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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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Connecting to a Cluster
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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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Turning Off Echo'd Messages
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Automatic Reconnections
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Disabling Reconnect
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Set the Number of Reconnect Attempts
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Pausing Between Reconnect Attempts
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Avoiding the Thundering Herd
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Listening for Reconnect Events
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Buffering Messages During Reconnect Attempts
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Securing Connections
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Authenticating with a User and Password
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Authenticating with a Token
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Authenticating with an NKey
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Authenticating with a Credentials File
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Encrypting Connections with TLS
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Receiving Messages
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Synchronous Subscriptions
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Asynchronous Subscriptions
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Unsubscribing
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Unsubscribing After N Messages
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Replying to a Message
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Wildcard Subscriptions
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Queue Subscriptions
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Draining Messages Before Disconnect
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Structured Data
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Sending Messages
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Including a Reply Subject
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Request-Reply Semantics
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Caches, Flush and Ping
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Sending Structured Data
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Monitoring the Connection
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Listen for Connection Events
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Slow Consumers
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Tutorials
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Explore NATS Pub/Sub
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Explore NATS Request/Reply
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Explore NATS Queueing
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Advanced Connect and Custom Dialer in Go
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<li class="header">NATS Server</li>
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Installing
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Running
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Window Service
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Clients
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Flags
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Configuration
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Securing NATS
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Enabling TLS
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Authentication
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Tokens
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Username/Password
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TLS Authentication
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NKeys
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Accounts
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<a href="../../../nats_server/jwt_auth.html">
JWTs
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<a href="../../../nats_server/auth_timeout.html">
Authentication Timeout
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<li class="chapter " data-level="4.5.1.3" data-path="../../../nats_server/authorization.html">
<a href="../../../nats_server/authorization.html">
Authorization
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</ul>
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<li class="chapter " data-level="4.5.2" data-path="../../../nats_server/clustering.html">
<a href="../../../nats_server/clustering.html">
Clustering
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<a href="../../../nats_server/cluster_config.html">
Configuration
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<a href="../../../nats_server/cluster_tls.html">
TLS Authentication
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</ul>
</li>
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<a href="../../../gateways/">
Gateways
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<a href="../../../gateways/gateway.html">
Configuration
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<li class="chapter " data-level="4.5.4" data-path="../../../leafnodes/">
<a href="../../../leafnodes/">
Leaf Nodes
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<a href="../../../leafnodes/leafnode_conf.html">
Configuration
</a>
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</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>
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</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
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</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>
</li>
</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>
<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>
</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>
<li class="chapter " data-level="5.4.3" data-path="../../../nats_tools/nas/dir_store.html">
<a href="../../../nats_tools/nas/dir_store.html">
Directory Store
</a>
</li>
<li class="chapter " data-level="5.4.4" data-path="../../../nats_tools/nas/notifications.html">
<a href="../../../nats_tools/nas/notifications.html">
Update Notifications
</a>
</li>
<li class="chapter " data-level="5.4.5" data-path="../../../nats_tools/nas/mem_resolver.html">
<a href="../../../nats_tools/nas/mem_resolver.html">
Memory Resolver
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5.5" data-path="../../../nats_tools/nats_top/">
<a href="../../../nats_tools/nats_top/">
nats-top
</a>
<ul class="articles">
<li class="chapter " data-level="5.5.1" data-path="../../../nats_tools/nats_top/nats-top-tutorial.html">
<a href="../../../nats_tools/nats_top/nats-top-tutorial.html">
Tutorial
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5.6" data-path="../../../nats_tools/natsbench.html">
<a href="../../../nats_tools/natsbench.html">
nats-bench
</a>
</li>
<li class="header">NATS Streaming Concepts</li>
<li class="chapter " data-level="6.1" data-path="../../intro.html">
<a href="../../intro.html">
Introduction
</a>
</li>
<li class="chapter " data-level="6.2" data-path="../../relation-to-nats.html">
<a href="../../relation-to-nats.html">
Relation to NATS
</a>
</li>
<li class="chapter " data-level="6.3" data-path="../../client-connections.html">
<a href="../../client-connections.html">
Client Connections
</a>
</li>
<li class="chapter " data-level="6.4" data-path="../channels.html">
<a href="../channels.html">
Channels
</a>
<ul class="articles">
<li class="chapter " data-level="6.4.1" data-path="../message-log.html">
<a href="../message-log.html">
Message Log
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<h1 id="queue-group-in-nats-streaming"><a name="queue-group-in-nats-streaming" class="plugin-anchor" href="#queue-group-in-nats-streaming"><i class="fa fa-link" aria-hidden="true"></i></a>Queue Group in NATS Streaming</h1>
<p>When consumers want to consume from the same channel but each receive a different message, as opposed to all receiving the same messages, they need to create a queue subscription. When a queue group name is specified, the server will send each messages from the log to a single consumer in the group. The distribution of these messages is not specified, therefore applications should not rely on an expected delivery scheme.</p>
<p>After the first queue member is created, any other member joining the group will receive messages based on where the server is in the message log for that particular group. That means that the starting position given by joining members is ignored by the server.</p>
<p>When the last member of the group leaves (subscription unsubscribed/closed/or connection closed), the group is removed from the server. The next application creating a subscription with the same name will create a new group, starting at the start position given in the subscription request.</p>
<p>A queue subscription can also be durable. For that, the client needs to provide a queue and durable name. The behavior is, as you would expect, a combination of queue and durable subscription. Though unlike a durable subscription, the client ID is not part of the queue group name since the client ID must be unique, and would prevent more than one connection to participate in the queue group. The main difference between a queue subscription and a durable one, is that when the last member leaves the group, the state of the group will be maintained by the server. Later, when a member rejoins the group, the delivery will resume.</p>
<p><strong><em>Note: For a durable queue subscription, the last member to </em> unsubscribe <em> (not simply close) causes the group to be removed from the server.</em></strong></p>
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-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>
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