming/acks.html">
|
|
|
|
|
|
Acknowledgements
|
|
|
|
</a>
|
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|
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|
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|
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</li>
|
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|
|
<li class="chapter " data-level="7.8" data-path="../streaming/protocol.html">
|
|
|
|
<a href="../streaming/protocol.html">
|
|
|
|
|
|
The Streaming Protocol
|
|
|
|
</a>
|
|
|
|
|
|
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</li>
|
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|
|
<li class="header">NATS Streaming Server</li>
|
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|
|
|
|
|
|
<li class="chapter " data-level="8.1" data-path="../../nats_streaming/gettingstarted/changes.html">
|
|
|
|
<a href="../../nats_streaming/gettingstarted/changes.html">
|
|
|
|
|
|
Important Changes
|
|
|
|
</a>
|
|
|
|
|
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</li>
|
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|
|
<li class="chapter " data-level="8.2" data-path="../../nats_streaming/gettingstarted/install.html">
|
|
|
|
<a href="../../nats_streaming/gettingstarted/install.html">
|
|
|
|
|
|
Installing
|
|
|
|
</a>
|
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|
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|
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</li>
|
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|
|
<li class="chapter " data-level="8.3" data-path="../../nats_streaming/gettingstarted/run.html">
|
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|
|
<a href="../../nats_streaming/gettingstarted/run.html">
|
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|
|
|
|
Running
|
|
|
|
</a>
|
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|
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</li>
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|
<li class="chapter " data-level="8.4" data-path="../../nats_streaming/configuring/configuring.html">
|
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|
|
<a href="../../nats_streaming/configuring/configuring.html">
|
|
|
|
|
|
Configuring
|
|
|
|
</a>
|
|
|
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|
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|
<ul class="articles">
|
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|
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|
<li class="chapter " data-level="8.4.1" data-path="../../nats_streaming/configuring/cmdline.html">
|
|
|
|
<a href="../../nats_streaming/configuring/cmdline.html">
|
|
|
|
|
|
Command line arguments
|
|
|
|
</a>
|
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|
|
|
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</li>
|
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|
|
<li class="chapter " data-level="8.4.2" data-path="../../nats_streaming/configuring/cfgfile.html">
|
|
|
|
<a href="../../nats_streaming/configuring/cfgfile.html">
|
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|
|
|
|
Configuration file
|
|
|
|
</a>
|
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|
|
|
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</li>
|
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|
<li class="chapter " data-level="8.4.3" data-path="../../nats_streaming/configuring/storelimits.html">
|
|
|
|
<a href="../../nats_streaming/configuring/storelimits.html">
|
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|
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|
|
Store Limits
|
|
|
|
</a>
|
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|
<ul class="articles">
|
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|
<li class="chapter " data-level="8.4.3.1" data-path="../../nats_streaming/configuring/storelimits.html">
|
|
|
|
<a href="../../nats_streaming/configuring/storelimits.html#limits-inheritance">
|
|
|
|
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|
Limits inheritance
|
|
|
|
</a>
|
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</li>
|
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|
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</ul>
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</li>
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|
<li class="chapter " data-level="8.4.4" data-path="../../nats_streaming/configuring/persistence.html">
|
|
|
|
<a href="../../nats_streaming/configuring/persistence.html">
|
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|
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Persistence
|
|
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|
</a>
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<ul class="articles">
|
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<li class="chapter " data-level="8.4.4.1" data-path="../../nats_streaming/configuring/filestore.html">
|
|
|
|
<a href="../../nats_streaming/configuring/filestore.html">
|
|
|
|
|
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File Store
|
|
|
|
</a>
|
|
|
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|
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<ul class="articles">
|
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|
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<li class="chapter " data-level="8.4.4.1.1" data-path="../../nats_streaming/configuring/filestore.html">
|
|
|
|
<a href="../../nats_streaming/configuring/filestore.html#options">
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Options
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<li class="chapter " data-level="8.4.4.1.2" data-path="../../nats_streaming/configuring/filestore.html">
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<a href="../../nats_streaming/configuring/filestore.html#recovery-errors">
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Recovery Errors
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</a>
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</li>
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<li class="chapter " data-level="8.4.4.2" data-path="../../nats_streaming/configuring/sqlstore.html">
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<a href="../../nats_streaming/configuring/sqlstore.html">
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SQL Store
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</a>
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<ul class="articles">
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<li class="chapter " data-level="8.4.4.2.1" data-path="../../nats_streaming/configuring/sqlstore.html">
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<a href="../../nats_streaming/configuring/sqlstore.html#read-and-write-timeouts">
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Read and Write Timeouts
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</a>
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<li class="chapter " data-level="8.4.4.2.2" data-path="../../nats_streaming/configuring/sqlstore.html">
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<a href="../../nats_streaming/configuring/sqlstore.html#options">
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Options
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</a>
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<li class="chapter " data-level="8.4.5" data-path="../../nats_streaming/configuring/tls.html">
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<a href="../../nats_streaming/configuring/tls.html">
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Securing
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</a>
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<ul class="articles">
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<li class="chapter " data-level="8.4.5.1" data-path="../../nats_streaming/configuring/tls.html">
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<a href="../../nats_streaming/configuring/tls.html#authenticating-users">
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Authenticating Users
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</a>
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</li>
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<li class="chapter " data-level="8.4.5.2" data-path="../../nats_streaming/configuring/tls.html">
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<a href="../../nats_streaming/configuring/tls.html#using-tls">
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TLS
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</a>
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</li>
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</ul>
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</ul>
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<li class="chapter " data-level="8.5" data-path="../../nats_streaming/gettingstarted/process-signaling.html">
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<a href="../../nats_streaming/gettingstarted/process-signaling.html">
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Process Signaling
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</a>
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</li>
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<li class="chapter " data-level="8.6" data-path="../../nats_streaming/gettingstarted/windows-service.html">
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<a href="../../nats_streaming/gettingstarted/windows-service.html">
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Windows Service
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</a>
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</li>
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<li class="chapter " data-level="8.7" data-path="../streaming/embedding.html">
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<a href="../streaming/embedding.html">
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Embedding NATS Streaming Server
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</a>
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</li>
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<li class="chapter " data-level="8.8" data-path="../../nats_streaming/swarm.html">
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<a href="../../nats_streaming/swarm.html">
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Docker Swarm
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</a>
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</li>
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<li class="header">NATS Protocol</li>
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<li class="chapter " data-level="9.1" data-path="../../nats_protocol/nats-protocol-demo.html">
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<a href="../../nats_protocol/nats-protocol-demo.html">
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Protocol Demo
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<li class="chapter " data-level="9.2" data-path="../../nats_protocol/nats-protocol.html">
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Client Protocol
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<a href="../../nats_protocol/nats-client-dev.html">
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Developing a Client
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</a>
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</li>
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<a href="../../nats_protocol/nats-server-protocol.html">
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NATS Cluster Protocol
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</a>
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href="../.." >Slow Consumers</a>
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<h1 id="slow-consumers"><a name="slow-consumers" class="plugin-anchor" href="#slow-consumers"><i class="fa fa-link" aria-hidden="true"></i></a>Slow Consumers</h1>
|
|
<p>NATS is designed to move messages through the server quickly. As a result, NATS depends on the applications to consider and respond to changing message rates. The server will do a bit of impedance matching, but if a client is too slow the server will eventually cut them off. These cut off connections are called <em>slow consumers</em>.</p>
|
|
<p>One way some of the libraries deal with bursty message traffic is to cache incoming messages for a subscription. So if an application can handle 10 messages per second and sometimes receives 20 messages per second, the library may hold the extra 10 to give the application time to catch up. To the server, the application will appear to be handling the messages and consider the connection healthy. It is up to the client library to decide what to do when the cache is too big, but most client libraries will drop incoming messages.</p>
|
|
<p>Receiving and dropping messages from the server keeps the connection to the server healthy, but creates an application requirement. There are several common patterns:</p>
|
|
<ul>
|
|
<li>Use request/reply to throttle the sender and prevent overloading the subscriber</li>
|
|
<li>Use a queue with multiple subscribers splitting the work</li>
|
|
<li>Persist messages with something like NATS streaming</li>
|
|
</ul>
|
|
<p>Libraries that cache incoming messages may provide two controls on the incoming queue, or pending messages. These are useful if the problem is bursty publishers and not a continuous performance mismatch. Disabling these limits can be dangerous in production and although setting these limits to 0 may help find problems, it is also a dangerous proposition in production.</p>
|
|
<blockquote>
|
|
<p>Check your libraries documentation for the default settings, and support for disabling these limits.</p>
|
|
</blockquote>
|
|
<p>The incoming cache is usually per subscriber, but again, check the specific documentation for your client library.</p>
|
|
<h2 id="limiting-incomingpending-messages-by-count-and-bytes"><a name="limiting-incomingpending-messages-by-count-and-bytes" class="plugin-anchor" href="#limiting-incomingpending-messages-by-count-and-bytes"><i class="fa fa-link" aria-hidden="true"></i></a>Limiting Incoming/Pending Messages by Count and Bytes</h2>
|
|
<p>The first way that the incoming queue can be limited is by message count. The second way to limit the incoming queue is by total size. For example, to limit the incoming cache to 1,000 messages or 5mb whichever comes first:</p>
|
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<div class="tab-wrap">
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<input type="radio" id="slow_pending_limits_go" name="slow_pending_limits" class="tab" checked>
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<label for="slow_pending_limits_go" class="api-lang" data-language="go">Go</label>
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<input type="radio" id="slow_pending_limits_java" name="slow_pending_limits" class="tab">
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<label for="slow_pending_limits_java" class="api-lang" data-language="java">Java</label>
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<input type="radio" id="slow_pending_limits_js" name="slow_pending_limits" class="tab">
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<label for="slow_pending_limits_js" class="api-lang" data-language="js">JavaScript</label>
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<input type="radio" id="slow_pending_limits_py" name="slow_pending_limits" class="tab">
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<label for="slow_pending_limits_py" class="api-lang" data-language="py">Python</label>
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<input type="radio" id="slow_pending_limits_ruby" name="slow_pending_limits" class="tab">
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<label for="slow_pending_limits_ruby" class="api-lang" data-language="ruby">Ruby</label>
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<input type="radio" id="slow_pending_limits_ts" name="slow_pending_limits" class="tab">
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<label for="slow_pending_limits_ts" class="api-lang" data-language="ts">TypeScript</label>
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<div class="tab__content">
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<pre id="slow_pending_limits_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/sub_pending_limits/main.go#L10-37"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-go">nc<span class="token punctuation">,</span> err <span class="token operator">:=</span> nats<span class="token punctuation">.</span><span class="token function">Connect</span><span class="token punctuation">(</span><span class="token string">"demo.nats.io"</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">defer</span> nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Subscribe</span>
|
|
sub1<span class="token punctuation">,</span> err <span class="token operator">:=</span> nc<span class="token punctuation">.</span><span class="token function">Subscribe</span><span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> <span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>nats<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token comment">// Set limits of 1000 messages or 5MB, whichever comes first</span>
|
|
sub1<span class="token punctuation">.</span><span class="token function">SetPendingLimits</span><span class="token punctuation">(</span><span class="token number">1000</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token operator">*</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">1024</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Subscribe</span>
|
|
sub2<span class="token punctuation">,</span> err <span class="token operator">:=</span> nc<span class="token punctuation">.</span><span class="token function">Subscribe</span><span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> <span class="token keyword">func</span><span class="token punctuation">(</span>m <span class="token operator">*</span>nats<span class="token punctuation">.</span>Msg<span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token comment">// Set no limits for this subscription</span>
|
|
sub2<span class="token punctuation">.</span><span class="token function">SetPendingLimits</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Close the connection</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="slow_pending_limits_java_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/java-nats-examples/blob/master/src/main/java/io/nats/examples/SetPendingLimits.java#L12-32"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-java"><span class="token class-name">Connection</span> nc <span class="token operator">=</span> <span class="token class-name">Nats</span><span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token class-name">Dispatcher</span> d <span class="token operator">=</span> nc<span class="token punctuation">.</span><span class="token function">createDispatcher</span><span class="token punctuation">(</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span> <span class="token operator">-></span> <span class="token punctuation">{</span>
|
|
<span class="token comment">// do something</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
d<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
d<span class="token punctuation">.</span><span class="token function">setPendingLimits</span><span class="token punctuation">(</span><span class="token number">1_000</span><span class="token punctuation">,</span> <span class="token number">5</span> <span class="token operator">*</span> <span class="token number">1024</span> <span class="token operator">*</span> <span class="token number">1024</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Set limits on a dispatcher</span>
|
|
|
|
<span class="token comment">// Subscribe</span>
|
|
<span class="token class-name">Subscription</span> sub <span class="token operator">=</span> nc<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
sub<span class="token punctuation">.</span><span class="token function">setPendingLimits</span><span class="token punctuation">(</span><span class="token number">1_000</span><span class="token punctuation">,</span> <span class="token number">5</span> <span class="token operator">*</span> <span class="token number">1024</span> <span class="token operator">*</span> <span class="token number">1024</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Set limits on a subscription</span>
|
|
|
|
<span class="token comment">// Do something</span>
|
|
|
|
<span class="token comment">// Close the connection</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="slow_pending_limits_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/options_samples.js#L107-109"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript"><span class="token comment">// slow pending limits are not configurable on node-nats</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="slow_pending_limits_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/sub_pending_limits.py#L6-20"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-python">nc <span class="token operator">=</span> NATS<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>connect<span class="token punctuation">(</span>servers<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
|
|
|
|
future <span class="token operator">=</span> asyncio<span class="token punctuation">.</span>Future<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">async</span> <span class="token keyword">def</span> <span class="token function">cb</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span><span class="token punctuation">:</span>
|
|
<span class="token keyword">nonlocal</span> future
|
|
future<span class="token punctuation">.</span>set_result<span class="token punctuation">(</span>msg<span class="token punctuation">)</span>
|
|
|
|
<span class="token comment"># Set limits of 1000 messages or 5MB</span>
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>subscribe<span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> cb<span class="token operator">=</span>cb<span class="token punctuation">,</span> pending_bytes_limit<span class="token operator">=</span><span class="token number">5</span><span class="token operator">*</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">1024</span><span class="token punctuation">,</span> pending_msgs_limit<span class="token operator">=</span><span class="token number">1000</span><span class="token punctuation">)</span>
|
|
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="slow_pending_limits_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/notapplicable.txt#L17-19"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-ruby"><span class="token comment"># The Ruby NATS client currently does not have option to customize slow consumer limits per sub.</span>
|
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</code></pre>
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</div>
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<div class="tab__content">
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<pre id="slow_pending_limits_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/options_samples.ts#L75-77"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript"><span class="token comment">// slow pending limits are not configurable on ts-nats</span>
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</code></pre>
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</div>
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</div>
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<h2 id="detect-a-slow-consumer-and-check-for-dropped-messages"><a name="detect-a-slow-consumer-and-check-for-dropped-messages" class="plugin-anchor" href="#detect-a-slow-consumer-and-check-for-dropped-messages"><i class="fa fa-link" aria-hidden="true"></i></a>Detect a Slow Consumer and Check for Dropped Messages</h2>
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<p>When a slow consumer is detected and messages are about to be dropped, the library may notify the application. This process may be similar to other errors or may involve a custom callback.</p>
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<p>Some libraries, like Java, will not send this notification on every dropped message because that could be noisy. Rather the notification may be sent once per time the subscriber gets behind. Libraries may also provide a way to get a count of dropped messages so that applications can at least detect a problem is occurring.</p>
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<div class="tab-wrap">
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<input type="radio" id="slow_listener_go" name="slow_listener" class="tab" checked>
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<label for="slow_listener_go" class="api-lang" data-language="go">Go</label>
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<input type="radio" id="slow_listener_java" name="slow_listener" class="tab">
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<label for="slow_listener_java" class="api-lang" data-language="java">Java</label>
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<input type="radio" id="slow_listener_js" name="slow_listener" class="tab">
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<label for="slow_listener_js" class="api-lang" data-language="js">JavaScript</label>
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<input type="radio" id="slow_listener_py" name="slow_listener" class="tab">
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<label for="slow_listener_py" class="api-lang" data-language="py">Python</label>
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<input type="radio" id="slow_listener_ruby" name="slow_listener" class="tab">
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<label for="slow_listener_ruby" class="api-lang" data-language="ruby">Ruby</label>
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<input type="radio" id="slow_listener_ts" name="slow_listener" class="tab">
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<label for="slow_listener_ts" class="api-lang" data-language="ts">TypeScript</label>
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<div class="tab__content">
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<pre id="slow_listener_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/slow_listener/main.go#L10-20"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-go"><span class="token comment">// Set the callback that will be invoked when an asynchronous error occurs.</span>
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nc<span class="token punctuation">,</span> err <span class="token operator">:=</span> nats<span class="token punctuation">.</span><span class="token function">Connect</span><span class="token punctuation">(</span><span class="token string">"demo.nats.io"</span><span class="token punctuation">,</span> nats<span class="token punctuation">.</span><span class="token function">ErrorHandler</span><span class="token punctuation">(</span>logSlowConsumer<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
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<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">defer</span> nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token comment">// Do something with the connection</span>
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</code></pre>
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</div>
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<div class="tab__content">
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<pre id="slow_listener_java_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/java-nats-examples/blob/master/src/main/java/io/nats/examples/SlowConsumerListener.java#L9-43"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-java"><span class="token keyword">class</span> <span class="token class-name">SlowConsumerReporter</span> <span class="token keyword">implements</span> <span class="token class-name">ErrorListener</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">errorOccurred</span><span class="token punctuation">(</span><span class="token class-name">Connection</span> conn<span class="token punctuation">,</span> <span class="token class-name">String</span> error<span class="token punctuation">)</span>
|
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<span class="token punctuation">{</span>
|
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">exceptionOccurred</span><span class="token punctuation">(</span><span class="token class-name">Connection</span> conn<span class="token punctuation">,</span> <span class="token class-name">Exception</span> exp<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token comment">// Detect slow consumers</span>
|
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">slowConsumerDetected</span><span class="token punctuation">(</span><span class="token class-name">Connection</span> conn<span class="token punctuation">,</span> <span class="token class-name">Consumer</span> consumer<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token comment">// Get the dropped count</span>
|
|
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"A slow consumer dropped messages: "</span><span class="token operator">+</span> consumer<span class="token punctuation">.</span><span class="token function">getDroppedCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
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<span class="token punctuation">}</span>
|
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|
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SlowConsumerListener</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
|
|
<span class="token class-name">Options</span> options <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Options</span><span class="token punctuation">.</span><span class="token class-name">Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>
|
|
<span class="token function">server</span><span class="token punctuation">(</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>
|
|
<span class="token function">errorListener</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">SlowConsumerReporter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span> <span class="token comment">// Set the listener</span>
|
|
<span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token class-name">Connection</span> nc <span class="token operator">=</span> <span class="token class-name">Nats</span><span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span>options<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Do something with the connection</span>
|
|
|
|
nc<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
</code></pre>
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</div>
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<div class="tab__content">
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<pre id="slow_listener_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/options_samples.js#L114-116"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript"><span class="token comment">// slow consumer detection is not configurable on node-nats</span>
|
|
</code></pre>
|
|
</div>
|
|
|
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<div class="tab__content">
|
|
<pre id="slow_listener_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/slow_listener.py#L7-50"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-python">
|
|
nc <span class="token operator">=</span> NATS<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">async</span> <span class="token keyword">def</span> <span class="token function">error_cb</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">:</span>
|
|
<span class="token keyword">if</span> <span class="token builtin">type</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token keyword">is</span> nats<span class="token punctuation">.</span>aio<span class="token punctuation">.</span>errors<span class="token punctuation">.</span>ErrSlowConsumer<span class="token punctuation">:</span>
|
|
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">"Slow consumer error, unsubscribing from handling further messages..."</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>unsubscribe<span class="token punctuation">(</span>e<span class="token punctuation">.</span>sid<span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>connect<span class="token punctuation">(</span>
|
|
servers<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
|
|
error_cb<span class="token operator">=</span>error_cb<span class="token punctuation">,</span>
|
|
<span class="token punctuation">)</span>
|
|
|
|
msgs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
|
|
future <span class="token operator">=</span> asyncio<span class="token punctuation">.</span>Future<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">async</span> <span class="token keyword">def</span> <span class="token function">cb</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span><span class="token punctuation">:</span>
|
|
<span class="token keyword">nonlocal</span> msgs
|
|
<span class="token keyword">nonlocal</span> future
|
|
<span class="token keyword">print</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span>
|
|
msgs<span class="token punctuation">.</span>append<span class="token punctuation">(</span>msg<span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">if</span> <span class="token builtin">len</span><span class="token punctuation">(</span>msgs<span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">3</span><span class="token punctuation">:</span>
|
|
<span class="token comment"># Head of line blocking on other messages caused</span>
|
|
<span class="token comment"># by single message proccesing taking long...</span>
|
|
<span class="token keyword">await</span> asyncio<span class="token punctuation">.</span>sleep<span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>subscribe<span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> cb<span class="token operator">=</span>cb<span class="token punctuation">,</span> pending_msgs_limit<span class="token operator">=</span><span class="token number">5</span><span class="token punctuation">)</span>
|
|
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|
<span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>publish<span class="token punctuation">(</span><span class="token string">"updates"</span><span class="token punctuation">,</span> <span class="token string">"msg #{}"</span><span class="token punctuation">.</span><span class="token builtin">format</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">.</span>encode<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">await</span> asyncio<span class="token punctuation">.</span>sleep<span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">try</span><span class="token punctuation">:</span>
|
|
<span class="token keyword">await</span> asyncio<span class="token punctuation">.</span>wait_for<span class="token punctuation">(</span>future<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">except</span> asyncio<span class="token punctuation">.</span>TimeoutError<span class="token punctuation">:</span>
|
|
<span class="token keyword">pass</span>
|
|
|
|
<span class="token keyword">for</span> msg <span class="token keyword">in</span> msgs<span class="token punctuation">:</span>
|
|
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">"[Received]"</span><span class="token punctuation">,</span> msg<span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
</code></pre>
|
|
</div>
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<div class="tab__content">
|
|
<pre id="slow_listener_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/notapplicable.txt#L21-23"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-ruby"><span class="token comment"># The Ruby NATS client currently does not have option to customize slow consumer limits per sub.</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
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<pre id="slow_listener_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/options_samples.ts#L82-84"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript"><span class="token comment">// slow consumer detection is not configurable on ts-nats</span>
|
|
</code></pre>
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</div>
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|
|
})();
|
|
}
|
|
|
|
function copyToClipboard(text, el) {
|
|
var copyTest = document.queryCommandSupported('copy');
|
|
var elOriginalText = el.getAttribute('data-original-title');
|
|
|
|
if (copyTest === true) {
|
|
var copyTextArea = document.createElement("textarea");
|
|
copyTextArea.value = text;
|
|
document.body.appendChild(copyTextArea);
|
|
copyTextArea.select();
|
|
try {
|
|
var successful = document.execCommand('copy');
|
|
var msg = successful ? 'Copied!' : 'Whoops, not copied!';
|
|
var parent = el.parentNode.parentNode;
|
|
var msgElem = parent.querySelector(".copy-msg");
|
|
flash(msgElem, msg, 100);
|
|
} catch (err) {
|
|
console.log('Oops, unable to copy', err);
|
|
}
|
|
document.body.removeChild(copyTextArea);
|
|
el.setAttribute('data-original-title', elOriginalText);
|
|
} else {
|
|
// Fallback if browser doesn't support .execCommand('copy')
|
|
window.prompt("Copy to clipboard: Ctrl+C or Command+C, Enter", text);
|
|
}
|
|
}
|
|
|
|
function processGraphVizSections(elements) {
|
|
var elements = document.querySelectorAll("[data-viz]");
|
|
var viz = new Viz();
|
|
Array.prototype.forEach.call(elements, function (x) {
|
|
var engine = x.getAttribute("data-viz");
|
|
var image = viz.renderImageElement(x.innerText, {
|
|
format: "png",
|
|
engine: engine
|
|
}).then(function (element) {
|
|
x.parentNode.insertBefore(element, x);
|
|
});
|
|
});
|
|
|
|
|
|
};
|
|
|
|
function updateLanguageParameter(value) {
|
|
const param = "lang";
|
|
|
|
if (window.location.href.indexOf("?") >= 0) {
|
|
const regExp = new RegExp(param + "(.+?)(&|$)", "g");
|
|
const newUrl = window.location.href.replace(regExp, param + "=" + encodeURIComponent(value) + "$2");
|
|
window.history.pushState("", "", newUrl);
|
|
} else {
|
|
const newUrl = window.location.href + "?" + param + "=" + encodeURIComponent(value);
|
|
window.history.pushState("", "", newUrl);
|
|
}
|
|
}
|
|
|
|
function getLanguageParameter() {
|
|
var match = RegExp('[?&]lang=([^&]*)').exec(window.location.search);
|
|
return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
|
|
}
|
|
|
|
function docReady() {
|
|
window.gitbook.events.bind("page.change", function () {
|
|
pageChanged();
|
|
});
|
|
|
|
var searchInput = document.querySelector('#book-search-input input');
|
|
|
|
if (searchInput) {
|
|
searchInput.addEventListener('keyup', function(event) {
|
|
if (event.keyCode === 13) {
|
|
event.target.blur();
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
function pageChanged() {
|
|
var logos = document.querySelectorAll(".nats");
|
|
if (logos && logos.length == 0) {
|
|
gitbook.toolbar.createButton({
|
|
icon: 'nats',
|
|
label: 'NATS Home Page',
|
|
position: 'right',
|
|
onClick: function () {
|
|
var win = window.open("https://nats.io/", '_blank');
|
|
win.focus();
|
|
}
|
|
});
|
|
}
|
|
|
|
document.querySelectorAll('.js-copy').forEach(elem => {
|
|
elem.addEventListener("click", function () {
|
|
var el = this;
|
|
var parent = this.parentNode.parentNode;
|
|
var code = parent.querySelector('code');
|
|
var text = code.textContent || code.innerText;
|
|
copyToClipboard(text, el);
|
|
})
|
|
});
|
|
|
|
document.querySelectorAll('.api-lang').forEach(elem => {
|
|
elem.addEventListener("click", function () {
|
|
var curLang = sessionStorage.getItem('nats-api-language');
|
|
var lang = this.getAttribute('data-language');
|
|
|
|
// Stop the infinite loop
|
|
if (curLang == lang) {
|
|
return;
|
|
}
|
|
|
|
sessionStorage.setItem('nats-api-language', lang); // So we only do this 1x
|
|
|
|
updateLanguageParameter(lang)
|
|
|
|
document.querySelectorAll('.api-lang[data-language=' + lang + ']').forEach(elem => {
|
|
elem.click();
|
|
});
|
|
})
|
|
});
|
|
|
|
if (sessionStorage) {
|
|
var curLang = sessionStorage.getItem('nats-api-language');
|
|
var queryLang = getLanguageParameter();
|
|
var lang = curLang;
|
|
|
|
if (queryLang) { // query takes precedent
|
|
lang = queryLang
|
|
}
|
|
|
|
if (lang) {
|
|
document.querySelectorAll('.api-lang[data-language=' + lang + ']').forEach(elem => {
|
|
elem.click();
|
|
});
|
|
}
|
|
}
|
|
|
|
setTimeout(function () {
|
|
processGraphVizSections();
|
|
}, 1);
|
|
}
|
|
|
|
|
|
if (document.readyState != 'loading') docReady();
|
|
else if (document.addEventListener) document.addEventListener('DOMContentLoaded', docReady);
|
|
else document.attachEvent('onreadystatechange', function () {
|
|
if (document.readyState == 'complete') docReady();
|
|
});
|
|
</script>
|
|
|
|
<!-- Github Buttons -->
|
|
<script async defer src="https://buttons.github.io/buttons.js"></script>
|
|
|
|
<!-- Styles -->
|
|
<style>
|
|
.nats {
|
|
display: inline-block;
|
|
width: 16px;
|
|
height: 16px;
|
|
background: url(https://nats.io/img/nats-icon-color.svg);
|
|
background-size: 16px 16px;
|
|
background-repeat: no-repeat;
|
|
}
|
|
|
|
div.graphviz {
|
|
background: transparent;
|
|
border: 0;
|
|
padding-top: 15px;
|
|
padding-right: 15px;
|
|
padding-bottom: 25px;
|
|
padding-left: 15px;
|
|
text-align: center;
|
|
}
|
|
|
|
code[data-viz] {
|
|
display: none;
|
|
}
|
|
|
|
.tab-wrap {
|
|
transition: 0.3s box-shadow ease;
|
|
border-radius: 6px;
|
|
max-width: 100%;
|
|
display: flex;
|
|
flex-wrap: wrap;
|
|
position: relative;
|
|
list-style: none;
|
|
background-color: #fff;
|
|
margin: 20px 0;
|
|
/* box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);*/
|
|
}
|
|
|
|
.tab-wrap:hover {
|
|
box-shadow: 0 12px 23px rgba(0, 0, 0, 0.23), 0 10px 10px rgba(0, 0, 0, 0.19);
|
|
}
|
|
|
|
.tab {
|
|
display: none;
|
|
}
|
|
|
|
/* Using scss these would be generated, we have to manually create enough for all tabs, start with 8 */
|
|
.tab:checked:nth-of-type(1)~.tab__content:nth-of-type(1) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(2)~.tab__content:nth-of-type(2) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(3)~.tab__content:nth-of-type(3) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(4)~.tab__content:nth-of-type(4) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(5)~.tab__content:nth-of-type(5) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(6)~.tab__content:nth-of-type(6) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(7)~.tab__content:nth-of-type(7) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(8)~.tab__content:nth-of-type(8) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:first-of-type:not(:last-of-type)+label {
|
|
border-top-right-radius: 0;
|
|
border-bottom-right-radius: 0;
|
|
}
|
|
|
|
.tab:not(:first-of-type):not(:last-of-type)+label {
|
|
border-radius: 0;
|
|
}
|
|
|
|
.tab:last-of-type:not(:first-of-type)+label {
|
|
border-top-left-radius: 0;
|
|
border-bottom-left-radius: 0;
|
|
}
|
|
|
|
.tab:checked+label {
|
|
background-color: #fff;
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
cursor: default;
|
|
font-weight: bold;
|
|
border: 1px solid #ddd;
|
|
border-bottom-color: transparent;
|
|
}
|
|
|
|
.tab:checked+label:hover {
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
background-color: #fff;
|
|
}
|
|
|
|
.tab+label {
|
|
box-shadow: 0 -1px 0 #eee inset;
|
|
border-radius: 6px 6px 0 0;
|
|
cursor: pointer;
|
|
display: block;
|
|
text-decoration: none;
|
|
color: #27aae1;
|
|
flex-grow: 3;
|
|
text-align: center;
|
|
-webkit-user-select: none;
|
|
-moz-user-select: none;
|
|
-ms-user-select: none;
|
|
user-select: none;
|
|
text-align: center;
|
|
transition: 0.3s background-color ease, 0.3s box-shadow ease;
|
|
height: 50px;
|
|
box-sizing: border-box;
|
|
padding: 15px;
|
|
}
|
|
|
|
.tab+label:hover {
|
|
background-color: #f9f9f9;
|
|
box-shadow: 0 1px 0 #f4f4f4 inset;
|
|
}
|
|
|
|
.tab__content {
|
|
padding: 2px 2px;
|
|
background-color: transparent;
|
|
position: absolute;
|
|
width: 100%;
|
|
z-index: -1;
|
|
opacity: 0;
|
|
left: 0;
|
|
-webkit-transform: translateY(-3px);
|
|
transform: translateY(-3px);
|
|
border-radius: 6px;
|
|
}
|
|
|
|
.tab__content pre {
|
|
margin-bottom: 0px !important;
|
|
}
|
|
|
|
.toolbar-icons {
|
|
display: inline-block;
|
|
position: relative;
|
|
padding-left: 4px;
|
|
}
|
|
|
|
a.toolbar-icons {
|
|
text-decoration: none;
|
|
}
|
|
|
|
.toolbar-icons .mdi {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.copy-msg {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.pull-right {
|
|
float: right !important;
|
|
}
|
|
|
|
.pull-left {
|
|
float: left !important;
|
|
}
|
|
</style>
|
|
<!-- Global site tag (gtag.js) - Google Analytics -->
|
|
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-111730698-1"></script>
|
|
<script>
|
|
window.dataLayer = window.dataLayer || [];
|
|
function gtag(){dataLayer.push(arguments);}
|
|
gtag('js', new Date());
|
|
|
|
gtag('config', 'UA-111730698-1');
|
|
</script>
|
|
|
|
|
|
<script src="../../gitbook/gitbook.js"></script>
|
|
<script src="../../gitbook/theme.js"></script>
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-toggle-chapters/toggle.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-edit-link/plugin.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search-engine.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|