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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.kafka.clients.consumer</a></div> |
| <h1 title="Interface ConsumerPartitionAssignor" class="title">Interface ConsumerPartitionAssignor</h1> |
| </div> |
| <section 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> |
| <pre>public interface <span class="type-name-label">ConsumerPartitionAssignor</span></pre> |
| <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 |
| |
| 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.</div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <section class="nested-class-summary" id="nested.class.summary"> |
| <h2>Nested Class Summary</h2> |
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| <table class="summary-table"> |
| <caption><span>Nested Classes</span></caption> |
| <thead> |
| <tr> |
| <th class="col-first" scope="col">Modifier and Type</th> |
| <th class="col-second" scope="col">Interface</th> |
| <th class="col-last" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="alt-color"> |
| <td class="col-first"><code>static class </code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="ConsumerPartitionAssignor.Assignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Assignment</a></span></code></th> |
| <td class="col-last"> </td> |
| </tr> |
| <tr class="row-color"> |
| <td class="col-first"><code>static class </code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="ConsumerPartitionAssignor.GroupAssignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupAssignment</a></span></code></th> |
| <td class="col-last"> </td> |
| </tr> |
| <tr class="alt-color"> |
| <td class="col-first"><code>static class </code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="ConsumerPartitionAssignor.GroupSubscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupSubscription</a></span></code></th> |
| <td class="col-last"> </td> |
| </tr> |
| <tr class="row-color"> |
| <td class="col-first"><code>static class </code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="ConsumerPartitionAssignor.RebalanceProtocol.html" title="enum in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.RebalanceProtocol</a></span></code></th> |
| <td class="col-last"> |
| <div class="block">The rebalance protocol defines partition assignment and revocation semantics.</div> |
| </td> |
| </tr> |
| <tr class="alt-color"> |
| <td class="col-first"><code>static class </code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="ConsumerPartitionAssignor.Subscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Subscription</a></span></code></th> |
| <td class="col-last"> </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method.summary"> |
| <h2>Method Summary</h2> |
| <div class="member-summary" id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" id="t0" class="active-table-tab">All Methods</button><button role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t1" class="table-tab" onclick="show(1);">Static Methods</button><button role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t2" class="table-tab" onclick="show(2);">Instance Methods</button><button role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t3" class="table-tab" onclick="show(4);">Abstract Methods</button><button role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t5" class="table-tab" onclick="show(16);">Default Methods</button></div> |
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| <table class="summary-table" aria-labelledby="t0"> |
| <thead> |
| <tr> |
| <th class="col-first" scope="col">Modifier and Type</th> |
| <th class="col-second" scope="col">Method</th> |
| <th class="col-last" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="alt-color" id="i0"> |
| <td class="col-first"><code><a href="ConsumerPartitionAssignor.GroupAssignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupAssignment</a></code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#assign(org.apache.kafka.common.Cluster,org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.GroupSubscription)">assign</a></span>​(<a href="../../common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a> metadata, |
| <a href="ConsumerPartitionAssignor.GroupSubscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupSubscription</a> groupSubscription)</code></th> |
| <td class="col-last"> |
| <div class="block">Perform the group assignment given the member subscriptions and current cluster metadata.</div> |
| </td> |
| </tr> |
| <tr class="row-color" id="i1"> |
| <td class="col-first"><code>static <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor</a>></code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#getAssignorInstances(java.util.List,java.util.Map)">getAssignorInstances</a></span>​(<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>> assignorClasses, |
| <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a><<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,​<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>> configs)</code></th> |
| <td class="col-last"> |
| <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> |
| </td> |
| </tr> |
| <tr class="alt-color" id="i2"> |
| <td class="col-first"><code><a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#name()">name</a></span>()</code></th> |
| <td class="col-last"> |
| <div class="block">Unique name for this assignor (e.g.</div> |
| </td> |
| </tr> |
| <tr class="row-color" id="i3"> |
| <td class="col-first"><code>default void</code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#onAssignment(org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.Assignment,org.apache.kafka.clients.consumer.ConsumerGroupMetadata)">onAssignment</a></span>​(<a href="ConsumerPartitionAssignor.Assignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Assignment</a> assignment, |
| <a href="ConsumerGroupMetadata.html" title="class in org.apache.kafka.clients.consumer">ConsumerGroupMetadata</a> metadata)</code></th> |
| <td class="col-last"> |
| <div class="block">Callback which is invoked when a group member receives its assignment from the leader.</div> |
| </td> |
| </tr> |
| <tr class="alt-color" id="i4"> |
| <td class="col-first"><code>default <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/nio/ByteBuffer.html" title="class or interface in java.nio" class="external-link">ByteBuffer</a></code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#subscriptionUserData(java.util.Set)">subscriptionUserData</a></span>​(<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/Set.html" title="class or interface in java.util" class="external-link">Set</a><<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>> topics)</code></th> |
| <td class="col-last"> |
| <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> |
| </td> |
| </tr> |
| <tr class="row-color" id="i5"> |
| <td class="col-first"><code>default <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="ConsumerPartitionAssignor.RebalanceProtocol.html" title="enum in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.RebalanceProtocol</a>></code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#supportedProtocols()">supportedProtocols</a></span>()</code></th> |
| <td class="col-last"> |
| <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> |
| </td> |
| </tr> |
| <tr class="alt-color" id="i6"> |
| <td class="col-first"><code>default short</code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#version()">version</a></span>()</code></th> |
| <td class="col-last"> |
| <div class="block">Return the version of the assignor which indicates how the user metadata encodings |
| and the assignment algorithm gets evolved.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </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> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/nio/ByteBuffer.html" title="class or interface in java.nio" class="external-link">ByteBuffer</a></span> <span class="member-name">subscriptionUserData</span>​(<span class="parameters"><a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/Set.html" title="class or interface in java.util" class="external-link">Set</a><<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>> 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> <span class="member-name">assign</span>​(<span class="parameters"><a href="../../common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a> metadata, |
| <a href="ConsumerPartitionAssignor.GroupSubscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupSubscription</a> 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> <span class="return-type">void</span> <span class="member-name">onAssignment</span>​(<span class="parameters"><a href="ConsumerPartitionAssignor.Assignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Assignment</a> assignment, |
| <a href="ConsumerGroupMetadata.html" title="class in org.apache.kafka.clients.consumer">ConsumerGroupMetadata</a> 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> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="ConsumerPartitionAssignor.RebalanceProtocol.html" title="enum in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.RebalanceProtocol</a>></span> <span class="member-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> <span class="return-type">short</span> <span class="member-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/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span> <span class="member-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> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor</a>></span> <span class="member-name">getAssignorInstances</span>​(<span class="parameters"><a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>> assignorClasses, |
| <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a><<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,​<a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>> 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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