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<title>Slow Consumers ยท NATS</title>
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<li class="chapter " data-level="1.1" data-path="../">
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Introduction
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What's New in 2.0
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<li class="header">Concepts</li>
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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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</a>
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Queue Groups
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</a>
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<a href="../developer/concepts/acks.html">
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Acknowledgements
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</a>
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<li class="chapter " data-level="2.7" data-path="../developer/concepts/seq_num.html">
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<a href="../developer/concepts/seq_num.html">
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Sequence Numbers
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</a>
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<li class="header">Developing With NATS</li>
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<li class="chapter " data-level="3.1" data-path="../developer/">
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<a href="../developer/">
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Introduction
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</a>
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<li class="chapter " data-level="3.2" data-path="../developer/connecting/intro.html">
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<a href="../developer/connecting/intro.html">
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Connecting
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.2.1" data-path="../developer/connecting/default_server.html">
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<a href="../developer/connecting/default_server.html">
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Connecting to the Default Server
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</a>
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<li class="chapter " data-level="3.2.2" data-path="../developer/connecting/specific_server.html">
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<a href="../developer/connecting/specific_server.html">
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Connecting to a Specific Server
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</a>
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<li class="chapter " data-level="3.2.3" data-path="../developer/connecting/cluster.html">
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<a href="../developer/connecting/cluster.html">
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Connecting to a Cluster
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</a>
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</li>
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<li class="chapter " data-level="3.2.4" data-path="../developer/connecting/connect_timeout.html">
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<a href="../developer/connecting/connect_timeout.html">
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Setting a Connect Timeout
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</a>
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</li>
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<li class="chapter " data-level="3.2.5" data-path="../developer/connecting/pingpong.html">
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<a href="../developer/connecting/pingpong.html">
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Ping/Pong Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.2.6" data-path="../developer/connecting/protocol.html">
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<a href="../developer/connecting/protocol.html">
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Controlling the Client/Server Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.2.7" data-path="../developer/connecting/noecho.html">
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<a href="../developer/connecting/noecho.html">
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Turning Off Echo'd Messages
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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="3.3" data-path="../developer/reconnect/intro.html">
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<a href="../developer/reconnect/intro.html">
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Automatic Reconnections
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.3.1" data-path="../developer/reconnect/disable.html">
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<a href="../developer/reconnect/disable.html">
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Disabling Reconnect
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</a>
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</li>
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<li class="chapter " data-level="3.3.2" data-path="../developer/reconnect/max.html">
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<a href="../developer/reconnect/max.html">
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Set the Number of Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.3" data-path="../developer/reconnect/wait.html">
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<a href="../developer/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="../developer/reconnect/random.html">
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<a href="../developer/reconnect/random.html">
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Avoiding the Thundering Herd
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</a>
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</li>
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<li class="chapter " data-level="3.3.5" data-path="../developer/reconnect/events.html">
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<a href="../developer/reconnect/events.html">
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Listening for Reconnect Events
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</a>
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</li>
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<li class="chapter " data-level="3.3.6" data-path="../developer/reconnect/buffer.html">
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<a href="../developer/reconnect/buffer.html">
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Buffering Messages During Reconnect Attempts
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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="3.4" data-path="../developer/security/intro.html">
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<a href="../developer/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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<li class="chapter " data-level="3.4.1" data-path="../developer/security/userpass.html">
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<a href="../developer/security/userpass.html">
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Authenticating with a User and Password
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</a>
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</li>
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<li class="chapter " data-level="3.4.2" data-path="../developer/security/token.html">
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<a href="../developer/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="../developer/security/nkey.html">
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<a href="../developer/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="../developer/security/creds.html">
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<a href="../developer/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="../developer/security/tls.html">
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<a href="../developer/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="../developer/receiving/intro.html">
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<a href="../developer/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="../developer/receiving/sync.html">
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<a href="../developer/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="../developer/receiving/async.html">
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<a href="../developer/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="../developer/receiving/unsubscribing.html">
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<a href="../developer/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="../developer/receiving/unsub_after.html">
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<a href="../developer/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="../developer/receiving/reply.html">
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<a href="../developer/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="../developer/receiving/wildcards.html">
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<a href="../developer/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="../developer/receiving/queues.html">
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<a href="../developer/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="../developer/receiving/drain.html">
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<a href="../developer/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="../developer/receiving/structure.html">
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<a href="../developer/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="../developer/sending/intro.html">
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<a href="../developer/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="../developer/sending/replyto.html">
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<a href="../developer/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="../developer/sending/request_reply.html">
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<a href="../developer/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="../developer/sending/caches.html">
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<a href="../developer/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="../developer/sending/structure.html">
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<a href="../developer/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="../developer/events/intro.html">
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<a href="../developer/events/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="../developer/events/events.html">
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<a href="../developer/events/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 " data-level="3.7.2" data-path="../developer/events/slow.html">
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<a href="../developer/events/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="../developer/tutorials/intro.html">
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<a href="../developer/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="../developer/tutorials/pubsub.html">
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<a href="../developer/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="../developer/tutorials/reqreply.html">
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<a href="../developer/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="../developer/tutorials/queues.html">
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<a href="../developer/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="../developer/tutorials/custom_dialer.html">
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<a href="../developer/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">
|
|
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|
<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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|
|
|
Flags
|
|
|
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</a>
|
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|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5" data-path="../nats_server/configuration.html">
|
|
|
|
<a href="../nats_server/configuration.html">
|
|
|
|
|
|
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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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2" data-path="../nats_server/auth_intro.html">
|
|
|
|
<a href="../nats_server/auth_intro.html">
|
|
|
|
|
|
Authentication
|
|
|
|
</a>
|
|
|
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|
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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
|
|
|
|
</a>
|
|
|
|
|
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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>
|
|
|
|
|
|
|
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</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>
|
|
|
|
|
|
|
|
</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="./">
|
|
|
|
<a href="./">
|
|
|
|
|
|
Managing A NATS Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.1" data-path="upgrading_cluster.html">
|
|
|
|
<a href="upgrading_cluster.html">
|
|
|
|
|
|
Upgrading a Cluster
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter active" data-level="4.6.2" data-path="slow_consumers.html">
|
|
|
|
<a href="slow_consumers.html">
|
|
|
|
|
|
Slow Consumers
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.3" data-path="signals.html">
|
|
|
|
<a href="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/tutorial.html">
|
|
|
|
<a href="../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>
|
|
|
|
|
|
|
|
|
|
<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>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4" data-path="../nats_tools/nas/">
|
|
|
|
<a href="../nats_tools/nas/">
|
|
|
|
|
|
nats-account-server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.4.1" data-path="../nats_tools/nas/nas_conf.html">
|
|
|
|
<a href="../nats_tools/nas/nas_conf.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.2" data-path="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
<a href="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
|
|
Inspecting JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
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<li class="chapter " data-level="5.4.3" 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/tutorial.html">
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<a href="../nats_tools/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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<ul class="articles">
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<li class="chapter " data-level="6.1.1" 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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</ul>
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</li>
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<li class="chapter " data-level="6.2" 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="6.3" 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="6.3.1" 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="6.3.2" 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="6.3.2.1" 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="6.3.2.2" 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="6.3.2.3" 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="6.3.2.4" 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="6.4" data-path="../nats_streaming/store-interface.html">
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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="6.5" 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="6.6" data-path="../nats_streaming/clustering/clustering.html">
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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="6.6.1" 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="6.6.2" 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="6.6.3" data-path="../nats_streaming/clustering/auto-configuration.html">
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<a href="../nats_streaming/clustering/auto-configuration.html">
|
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Auto Configuration
|
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</a>
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</li>
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<li class="chapter " data-level="6.6.4" 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="6.7" data-path="../nats_streaming/fault-tolerance/ft.html">
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<a href="../nats_streaming/fault-tolerance/ft.html">
|
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Fault Tolerance
|
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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/fault-tolerance/active-server.html">
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<a href="../nats_streaming/fault-tolerance/active-server.html">
|
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Active Server
|
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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/fault-tolerance/standby-server.html">
|
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<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="6.7.3" data-path="../nats_streaming/fault-tolerance/shared-state.html">
|
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<a href="../nats_streaming/fault-tolerance/shared-state.html">
|
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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="6.7.4" data-path="../nats_streaming/fault-tolerance/failover.html">
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<a href="../nats_streaming/fault-tolerance/failover.html">
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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="6.8" data-path="../nats_streaming/partitioning.html">
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<a href="../nats_streaming/partitioning.html">
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Partitioning
|
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</a>
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</li>
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<li class="header">Developing With NATS Streaming</li>
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<li class="chapter " data-level="7.1" data-path="../developer/streaming/">
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<a href="../developer/streaming/">
|
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Introduction
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</a>
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</li>
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<li class="chapter " data-level="7.2" data-path="../developer/streaming/connecting.html">
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<a href="../developer/streaming/connecting.html">
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Connecting to NATS Streaming
|
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</a>
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</li>
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<li class="chapter " data-level="7.3" data-path="../developer/streaming/publishing.html">
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<a href="../developer/streaming/publishing.html">
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|
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Publishing to a Channel
|
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</a>
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</li>
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<li class="chapter " data-level="7.4" data-path="../developer/streaming/receiving.html">
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<a href="../developer/streaming/receiving.html">
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Receiving Messages from a Channel
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</a>
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</li>
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<li class="chapter " data-level="7.5" data-path="../developer/streaming/durables.html">
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<a href="../developer/streaming/durables.html">
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Durable Subscriptions
|
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</a>
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</li>
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<li class="chapter " data-level="7.6" data-path="../developer/streaming/queues.html">
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<a href="../developer/streaming/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="7.7" data-path="../developer/streaming/acks.html">
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<a href="../developer/streaming/acks.html">
|
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Acknowledgements
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</a>
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</li>
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<li class="chapter " data-level="7.8" data-path="../developer/streaming/protocol.html">
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<a href="../developer/streaming/protocol.html">
|
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The Streaming Protocol
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</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/install.html">
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<a href="../nats_streaming/gettingstarted/install.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="8.2" data-path="../nats_streaming/gettingstarted/run.html">
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<a href="../nats_streaming/gettingstarted/run.html">
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Running
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</a>
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</li>
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<li class="chapter " data-level="8.3" data-path="../nats_streaming/gettingstarted/configuring.html">
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<a href="../nats_streaming/gettingstarted/configuring.html">
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Configuring
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</a>
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</li>
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<li class="chapter " data-level="8.4" data-path="../nats_streaming/gettingstarted/tls.html">
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<a href="../nats_streaming/gettingstarted/tls.html">
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Securing
|
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</a>
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</li>
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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="../developer/streaming/embedding.html">
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<a href="../developer/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="chapter " data-level="8.9" data-path="../nats_streaming/monitoring/monitoring.html">
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<a href="../nats_streaming/monitoring/monitoring.html">
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Monitoring
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</a>
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<ul class="articles">
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<li class="chapter " data-level="8.9.1" data-path="../nats_streaming/monitoring/enabling.html">
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<a href="../nats_streaming/monitoring/enabling.html">
|
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Enabling
|
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</a>
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</li>
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<li class="chapter " data-level="8.9.2" 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">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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</a>
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</li>
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<li class="chapter " data-level="9.2" data-path="../nats_protocol/nats-protocol.html">
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<a href="../nats_protocol/nats-protocol.html">
|
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Client Protocol
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</a>
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<ul class="articles">
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<li class="chapter " data-level="9.2.1" data-path="../nats_protocol/nats-client-dev.html">
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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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</ul>
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</li>
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<li class="chapter " data-level="9.3" data-path="../nats_protocol/nats-server-protocol.html">
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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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</li>
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<li class="divider"></li>
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<li>
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
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Published with GitBook
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<a href=".." >Slow Consumers</a>
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<h2 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</h2>
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<p>To support resiliency and high availability, NATS provides built-in mechanisms to automatically prune the registered listener interest graph that is used to keep track of subscribers, including slow consumers and lazy listeners. NATS automatically handles a slow consumer. If a client is not processing messages quick enough, the NATS server cuts it off. To support scaling, NATS provides for auto-pruning of client connections. If a subscriber does not respond to ping requests from the server within the <a href="../nats-protocol/nats-protocol.md#PINGPONG">ping-pong interval</a>, the client is cut off (disconnected). The client will need to have reconnect logic to reconnect with the server.</p>
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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>
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<p>In core NATS, consumers that cannot keep up are handled differently from many other messaging systems: NATS favors the approach of protecting the system as a whole over accommodating a particular consumer to ensure message delivery.</p>
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<p><strong>What is a slow consumer?</strong></p>
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<p>A slow consumer is a subscriber that cannot keep up with the message flow delivered from the NATS server. This is a common case in distributed systems because it is often easier to generate data than it is to process it. When consumers cannot process data fast enough, back pressure is applied to the rest of the system. NATS has mechanisms to reduce this back pressure.</p>
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<p>NATS identifies slow consumers in the client or the server, providing notification through registered callbacks, log messages, and statistics in the server's monitoring endpoints.</p>
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<p><strong>What happens to slow consumers?</strong></p>
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<p>When detected at the client, the application is notified and messages are dropped to allow the consumer to continue and reduce potential back pressure. When detected in the server, the server will disconnect the connection with the slow consumer to protect itself and the integrity of the messaging system.</p>
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<h2 id="slow-consumers-identified-in-the-client"><a name="slow-consumers-identified-in-the-client" class="plugin-anchor" href="#slow-consumers-identified-in-the-client"><i class="fa fa-link" aria-hidden="true"></i></a>Slow consumers identified in the client</h2>
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<p>A <a href="../developer/events/slow.html">client can detect it is a slow consumer</a> on a local connection and notify the application through use of the asynchronous error callback. It is better to catch a slow consumer locally in the client rather than to allow the server to detect this condition. This example demonstrates how to define and register an asynchronous error handler that will handle slow consumer errors.</p>
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<pre class="language-"><code class="lang-go"><span class="token keyword">func</span> <span class="token function">natsErrHandler</span><span class="token punctuation">(</span>nc <span class="token operator">*</span>nats<span class="token punctuation">.</span>Conn<span class="token punctuation">,</span> sub <span class="token operator">*</span>nats<span class="token punctuation">.</span>Subscription<span class="token punctuation">,</span> natsErr <span class="token builtin">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"error: %v\n"</span><span class="token punctuation">,</span> natsErr<span class="token punctuation">)</span>
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<span class="token keyword">if</span> natsErr <span class="token operator">==</span> nats<span class="token punctuation">.</span>ErrSlowConsumer <span class="token punctuation">{</span>
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pendingMsgs<span class="token punctuation">,</span> <span class="token boolean">_</span><span class="token punctuation">,</span> err <span class="token operator">:=</span> sub<span class="token punctuation">.</span><span class="token function">Pending</span><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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fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"couldn't get pending messages: %v"</span><span class="token punctuation">,</span> err<span class="token punctuation">)</span>
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<span class="token keyword">return</span>
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<span class="token punctuation">}</span>
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fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"Falling behind with %d pending messages on subject %q.\n"</span><span class="token punctuation">,</span>
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pendingMsgs<span class="token punctuation">,</span> sub<span class="token punctuation">.</span>Subject<span class="token punctuation">)</span>
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<span class="token comment">// Log error, notify operations...</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// check for other errors</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// Set the error handler when creating a connection.</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">"nats://localhost:4222"</span><span class="token punctuation">,</span>
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nats<span class="token punctuation">.</span><span class="token function">ErrorHandler</span><span class="token punctuation">(</span>natsErrHandler<span class="token punctuation">)</span><span class="token punctuation">)</span>
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</code></pre>
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<p>With this example code and default settings, a slow consumer error would generate output something like this:</p>
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<pre class="language-"><code class="lang-sh">error: nats: slow consumer, messages dropped
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Falling behind with 65536 pending messages on subject <span class="token string">"foo"</span><span class="token keyword">.</span>
|
|
</code></pre>
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<p>Note that if you are using a synchronous subscriber, <code>Subscription.NextMsg(timeout time.Duration)</code> will also return an error indicating there was a slow consumer and messages have been dropped.</p>
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<h2 id="slow-consumers-identified-by-the-server"><a name="slow-consumers-identified-by-the-server" class="plugin-anchor" href="#slow-consumers-identified-by-the-server"><i class="fa fa-link" aria-hidden="true"></i></a>Slow consumers identified by the server</h2>
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<p>When a client does not process messages fast enough, the server will buffer messages in the outbound connection to the client. When this happens and the server cannot write data fast enough to the client, in order to protect itself, it will designate a subscriber as a "slow consumer" and may drop the associated connection.</p>
|
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<p>When the server initiates a slow consumer error, you'll see the following in the server output:</p>
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|
<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>54083<span class="token punctuation">]</span> 2017/09/28 14:45:18.001357 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> ::1:63283 - cid:7 - Slow Consumer Detected
|
|
</code></pre>
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<p>The server will also keep count of the number of slow consumer errors encountered, available through the monitoring <code>varz</code> endpoint in the <code>slow_consumers</code> field.</p>
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<h2 id="handling-slow-consumers"><a name="handling-slow-consumers" class="plugin-anchor" href="#handling-slow-consumers"><i class="fa fa-link" aria-hidden="true"></i></a>Handling slow consumers</h2>
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<p>Apart from using <a href="nats_streaming/intro.md">NATS streaming</a> or optimizing your consuming application, there are a few options available: scale, meter, or tune NATS to your environment.</p>
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<p><strong>Scaling with queue subscribers</strong></p>
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|
<p>This is ideal if you do not rely on message order. Ensure your NATS subscription belongs to a <a href="http://nats.io/documentation/concepts/nats-queueing/" target="_blank">queue group</a>, then scale as required by creating more instances of your service or application. This is a great approach for microservices - each instance of your microservice will receive a portion of the messages to process, and simply add more instances of your service to scale. No code changes, configuration changes, or downtime whatsoever.</p>
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|
<p><strong>Create a subject namespace that can scale</strong></p>
|
|
<p>You can distribute work further through the subject namespace, with some forethought in design. This approach is useful if you need to preserve message order. The general idea is to publish to a deep subject namespace, and consume with wildcard subscriptions while giving yourself room to expand and distribute work in the future.</p>
|
|
<p>For a simple example, if you have a service that receives telemetry data from IoT devices located throughout a city, you can publish to a subject namespace like <code>Sensors.North</code>, <code>Sensors.South</code>, <code>Sensors.East</code> and <code>Sensors.West</code>. Initially, you'll subscribe to <code>Sensors.></code> to process everything in one consumer. As your enterprise grows and data rates exceed what one consumer can handle, you can replace your single consumer with four consuming applications to subscribe to each subject representing a smaller segment of your data. Note that your publishing applications remain untouched.</p>
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|
<p><strong>Meter the publisher</strong></p>
|
|
<p>A less favorable option may be to meter the publisher. There are several ways to do this varying from simply slowing down your publisher to a more complex approach periodically issuing a blocking request/reply to match subscriber rates.</p>
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|
<p><strong>Tune NATS through configuration</strong> </p>
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|
<p>The NATS server can be tuned to determine how much data can be buffered before a consumer is considered slow, and some officially supported clients allow buffer sizes to be adjusted. Decreasing buffer sizes will let you identify slow consumers more quickly. Increasing buffer sizes is not typically recommended unless you are handling temporary bursts of data. Often, increasing buffer capacity will only <em>postpone</em> slow consumer problems.</p>
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|
<h3 id="server-configuration"><a name="server-configuration" class="plugin-anchor" href="#server-configuration"><i class="fa fa-link" aria-hidden="true"></i></a>Server Configuration</h3>
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<p>The NATS server has a write deadline it uses to write to a connection. When this write deadline is exceeded, a client is considered to have a slow consumer. If you are encountering slow consumer errors in the server, you can increase the write deadline to buffer more data.</p>
|
|
<p>The <code>write_deadline</code> configuration option in the NATS server configuration file will tune this:</p>
|
|
<pre class="language-"><code class="lang-ascii">write_deadline: 2s
|
|
</code></pre>
|
|
<p> Tuning this parameter is ideal when you have bursts of data to accommodate. <strong><em>Be sure you are not just postponing a slow consumer error.</em></strong></p>
|
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<h3 id="client-configuration"><a name="client-configuration" class="plugin-anchor" href="#client-configuration"><i class="fa fa-link" aria-hidden="true"></i></a>Client Configuration</h3>
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<p>Most officially supported clients have an internal buffer of pending messages and will notify your application through an asynchronous error callback if a local subscription is not catching up. Receiving an error locally does not necessarily mean that the server will have identified a subscription as a slow consumer.</p>
|
|
<p>This buffer can be configured through setting the pending limits after a subscription has been created:</p>
|
|
<pre class="language-"><code class="lang-go"><span class="token keyword">if</span> err <span class="token operator">:=</span> sub<span class="token punctuation">.</span><span class="token function">SetPendingLimits</span><span class="token punctuation">(</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">500</span><span class="token punctuation">,</span> <span class="token number">1024</span><span class="token operator">*</span><span class="token number">5000</span><span class="token punctuation">)</span><span class="token punctuation">;</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">Fatalf</span><span class="token punctuation">(</span><span class="token string">"Unable to set pending limits: %v"</span><span class="token punctuation">,</span> err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
</code></pre>
|
|
<p>The default subscriber pending message limit is <code>65536</code>, and the default subscriber pending byte limit is <code>65536*1024</code></p>
|
|
<p>If the client reaches this internal limit, it will drop messages and continue to process new messages. This is aligned with NATS at most once delivery. It is up to your application to detect the missing messages and recover from this condition.</p>
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}
|
|
|
|
/* 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>
|
|
|
|
|
|
<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-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-sharing/buttons.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|