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http://git-wip-us.apache.org/repos/asf/kafka-site/blob/2e200cfc/10/javadoc/org/apache/kafka/clients/consumer/RoundRobinAssignor.html ---------------------------------------------------------------------- diff --git a/10/javadoc/org/apache/kafka/clients/consumer/RoundRobinAssignor.html b/10/javadoc/org/apache/kafka/clients/consumer/RoundRobinAssignor.html new file mode 100644 index 0000000..baa7fa3 --- /dev/null +++ b/10/javadoc/org/apache/kafka/clients/consumer/RoundRobinAssignor.html @@ -0,0 +1,357 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";> +<!-- NewPage --> +<html lang="en"> +<head> +<!-- Generated by javadoc (1.8.0_152) on Wed Nov 01 13:25:42 GMT 2017 --> +<title>RoundRobinAssignor (kafka 1.0.0 API)</title> +<meta name="date" content="2017-11-01"> +<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> +<script type="text/javascript" src="../../../../../script.js"></script> +</head> +<body> +<script type="text/javascript"><!-- + try { + if (location.href.indexOf('is-external=true') == -1) { + parent.document.title="RoundRobinAssignor (kafka 1.0.0 API)"; + } + } + catch(err) { + } +//--> +var methods = {"i0":10,"i1":10,"i2":10}; +var tabs = {65535:["t0","All Methods"],2:["t2","Instance Methods"],8:["t4","Concrete Methods"]}; +var altColor = "altColor"; +var rowColor = "rowColor"; +var tableTab = "tableTab"; +var activeTableTab = "activeTableTab"; +</script> +<noscript> +<div>JavaScript is disabled on your browser.</div> +</noscript> +<!-- ========= START OF TOP NAVBAR ======= --> +<div class="topNav"><a name="navbar.top"> +<!-- --> +</a> +<div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> +<a name="navbar.top.firstrow"> +<!-- --> +</a> +<ul class="navList" title="Navigation"> +<li><a href="../../../../../overview-summary.html">Overview</a></li> +<li><a href="package-summary.html">Package</a></li> +<li class="navBarCell1Rev">Class</li> +<li><a href="package-tree.html">Tree</a></li> +<li><a href="../../../../../deprecated-list.html">Deprecated</a></li> +<li><a href="../../../../../index-all.html">Index</a></li> +<li><a href="../../../../../help-doc.html">Help</a></li> +</ul> +</div> +<div class="subNav"> +<ul class="navList"> +<li><a href="../../../../../org/apache/kafka/clients/consumer/RetriableCommitFailedException.html" title="class in org.apache.kafka.clients.consumer"><span class="typeNameLink">Prev Class</span></a></li> +<li><a href="../../../../../org/apache/kafka/clients/consumer/StickyAssignor.html" title="class in org.apache.kafka.clients.consumer"><span class="typeNameLink">Next Class</span></a></li> +</ul> +<ul class="navList"> +<li><a href="../../../../../index.html?org/apache/kafka/clients/consumer/RoundRobinAssignor.html" target="_top">Frames</a></li> +<li><a href="RoundRobinAssignor.html" target="_top">No Frames</a></li> +</ul> +<ul class="navList" id="allclasses_navbar_top"> +<li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> +</ul> +<div> +<script type="text/javascript"><!-- + allClassesLink = document.getElementById("allclasses_navbar_top"); + if(window==top) { + allClassesLink.style.display = "block"; + } + else { + allClassesLink.style.display = "none"; + } + //--> +</script> +</div> +<div> +<ul class="subNavList"> +<li>Summary: </li> +<li>Nested | </li> +<li>Field | </li> +<li><a href="#constructor.summary">Constr</a> | </li> +<li><a href="#method.summary">Method</a></li> +</ul> +<ul class="subNavList"> +<li>Detail: </li> +<li>Field | </li> +<li><a href="#constructor.detail">Constr</a> | </li> +<li><a href="#method.detail">Method</a></li> +</ul> +</div> +<a name="skip.navbar.top"> +<!-- --> +</a></div> +<!-- ========= END OF TOP NAVBAR ========= --> +<!-- ======== START OF CLASS DATA ======== --> +<div class="header"> +<div class="subTitle">org.apache.kafka.clients.consumer</div> +<h2 title="Class RoundRobinAssignor" class="title">Class RoundRobinAssignor</h2> +</div> +<div class="contentContainer"> +<ul class="inheritance"> +<li>java.lang.Object</li> +<li> +<ul class="inheritance"> +<li>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</li> +<li> +<ul class="inheritance"> +<li>org.apache.kafka.clients.consumer.RoundRobinAssignor</li> +</ul> +</li> +</ul> +</li> +</ul> +<div class="description"> +<ul class="blockList"> +<li class="blockList"> +<dl> +<dt>All Implemented Interfaces:</dt> +<dd>org.apache.kafka.clients.consumer.internals.PartitionAssignor</dd> +</dl> +<hr> +<br> +<pre>public class <span class="typeNameLabel">RoundRobinAssignor</span> +extends org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</pre> +<div class="block">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.) + + For example, suppose there are two consumers C0 and C1, two topics t0 and t1, and each topic has 3 partitions, + resulting in partitions t0p0, t0p1, t0p2, t1p0, t1p1, and t1p2. + + The assignment will be: + C0: [t0p0, t0p2, t1p1] + C1: [t0p1, t1p0, t1p2] + + 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 C0, C1, C2, and three topics t0, t1, t2, + with 1, 2, and 3 partitions, respectively. Therefore, the partitions are t0p0, t1p0, t1p1, t2p0, + t2p1, t2p2. C0 is subscribed to t0; C1 is subscribed to t0, t1; and C2 is subscribed to t0, t1, t2. + + Tha assignment will be: + C0: [t0p0] + C1: [t1p0] + C2: [t1p1, t2p0, t2p1, t2p2]</div> +</li> +</ul> +</div> +<div class="summary"> +<ul class="blockList"> +<li class="blockList"> +<!-- ======== NESTED CLASS SUMMARY ======== --> +<ul class="blockList"> +<li class="blockList"><a name="nested.class.summary"> +<!-- --> +</a> +<h3>Nested Class Summary</h3> +<ul class="blockList"> +<li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.kafka.clients.consumer.internals.PartitionAssignor"> +<!-- --> +</a> +<h3>Nested classes/interfaces inherited from interface org.apache.kafka.clients.consumer.internals.PartitionAssignor</h3> +<code>org.apache.kafka.clients.consumer.internals.PartitionAssignor.Assignment, org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription</code></li> +</ul> +</li> +</ul> +<!-- ======== CONSTRUCTOR SUMMARY ======== --> +<ul class="blockList"> +<li class="blockList"><a name="constructor.summary"> +<!-- --> +</a> +<h3>Constructor Summary</h3> +<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> +<caption><span>Constructors</span><span class="tabEnd"> </span></caption> +<tr> +<th class="colOne" scope="col">Constructor and Description</th> +</tr> +<tr class="altColor"> +<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/RoundRobinAssignor.html#RoundRobinAssignor--">RoundRobinAssignor</a></span>()</code> </td> +</tr> +</table> +</li> +</ul> +<!-- ========== METHOD SUMMARY =========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.summary"> +<!-- --> +</a> +<h3>Method Summary</h3> +<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> +<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> +<tr> +<th class="colFirst" scope="col">Modifier and Type</th> +<th class="colLast" scope="col">Method and Description</th> +</tr> +<tr id="i0" class="altColor"> +<td class="colFirst"><code>java.util.List<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>></code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/RoundRobinAssignor.html#allPartitionsSorted-java.util.Map-java.util.Map-">allPartitionsSorted</a></span>(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic, + java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)</code> </td> +</tr> +<tr id="i1" class="rowColor"> +<td class="colFirst"><code>java.util.Map<java.lang.String,java.util.List<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>></code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/RoundRobinAssignor.html#assign-java.util.Map-java.util.Map-">assign</a></span>(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic, + java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)</code> </td> +</tr> +<tr id="i2" class="altColor"> +<td class="colFirst"><code>java.lang.String</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/RoundRobinAssignor.html#name--">name</a></span>()</code> </td> +</tr> +</table> +<ul class="blockList"> +<li class="blockList"><a name="methods.inherited.from.class.org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor"> +<!-- --> +</a> +<h3>Methods inherited from class org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</h3> +<code>assign, onAssignment, partitions, put, subscription</code></li> +</ul> +<ul class="blockList"> +<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> +<!-- --> +</a> +<h3>Methods inherited from class java.lang.Object</h3> +<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +<div class="details"> +<ul class="blockList"> +<li class="blockList"> +<!-- ========= CONSTRUCTOR DETAIL ======== --> +<ul class="blockList"> +<li class="blockList"><a name="constructor.detail"> +<!-- --> +</a> +<h3>Constructor Detail</h3> +<a name="RoundRobinAssignor--"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>RoundRobinAssignor</h4> +<pre>public RoundRobinAssignor()</pre> +</li> +</ul> +</li> +</ul> +<!-- ============ METHOD DETAIL ========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.detail"> +<!-- --> +</a> +<h3>Method Detail</h3> +<a name="assign-java.util.Map-java.util.Map-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>assign</h4> +<pre>public java.util.Map<java.lang.String,java.util.List<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>> assign(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic, + java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)</pre> +<dl> +<dt><span class="overrideSpecifyLabel">Specified by:</span></dt> +<dd><code>assign</code> in class <code>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</code></dd> +</dl> +</li> +</ul> +<a name="allPartitionsSorted-java.util.Map-java.util.Map-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>allPartitionsSorted</h4> +<pre>public java.util.List<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>> allPartitionsSorted(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic, + java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)</pre> +</li> +</ul> +<a name="name--"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>name</h4> +<pre>public java.lang.String name()</pre> +</li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +</div> +<!-- ========= END OF CLASS DATA ========= --> 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CLASS DATA ======== --> +<div class="header"> +<div class="subTitle">org.apache.kafka.clients.consumer</div> +<h2 title="Class StickyAssignor" class="title">Class StickyAssignor</h2> +</div> +<div class="contentContainer"> +<ul class="inheritance"> +<li>java.lang.Object</li> +<li> +<ul class="inheritance"> +<li>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</li> +<li> +<ul class="inheritance"> +<li>org.apache.kafka.clients.consumer.StickyAssignor</li> +</ul> +</li> +</ul> +</li> +</ul> +<div class="description"> +<ul class="blockList"> +<li class="blockList"> +<dl> +<dt>All Implemented Interfaces:</dt> +<dd>org.apache.kafka.clients.consumer.internals.PartitionAssignor</dd> +</dl> +<hr> +<br> +<pre>public class <span class="typeNameLabel">StickyAssignor</span> +extends org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</pre> +<div class="block"><p>The sticky assignor serves two purposes. First, it guarantees an assignment that is as balanced as possible, meaning either: + <ul> + <li>the numbers of topic partitions assigned to consumers differ by at most one; or</li> + <li>each consumer that has 2+ fewer topic partitions than some other consumer cannot get any of those topic partitions transferred to it.</li> + </ul> + Second, it preserved as many existing assignment as possible when a reassignment occurs. This helps in saving some of the + overhead processing when topic partitions move from one consumer to another.</p> + + <p>Starting fresh it would work by distributing the partitions over consumers as evenly as possible. Even though this may sound similar to + how round robin assignor works, the second example below shows that it is not. + During a reassignment it would perform the reassignment in such a way that in the new assignment + <ol> + <li>topic partitions are still distributed as evenly as possible, and</li> + <li>topic partitions stay with their previously assigned consumers as much as possible.</li> + </ol> + Of course, the first goal above takes precedence over the second one.</p> + + <p><b>Example 1.</b> Suppose there are three consumers <code>C0</code>, <code>C1</code>, <code>C2</code>, + four topics <code>t0,</code> <code>t1</code>, <code>t2</code>, <code>t3</code>, and each topic has 2 partitions, + resulting in partitions <code>t0p0</code>, <code>t0p1</code>, <code>t1p0</code>, <code>t1p1</code>, <code>t2p0</code>, + <code>t2p1</code>, <code>t3p0</code>, <code>t3p1</code>. Each consumer is subscribed to all three topics. + + The assignment with both sticky and round robin assignors will be: + <ul> + <li><code>C0: [t0p0, t1p1, t3p0]</code></li> + <li><code>C1: [t0p1, t2p0, t3p1]</code></li> + <li><code>C2: [t1p0, t2p1]</code></li> + </ul> + + Now, let's assume <code>C1</code> is removed and a reassignment is about to happen. The round robin assignor would produce: + <ul> + <li><code>C0: [t0p0, t1p0, t2p0, t3p0]</code></li> + <li><code>C2: [t0p1, t1p1, t2p1, t3p1]</code></li> + </ul> + + while the sticky assignor would result in: + <ul> + <li><code>C0 [t0p0, t1p1, t3p0, t2p0]</code></li> + <li><code>C2 [t1p0, t2p1, t0p1, t3p1]</code></li> + </ul> + preserving all the previous assignments (unlike the round robin assignor). +</p> + <p><b>Example 2.</b> There are 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>. + + The round robin assignor would come up with the following assignment: + <ul> + <li><code>C0 [t0p0]</code></li> + <li><code>C1 [t1p0]</code></li> + <li><code>C2 [t1p1, t2p0, t2p1, t2p2]</code></li> + </ul> + + which is not as balanced as the assignment suggested by sticky assignor: + <ul> + <li><code>C0 [t0p0]</code></li> + <li><code>C1 [t1p0, t1p1]</code></li> + <li><code>C2 [t2p0, t2p1, t2p2]</code></li> + </ul> + + Now, if consumer <code>C0</code> is removed, these two assignors would produce the following assignments. + Round Robin (preserves 3 partition assignments): + <ul> + <li><code>C1 [t0p0, t1p1]</code></li> + <li><code>C2 [t1p0, t2p0, t2p1, t2p2]</code></li> + </ul> + + Sticky (preserves 5 partition assignments): + <ul> + <li><code>C1 [t1p0, t1p1, t0p0]</code></li> + <li><code>C2 [t2p0, t2p1, t2p2]</code></li> + </ul> +</p> + <h3>Impact on <code>ConsumerRebalanceListener</code></h3> + The sticky assignment strategy can provide some optimization to those consumers that have some partition cleanup code + in their <code>onPartitionsRevoked()</code> callback listeners. The cleanup code is placed in that callback listener + because the consumer has no assumption or hope of preserving any of its assigned partitions after a rebalance when it + is using range or round robin assignor. The listener code would look like this: + <pre> + <code> + class TheOldRebalanceListener implements ConsumerRebalanceListener { + + void onPartitionsRevoked(Collection<TopicPartition> partitions) { + for (TopicPartition partition: partitions) { + commitOffsets(partition); + cleanupState(partition); + } + } + + void onPartitionsAssigned(Collection<TopicPartition> partitions) { + for (TopicPartition partition: partitions) { + initializeState(partition); + initializeOffset(partition); + } + } + } + </code> + </pre> + + As mentioned above, one advantage of the sticky assignor is that, in general, it reduces the number of partitions that + actually move from one consumer to another during a reassignment. Therefore, it allows consumers to do their cleanup + more efficiently. Of course, they still can perform the partition cleanup in the <code>onPartitionsRevoked()</code> + listener, but they can be more efficient and make a note of their partitions before and after the rebalance, and do the + cleanup after the rebalance only on the partitions they have lost (which is normally not a lot). The code snippet below + clarifies this point: + <pre> + <code> + class TheNewRebalanceListener implements ConsumerRebalanceListener { + Collection<TopicPartition> lastAssignment = Collections.emptyList(); + + void onPartitionsRevoked(Collection<TopicPartition> partitions) { + for (TopicPartition partition: partitions) + commitOffsets(partition); + } + + void onPartitionsAssigned(Collection<TopicPartition> assignment) { + for (TopicPartition partition: difference(lastAssignment, assignment)) + cleanupState(partition); + + for (TopicPartition partition: difference(assignment, lastAssignment)) + initializeState(partition); + + for (TopicPartition partition: assignment) + initializeOffset(partition); + + this.lastAssignment = assignment; + } + } + </code> + </pre> + + Any consumer that uses sticky assignment can leverage this listener like this: + <code>consumer.subscribe(topics, new TheNewRebalanceListener());</code></div> +</li> +</ul> +</div> +<div class="summary"> +<ul class="blockList"> +<li class="blockList"> +<!-- ======== NESTED CLASS SUMMARY ======== --> +<ul class="blockList"> +<li class="blockList"><a name="nested.class.summary"> +<!-- --> +</a> +<h3>Nested Class Summary</h3> +<ul class="blockList"> +<li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.kafka.clients.consumer.internals.PartitionAssignor"> +<!-- --> +</a> +<h3>Nested classes/interfaces inherited from interface org.apache.kafka.clients.consumer.internals.PartitionAssignor</h3> +<code>org.apache.kafka.clients.consumer.internals.PartitionAssignor.Assignment, org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription</code></li> +</ul> +</li> +</ul> +<!-- ======== CONSTRUCTOR SUMMARY ======== --> +<ul class="blockList"> +<li class="blockList"><a name="constructor.summary"> +<!-- --> +</a> +<h3>Constructor Summary</h3> +<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> +<caption><span>Constructors</span><span class="tabEnd"> </span></caption> +<tr> +<th class="colOne" scope="col">Constructor and Description</th> +</tr> +<tr class="altColor"> +<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/StickyAssignor.html#StickyAssignor--">StickyAssignor</a></span>()</code> </td> +</tr> +</table> +</li> +</ul> +<!-- ========== METHOD SUMMARY =========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.summary"> +<!-- --> +</a> +<h3>Method Summary</h3> +<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> +<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> +<tr> +<th class="colFirst" scope="col">Modifier and Type</th> +<th class="colLast" scope="col">Method and Description</th> +</tr> +<tr id="i0" class="altColor"> +<td class="colFirst"><code>java.util.Map<java.lang.String,java.util.List<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>></code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/StickyAssignor.html#assign-java.util.Map-java.util.Map-">assign</a></span>(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic, + java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)</code> </td> +</tr> +<tr id="i1" class="rowColor"> +<td class="colFirst"><code>java.lang.String</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/StickyAssignor.html#name--">name</a></span>()</code> </td> +</tr> +<tr id="i2" class="altColor"> +<td class="colFirst"><code>void</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/StickyAssignor.html#onAssignment-org.apache.kafka.clients.consumer.internals.PartitionAssignor.Assignment-">onAssignment</a></span>(org.apache.kafka.clients.consumer.internals.PartitionAssignor.Assignment assignment)</code> </td> +</tr> +<tr id="i3" class="rowColor"> +<td class="colFirst"><code>org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/StickyAssignor.html#subscription-java.util.Set-">subscription</a></span>(java.util.Set<java.lang.String> topics)</code> </td> +</tr> +</table> +<ul class="blockList"> +<li class="blockList"><a name="methods.inherited.from.class.org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor"> +<!-- --> +</a> +<h3>Methods inherited from class org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</h3> +<code>assign, partitions, put</code></li> +</ul> +<ul class="blockList"> +<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> +<!-- --> +</a> +<h3>Methods inherited from class java.lang.Object</h3> +<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +<div class="details"> +<ul class="blockList"> +<li class="blockList"> +<!-- ========= CONSTRUCTOR DETAIL ======== --> +<ul class="blockList"> +<li class="blockList"><a name="constructor.detail"> +<!-- --> +</a> +<h3>Constructor Detail</h3> +<a name="StickyAssignor--"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>StickyAssignor</h4> +<pre>public StickyAssignor()</pre> +</li> +</ul> +</li> +</ul> +<!-- ============ METHOD DETAIL ========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.detail"> +<!-- --> +</a> +<h3>Method Detail</h3> +<a name="assign-java.util.Map-java.util.Map-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>assign</h4> +<pre>public java.util.Map<java.lang.String,java.util.List<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>> assign(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic, + java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)</pre> +<dl> +<dt><span class="overrideSpecifyLabel">Specified by:</span></dt> +<dd><code>assign</code> in class <code>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</code></dd> +</dl> +</li> +</ul> +<a name="onAssignment-org.apache.kafka.clients.consumer.internals.PartitionAssignor.Assignment-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>onAssignment</h4> +<pre>public void onAssignment(org.apache.kafka.clients.consumer.internals.PartitionAssignor.Assignment assignment)</pre> +<dl> +<dt><span class="overrideSpecifyLabel">Specified by:</span></dt> +<dd><code>onAssignment</code> in interface <code>org.apache.kafka.clients.consumer.internals.PartitionAssignor</code></dd> +<dt><span class="overrideSpecifyLabel">Overrides:</span></dt> +<dd><code>onAssignment</code> in class <code>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</code></dd> +</dl> +</li> +</ul> +<a name="subscription-java.util.Set-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>subscription</h4> +<pre>public org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription subscription(java.util.Set<java.lang.String> topics)</pre> +<dl> +<dt><span class="overrideSpecifyLabel">Specified by:</span></dt> +<dd><code>subscription</code> in interface <code>org.apache.kafka.clients.consumer.internals.PartitionAssignor</code></dd> +<dt><span class="overrideSpecifyLabel">Overrides:</span></dt> +<dd><code>subscription</code> in class <code>org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor</code></dd> +</dl> +</li> +</ul> +<a name="name--"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>name</h4> +<pre>public java.lang.String name()</pre> +</li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +</div> +<!-- ========= END OF CLASS DATA ========= --> +<!-- ======= START OF BOTTOM NAVBAR ====== --> +<div class="bottomNav"><a name="navbar.bottom"> +<!-- --> +</a> +<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> +<a name="navbar.bottom.firstrow"> +<!-- --> +</a> +<ul class="navList" title="Navigation"> +<li><a 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href="OffsetOutOfRangeException.html" title="class in org.apache.kafka.clients.consumer" target="classFrame">OffsetOutOfRangeException</a></li> +<li><a href="RetriableCommitFailedException.html" title="class in org.apache.kafka.clients.consumer" target="classFrame">RetriableCommitFailedException</a></li> +</ul> +</div> +</body> +</html> http://git-wip-us.apache.org/repos/asf/kafka-site/blob/2e200cfc/10/javadoc/org/apache/kafka/clients/consumer/package-summary.html ---------------------------------------------------------------------- diff --git a/10/javadoc/org/apache/kafka/clients/consumer/package-summary.html b/10/javadoc/org/apache/kafka/clients/consumer/package-summary.html new file mode 100644 index 0000000..d703929 --- /dev/null +++ b/10/javadoc/org/apache/kafka/clients/consumer/package-summary.html @@ -0,0 +1,290 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";> +<!-- NewPage --> +<html lang="en"> +<head> +<!-- Generated 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href="../../../../../org/apache/kafka/clients/consumer/Consumer.html" title="interface in org.apache.kafka.clients.consumer">Consumer</a><K,V></td> +<td class="colLast"> </td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerInterceptor.html" title="interface in org.apache.kafka.clients.consumer">ConsumerInterceptor</a><K,V></td> +<td class="colLast"> +<div class="block">A plugin interface that allows you to intercept (and possibly mutate) records received by the consumer.</div> +</td> +</tr> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html" title="interface in org.apache.kafka.clients.consumer">ConsumerRebalanceListener</a></td> +<td class="colLast"> +<div class="block">A callback interface that the user can implement to trigger custom actions when the set of partitions assigned to the + consumer changes.</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/OffsetCommitCallback.html" title="interface in org.apache.kafka.clients.consumer">OffsetCommitCallback</a></td> +<td class="colLast"> +<div class="block">A callback interface that the user can implement to trigger custom actions when a commit request completes.</div> +</td> +</tr> +</tbody> +</table> +</li> +<li class="blockList"> +<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation"> +<caption><span>Class Summary</span><span class="tabEnd"> </span></caption> +<tr> +<th class="colFirst" scope="col">Class</th> +<th class="colLast" scope="col">Description</th> +</tr> +<tbody> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerConfig.html" title="class in org.apache.kafka.clients.consumer">ConsumerConfig</a></td> +<td class="colLast"> +<div class="block">The consumer configuration keys</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><K,V></td> +<td class="colLast"> +<div class="block">A key/value pair to be received from Kafka.</div> +</td> +</tr> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecords</a><K,V></td> +<td class="colLast"> +<div class="block">A container that holds the list <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer"><code>ConsumerRecord</code></a> per partition for a + particular topic.</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html" title="class in org.apache.kafka.clients.consumer">KafkaConsumer</a><K,V></td> +<td class="colLast"> +<div class="block">A client that consumes records from a Kafka cluster.</div> +</td> +</tr> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/MockConsumer.html" title="class in org.apache.kafka.clients.consumer">MockConsumer</a><K,V></td> +<td class="colLast"> +<div class="block">A mock of the <a href="../../../../../org/apache/kafka/clients/consumer/Consumer.html" title="interface in org.apache.kafka.clients.consumer"><code>Consumer</code></a> interface you can use for testing code that uses Kafka.</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/OffsetAndMetadata.html" title="class in org.apache.kafka.clients.consumer">OffsetAndMetadata</a></td> +<td class="colLast"> +<div class="block">The Kafka offset commit API allows users to provide additional metadata (in the form of a string) + when an offset is committed.</div> +</td> +</tr> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/OffsetAndTimestamp.html" title="class in org.apache.kafka.clients.consumer">OffsetAndTimestamp</a></td> +<td class="colLast"> +<div class="block">A container class for offset and timestamp.</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/RangeAssignor.html" title="class in org.apache.kafka.clients.consumer">RangeAssignor</a></td> +<td class="colLast"> +<div class="block">The range assignor works on a per-topic basis.</div> +</td> +</tr> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/RoundRobinAssignor.html" title="class in org.apache.kafka.clients.consumer">RoundRobinAssignor</a></td> +<td class="colLast"> +<div class="block">The round robin assignor lays out all the available partitions and all the available consumers.</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/StickyAssignor.html" title="class in org.apache.kafka.clients.consumer">StickyAssignor</a></td> +<td class="colLast"> +<div class="block">The sticky assignor serves two purposes.</div> +</td> +</tr> +</tbody> +</table> +</li> +<li class="blockList"> +<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Enum Summary table, listing enums, and an explanation"> +<caption><span>Enum Summary</span><span class="tabEnd"> </span></caption> +<tr> +<th class="colFirst" scope="col">Enum</th> +<th class="colLast" scope="col">Description</th> +</tr> +<tbody> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/OffsetResetStrategy.html" title="enum in org.apache.kafka.clients.consumer">OffsetResetStrategy</a></td> +<td class="colLast"> </td> +</tr> +</tbody> +</table> +</li> +<li class="blockList"> +<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Exception Summary table, listing exceptions, and an explanation"> +<caption><span>Exception Summary</span><span class="tabEnd"> </span></caption> +<tr> +<th class="colFirst" scope="col">Exception</th> +<th class="colLast" scope="col">Description</th> +</tr> +<tbody> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/CommitFailedException.html" title="class in org.apache.kafka.clients.consumer">CommitFailedException</a></td> +<td class="colLast"> +<div class="block">This exception is raised when an offset commit with <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html#commitSync--"><code>KafkaConsumer.commitSync()</code></a> fails + with an unrecoverable error.</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/InvalidOffsetException.html" title="class in org.apache.kafka.clients.consumer">InvalidOffsetException</a></td> +<td class="colLast"> +<div class="block">Thrown when the offset for a set of partitions is invalid (either undefined or out of range), + and no reset policy has been configured.</div> +</td> +</tr> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/NoOffsetForPartitionException.html" title="class in org.apache.kafka.clients.consumer">NoOffsetForPartitionException</a></td> +<td class="colLast"> +<div class="block">Indicates that there is no stored offset for a partition and no defined offset + reset policy.</div> +</td> +</tr> +<tr class="rowColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/OffsetOutOfRangeException.html" title="class in org.apache.kafka.clients.consumer">OffsetOutOfRangeException</a></td> +<td class="colLast"> +<div class="block">No reset policy has been defined, and the offsets for these partitions are either larger or smaller + than the range of offsets the server has for the given partition.</div> +</td> +</tr> +<tr class="altColor"> +<td class="colFirst"><a href="../../../../../org/apache/kafka/clients/consumer/RetriableCommitFailedException.html" title="class in org.apache.kafka.clients.consumer">RetriableCommitFailedException</a></td> +<td class="colLast"> </td> +</tr> +</tbody> +</table> +</li> +</ul> +</div> +<!-- ======= START OF BOTTOM NAVBAR ====== --> +<div class="bottomNav"><a name="navbar.bottom"> +<!-- --> +</a> +<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> +<a name="navbar.bottom.firstrow"> +<!-- --> +</a> +<ul class="navList" title="Navigation"> +<li><a href="../../../../../overview-summary.html">Overview</a></li> +<li class="navBarCell1Rev">Package</li> +<li>Class</li> +<li><a 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