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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="Class RoundRobinAssignor" class="title">Class RoundRobinAssignor</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><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">java.lang.Object</a> |
| <div class="inheritance">org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor |
| <div class="inheritance">org.apache.kafka.clients.consumer.RoundRobinAssignor</div> |
| </div> |
| </div> |
| <section class="description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="type-name-label">RoundRobinAssignor</span> |
| extends org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</pre> |
| <div class="block"><p>The round robin assignor lays out all the available partitions and all the available consumers. It |
| then proceeds to do a round robin assignment from partition to consumer. If the subscriptions of all consumer |
| instances are identical, then the partitions will be uniformly distributed. (i.e., the partition ownership counts |
| will be within a delta of exactly one across all consumers.) |
| |
| <p>For example, suppose there are two consumers <code>C0</code> and <code>C1</code>, two topics <code>t0</code> and <code>t1</code>, |
| and each topic has 3 partitions, resulting in partitions <code>t0p0</code>, <code>t0p1</code>, <code>t0p2</code>, |
| <code>t1p0</code>, <code>t1p1</code>, and <code>t1p2</code>. |
| |
| <p>The assignment will be: |
| <ul> |
| <li><code>C0: [t0p0, t0p2, t1p1]</code> |
| <li><code>C1: [t0p1, t1p0, t1p2]</code> |
| </ul> |
| |
| <p>When subscriptions differ across consumer instances, the assignment process still considers each |
| consumer instance in round robin fashion but skips over an instance if it is not subscribed to |
| the topic. Unlike the case when subscriptions are identical, this can result in imbalanced |
| assignments. For example, we have three consumers <code>C0</code>, <code>C1</code>, <code>C2</code>, |
| and three topics <code>t0</code>, <code>t1</code>, <code>t2</code>, with 1, 2, and 3 partitions, respectively. |
| Therefore, the partitions are <code>t0p0</code>, <code>t1p0</code>, <code>t1p1</code>, <code>t2p0</code>, <code>t2p1</code>, <code>t2p2</code>. |
| <code>C0</code> is subscribed to <code>t0</code>; |
| <code>C1</code> is subscribed to <code>t0</code>, <code>t1</code>; |
| and <code>C2</code> is subscribed to <code>t0</code>, <code>t1</code>, <code>t2</code>. |
| |
| <p>That assignment will be: |
| <ul> |
| <li><code>C0: [t0p0]</code> |
| <li><code>C1: [t1p0]</code> |
| <li><code>C2: [t1p1, t2p0, t2p1, t2p2]</code> |
| </ul> |
| |
| Since the introduction of static membership, we could leverage <code>group.instance.id</code> to make the assignment behavior more sticky. |
| For example, we have three consumers with assigned <code>member.id</code> <code>C0</code>, <code>C1</code>, <code>C2</code>, |
| two topics <code>t0</code> and <code>t1</code>, and each topic has 3 partitions, resulting in partitions <code>t0p0</code>, |
| <code>t0p1</code>, <code>t0p2</code>, <code>t1p0</code>, <code>t1p1</code>, and <code>t1p2</code>. We choose to honor |
| the sorted order based on ephemeral <code>member.id</code>. |
| |
| <p>The assignment will be: |
| <ul> |
| <li><code>C0: [t0p0, t1p0]</code> |
| <li><code>C1: [t0p1, t1p1]</code> |
| <li><code>C2: [t0p2, t1p2]</code> |
| </ul> |
| |
| After one rolling bounce, group coordinator will attempt to assign new <code>member.id</code> towards consumers, |
| for example <code>C0</code> -> <code>C5</code> <code>C1</code> -> <code>C3</code>, <code>C2</code> -> <code>C4</code>. |
| |
| <p>The assignment could be completely shuffled to: |
| <ul> |
| <li><code>C3 (was C1): [t0p0, t1p0] (before was [t0p1, t1p1])</code> |
| <li><code>C4 (was C2): [t0p1, t1p1] (before was [t0p2, t1p2])</code> |
| <li><code>C5 (was C0): [t0p2, t1p2] (before was [t0p0, t1p0])</code> |
| </ul> |
| |
| This issue could be mitigated by the introduction of static membership. Consumers will have individual instance ids |
| <code>I1</code>, <code>I2</code>, <code>I3</code>. As long as |
| 1. Number of members remain the same across generation |
| 2. Static members' identities persist across generation |
| 3. Subscription pattern doesn't change for any member |
| |
| <p>The assignment will always be: |
| <ul> |
| <li><code>I0: [t0p0, t1p0]</code> |
| <li><code>I1: [t0p1, t1p1]</code> |
| <li><code>I2: [t0p2, t1p2]</code> |
| </ul></div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
| <li> |
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| <h2>Nested Class Summary</h2> |
| <div class="inherited-list"> |
| <h2 id="nested.classes.inherited.from.class.org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor">Nested classes/interfaces inherited from class org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</h2> |
| <code>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor.MemberInfo</code></div> |
| <div class="inherited-list"> |
| <h2 id="nested.classes.inherited.from.class.org.apache.kafka.clients.consumer.ConsumerPartitionAssignor">Nested classes/interfaces inherited from interface org.apache.kafka.clients.consumer.<a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor</a></h2> |
| <code><a href="ConsumerPartitionAssignor.Assignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Assignment</a>, <a href="ConsumerPartitionAssignor.GroupAssignment.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupAssignment</a>, <a href="ConsumerPartitionAssignor.GroupSubscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.GroupSubscription</a>, <a href="ConsumerPartitionAssignor.RebalanceProtocol.html" title="enum in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.RebalanceProtocol</a>, <a href="ConsumerPartitionAssignor.Subscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Subscription</a></code></div> |
| </section> |
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| <th class="col-first" scope="col">Constructor</th> |
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| <tbody> |
| <tr class="alt-color"> |
| <th class="col-constructor-name" scope="row"><code><span class="member-name-link"><a href="#%3Cinit%3E()">RoundRobinAssignor</a></span>()</code></th> |
| <td class="col-last"> </td> |
| </tr> |
| </tbody> |
| </table> |
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| </section> |
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| <h2>Method Summary</h2> |
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| <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="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/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="../../common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>></code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#assign(java.util.Map,java.util.Map)">assign</a></span>​(<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/Integer.html" title="class or interface in java.lang" class="external-link">Integer</a>> partitionsPerTopic, |
| <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="ConsumerPartitionAssignor.Subscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Subscription</a>> subscriptions)</code></th> |
| <td class="col-last"> </td> |
| </tr> |
| <tr class="row-color" id="i1"> |
| <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> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods.inherited.from.class.org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor">Methods inherited from class org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</h3> |
| <code>assign, partitions, put</code></div> |
| <div class="inherited-list"> |
| <h3 id="methods.inherited.from.class.java.lang.Object">Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods.inherited.from.class.org.apache.kafka.clients.consumer.ConsumerPartitionAssignor">Methods inherited from interface org.apache.kafka.clients.consumer.<a href="ConsumerPartitionAssignor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor</a></h3> |
| <code><a href="ConsumerPartitionAssignor.html#onAssignment(org.apache.kafka.clients.consumer.ConsumerPartitionAssignor.Assignment,org.apache.kafka.clients.consumer.ConsumerGroupMetadata)">onAssignment</a>, <a href="ConsumerPartitionAssignor.html#subscriptionUserData(java.util.Set)">subscriptionUserData</a>, <a href="ConsumerPartitionAssignor.html#supportedProtocols()">supportedProtocols</a>, <a href="ConsumerPartitionAssignor.html#version()">version</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor.detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>RoundRobinAssignor</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="member-name">RoundRobinAssignor</span>()</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method.detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="assign(java.util.Map,java.util.Map)"> |
| <h3>assign</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><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/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="../../common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>></span> <span class="member-name">assign</span>​(<span class="parameters"><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/Integer.html" title="class or interface in java.lang" class="external-link">Integer</a>> partitionsPerTopic, |
| <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="ConsumerPartitionAssignor.Subscription.html" title="class in org.apache.kafka.clients.consumer">ConsumerPartitionAssignor.Subscription</a>> subscriptions)</span></div> |
| <dl class="notes"> |
| <dt>Specified by:</dt> |
| <dd><code>assign</code> in class <code>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</code></dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="name()"> |
| <h3>name</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <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"><span class="descfrm-type-label">Description copied from interface: <code><a href="ConsumerPartitionAssignor.html#name()">ConsumerPartitionAssignor</a></code></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> |
| </ul> |
| </section> |
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