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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.kafka.clients.consumer</a></div>
<h1 title="Interface ConsumerPartitionAssignor" class="title">Interface ConsumerPartitionAssignor</h1>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Known Implementing Classes:</dt>
<dd><code>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</code>, <code>org.apache.kafka.clients.consumer.internals.AbstractStickyAssignor</code>, <code><a href="CooperativeStickyAssignor.html" title="class in org.apache.kafka.clients.consumer">CooperativeStickyAssignor</a></code>, <code><a href="RangeAssignor.html" title="class in org.apache.kafka.clients.consumer">RangeAssignor</a></code>, <code><a href="RoundRobinAssignor.html" title="class in org.apache.kafka.clients.consumer">RoundRobinAssignor</a></code>, <code><a href="StickyAssignor.html" title="class in org.apache.kafka.clients.consumer">StickyAssignor</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">ConsumerPartitionAssignor</span></div>
<div class="block">This interface is used to define custom partition assignment for use in
<a href="KafkaConsumer.html" title="class in org.apache.kafka.clients.consumer"><code>KafkaConsumer</code></a>. Members of the consumer group subscribe
to the topics they are interested in and forward their subscriptions to a Kafka broker serving
as the group coordinator. The coordinator selects one member to perform the group assignment and
propagates the subscriptions of all members to it. Then <a href="#assign(org.apache.kafka.common.Cluster,org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.GroupSubscription)"><code>assign(Cluster, GroupSubscription)</code></a> is called
to perform the assignment and the results are forwarded back to each respective members
<p>
In some cases, it is useful to forward additional metadata to the assignor in order to make
assignment decisions. For this, you can override <a href="#subscriptionUserData(java.util.Set)"><code>subscriptionUserData(Set)</code></a> and provide custom
userData in the returned Subscription. For example, to have a rack-aware assignor, an implementation
can use this user data to forward the rackId belonging to each member.
<p>
The implementation can extend <a href="../../common/Configurable.html" title="interface in org.apache.kafka.common"><code>Configurable</code></a> to get configs from consumer.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== NESTED CLASS SUMMARY ======== -->
<li>
<section class="nested-class-summary" id="nested-class-summary">
<h2>Nested Class Summary</h2>
<div class="caption"><span>Nested Classes</span></div>
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Interface</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>static final class&nbsp;</code></div>
<div class="col-second even-row-color"><code><a href="ConsumerPartitionAssignor.Assignment.html" class="type-name-link" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Assignment</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
<div class="col-first odd-row-color"><code>static final class&nbsp;</code></div>
<div class="col-second odd-row-color"><code><a href="ConsumerPartitionAssignor.GroupAssignment.html" class="type-name-link" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupAssignment</a></code></div>
<div class="col-last odd-row-color">&nbsp;</div>
<div class="col-first even-row-color"><code>static final class&nbsp;</code></div>
<div class="col-second even-row-color"><code><a href="ConsumerPartitionAssignor.GroupSubscription.html" class="type-name-link" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupSubscription</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
<div class="col-first odd-row-color"><code>static enum&nbsp;</code></div>
<div class="col-second odd-row-color"><code><a href="ConsumerPartitionAssignor.RebalanceProtocol.html" class="type-name-link" title="enum class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.RebalanceProtocol</a></code></div>
<div class="col-last odd-row-color">
<div class="block">The rebalance protocol defines partition assignment and revocation semantics.</div>
</div>
<div class="col-first even-row-color"><code>static final class&nbsp;</code></div>
<div class="col-second even-row-color"><code><a href="ConsumerPartitionAssignor.Subscription.html" class="type-name-link" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Subscription</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract Methods</button><button id="method-summary-table-tab5" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab5', 3)" class="table-tab">Default Methods</button></div>
<div id="method-summary-table.tabpanel" role="tabpanel">
<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="ConsumerPartitionAssignor.GroupAssignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupAssignment</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#assign(org.apache.kafka.common.Cluster,org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.GroupSubscription)" class="member-name-link">assign</a><wbr>(<a href="../../common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a>&nbsp;metadata,
<a href="ConsumerPartitionAssignor.GroupSubscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupSubscription</a>&nbsp;groupSubscription)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Perform the group assignment given the member subscriptions and current cluster metadata.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1"><code>static <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor</a>&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1"><code><a href="#getAssignorInstances(java.util.List,java.util.Map)" class="member-name-link">getAssignorInstances</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;assignorClasses,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;&nbsp;configs)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1">
<div class="block">Get a list of configured instances of <a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer"><code>ConsumerPartitionAssignor</code></a>
based on the class names/types specified by <a href="ConsumerConfig.html#PARTITION_ASSIGNMENT_STRATEGY_CONFIG"><code>ConsumerConfig.PARTITION_ASSIGNMENT_STRATEGY_CONFIG</code></a></div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#name()" class="member-name-link">name</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Unique name for this assignor (e.g.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code>default void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code><a href="#onAssignment(org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.Assignment,org.apache.kafka.clients.consumer.ConsumerGroupMetadata)" class="member-name-link">onAssignment</a><wbr>(<a href="ConsumerPartitionAssignor.Assignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Assignment</a>&nbsp;assignment,
<a href="ConsumerGroupMetadata.html" title="class in org.apache.kafka.clients.consumer">ConsumerGroupMetadata</a>&nbsp;metadata)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5">
<div class="block">Callback which is invoked when a group member receives its assignment from the leader.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code>default <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/nio/ByteBuffer.html" title="class or interface in java.nio" class="external-link">ByteBuffer</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code><a href="#subscriptionUserData(java.util.Set)" class="member-name-link">subscriptionUserData</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html" title="class or interface in java.util" class="external-link">Set</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;topics)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5">
<div class="block">Return serialized data that will be included in the <a href="ConsumerPartitionAssignor.Subscription.html" title="class in org.apache.kafka.clients.consumer"><code>ConsumerPartitionAssignor.Subscription</code></a> sent to the leader
and can be leveraged in <a href="#assign(org.apache.kafka.common.Cluster,org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.GroupSubscription)"><code>assign(Cluster, GroupSubscription)</code></a> ((e.g.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code>default <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="ConsumerPartitionAssignor.RebalanceProtocol.html" title="enum class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.RebalanceProtocol</a>&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code><a href="#supportedProtocols()" class="member-name-link">supportedProtocols</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5">
<div class="block">Indicate which rebalance protocol this assignor works with;
By default it should always work with <a href="ConsumerPartitionAssignor.RebalanceProtocol.html#EAGER"><code>ConsumerPartitionAssignor.RebalanceProtocol.EAGER</code></a>.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code>default short</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code><a href="#version()" class="member-name-link">version</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5">
<div class="block">Return the version of the assignor which indicates how the user metadata encodings
and the assignment algorithm gets evolved.</div>
</div>
</div>
</div>
</div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="subscriptionUserData(java.util.Set)">
<h3>subscriptionUserData</h3>
<div class="member-signature"><span class="modifiers">default</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/nio/ByteBuffer.html" title="class or interface in java.nio" class="external-link">ByteBuffer</a></span>&nbsp;<span class="element-name">subscriptionUserData</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html" title="class or interface in java.util" class="external-link">Set</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;topics)</span></div>
<div class="block">Return serialized data that will be included in the <a href="ConsumerPartitionAssignor.Subscription.html" title="class in org.apache.kafka.clients.consumer"><code>ConsumerPartitionAssignor.Subscription</code></a> sent to the leader
and can be leveraged in <a href="#assign(org.apache.kafka.common.Cluster,org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.GroupSubscription)"><code>assign(Cluster, GroupSubscription)</code></a> ((e.g. local host/rack information)</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>topics</code> - Topics subscribed to through <a href="KafkaConsumer.html#subscribe(java.util.Collection)"><code>KafkaConsumer.subscribe(java.util.Collection)</code></a>
and variants</dd>
<dt>Returns:</dt>
<dd>nullable subscription user data</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="assign(org.apache.kafka.common.Cluster,org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.GroupSubscription)">
<h3>assign</h3>
<div class="member-signature"><span class="return-type"><a href="ConsumerPartitionAssignor.GroupAssignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupAssignment</a></span>&nbsp;<span class="element-name">assign</span><wbr><span class="parameters">(<a href="../../common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a>&nbsp;metadata,
<a href="ConsumerPartitionAssignor.GroupSubscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupSubscription</a>&nbsp;groupSubscription)</span></div>
<div class="block">Perform the group assignment given the member subscriptions and current cluster metadata.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>metadata</code> - Current topic/broker metadata known by consumer</dd>
<dd><code>groupSubscription</code> - Subscriptions from all members including metadata provided through <a href="#subscriptionUserData(java.util.Set)"><code>subscriptionUserData(Set)</code></a></dd>
<dt>Returns:</dt>
<dd>A map from the members to their respective assignments. This should have one entry
for each member in the input subscription map.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="onAssignment(org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.Assignment,org.apache.kafka.clients.consumer.ConsumerGroupMetadata)">
<h3>onAssignment</h3>
<div class="member-signature"><span class="modifiers">default</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">onAssignment</span><wbr><span class="parameters">(<a href="ConsumerPartitionAssignor.Assignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Assignment</a>&nbsp;assignment,
<a href="ConsumerGroupMetadata.html" title="class in org.apache.kafka.clients.consumer">ConsumerGroupMetadata</a>&nbsp;metadata)</span></div>
<div class="block">Callback which is invoked when a group member receives its assignment from the leader.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>assignment</code> - The local member's assignment as provided by the leader in <a href="#assign(org.apache.kafka.common.Cluster,org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.GroupSubscription)"><code>assign(Cluster, GroupSubscription)</code></a></dd>
<dd><code>metadata</code> - Additional metadata on the consumer (optional)</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="supportedProtocols()">
<h3>supportedProtocols</h3>
<div class="member-signature"><span class="modifiers">default</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="ConsumerPartitionAssignor.RebalanceProtocol.html" title="enum class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.RebalanceProtocol</a>&gt;</span>&nbsp;<span class="element-name">supportedProtocols</span>()</div>
<div class="block">Indicate which rebalance protocol this assignor works with;
By default it should always work with <a href="ConsumerPartitionAssignor.RebalanceProtocol.html#EAGER"><code>ConsumerPartitionAssignor.RebalanceProtocol.EAGER</code></a>.</div>
</section>
</li>
<li>
<section class="detail" id="version()">
<h3>version</h3>
<div class="member-signature"><span class="modifiers">default</span>&nbsp;<span class="return-type">short</span>&nbsp;<span class="element-name">version</span>()</div>
<div class="block">Return the version of the assignor which indicates how the user metadata encodings
and the assignment algorithm gets evolved.</div>
</section>
</li>
<li>
<section class="detail" id="name()">
<h3>name</h3>
<div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">name</span>()</div>
<div class="block">Unique name for this assignor (e.g. "range" or "roundrobin" or "sticky"). Note, this is not required
to be the same as the class name specified in <a href="ConsumerConfig.html#PARTITION_ASSIGNMENT_STRATEGY_CONFIG"><code>ConsumerConfig.PARTITION_ASSIGNMENT_STRATEGY_CONFIG</code></a></div>
<dl class="notes">
<dt>Returns:</dt>
<dd>non-null unique name</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getAssignorInstances(java.util.List,java.util.Map)">
<h3>getAssignorInstances</h3>
<div class="member-signature"><span class="modifiers">static</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor</a>&gt;</span>&nbsp;<span class="element-name">getAssignorInstances</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;assignorClasses,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;&nbsp;configs)</span></div>
<div class="block">Get a list of configured instances of <a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer"><code>ConsumerPartitionAssignor</code></a>
based on the class names/types specified by <a href="ConsumerConfig.html#PARTITION_ASSIGNMENT_STRATEGY_CONFIG"><code>ConsumerConfig.PARTITION_ASSIGNMENT_STRATEGY_CONFIG</code></a></div>
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