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Posted to commits@kafka.apache.org by gu...@apache.org on 2017/11/01 22:40:49 UTC
[27/51] [partial] kafka-site git commit: MINOR: Follow-up Update on
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+<div class="header">
+<div class="subTitle">org.apache.kafka.clients.consumer</div>
+<h2 title="Interface ConsumerRebalanceListener" class="title">Interface ConsumerRebalanceListener</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
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+<hr>
+<br>
+<pre>public interface <span class="typeNameLabel">ConsumerRebalanceListener</span></pre>
+<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.
+ <p>
+ This is applicable when the consumer is having Kafka auto-manage group membership. If the consumer directly assigns partitions,
+ those partitions will never be reassigned and this callback is not applicable.
+ <p>
+ When Kafka is managing the group membership, a partition re-assignment will be triggered any time the members of the group change or the subscription
+ of the members changes. This can occur when processes die, new process instances are added or old instances come back to life after failure.
+ Rebalances can also be triggered by changes affecting the subscribed topics (e.g. when the number of partitions is
+ administratively adjusted).
+ <p>
+ There are many uses for this functionality. One common use is saving offsets in a custom store. By saving offsets in
+ the <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsRevoked-java.util.Collection-"><code>onPartitionsRevoked(Collection)</code></a> call we can ensure that any time partition assignment changes
+ the offset gets saved.
+ <p>
+ Another use is flushing out any kind of cache of intermediate results the consumer may be keeping. For example,
+ consider a case where the consumer is subscribed to a topic containing user page views, and the goal is to count the
+ number of page views per user for each five minute window. Let's say the topic is partitioned by the user id so that
+ all events for a particular user go to a single consumer instance. The consumer can keep in memory a running
+ tally of actions per user and only flush these out to a remote data store when its cache gets too big. However if a
+ partition is reassigned it may want to automatically trigger a flush of this cache, before the new owner takes over
+ consumption.
+ <p>
+ This callback will execute in the user thread as part of the <a href="../../../../../org/apache/kafka/clients/consumer/Consumer.html#poll-long-"><code>poll(long)</code></a> call whenever partition assignment changes.
+ <p>
+ It is guaranteed that all consumer processes will invoke <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsRevoked-java.util.Collection-"><code>onPartitionsRevoked</code></a> prior to
+ any process invoking <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsAssigned-java.util.Collection-"><code>onPartitionsAssigned</code></a>. So if offsets or other state is saved in the
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsRevoked-java.util.Collection-"><code>onPartitionsRevoked</code></a> call it is guaranteed to be saved by the time the process taking over that
+ partition has their <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsAssigned-java.util.Collection-"><code>onPartitionsAssigned</code></a> callback called to load the state.
+ <p>
+ Here is pseudo-code for a callback implementation for saving offsets:
+ <pre>
+ <code>
+ public class SaveOffsetsOnRebalance implements ConsumerRebalanceListener {
+ private Consumer<?,?> consumer;
+
+ public SaveOffsetsOnRebalance(Consumer<?,?> consumer) {
+ this.consumer = consumer;
+ }
+
+ public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
+ // save the offsets in an external store using some custom code not described here
+ for(TopicPartition partition: partitions)
+ saveOffsetInExternalStore(consumer.position(partition));
+ }
+
+ public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
+ // read the offsets from an external store using some custom code not described here
+ for(TopicPartition partition: partitions)
+ consumer.seek(partition, readOffsetFromExternalStore(partition));
+ }
+ }
+ </code>
+ </pre></div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
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+<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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract 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>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsAssigned-java.util.Collection-">onPartitionsAssigned</a></span>(java.util.Collection<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>> partitions)</code>
+<div class="block">A callback method the user can implement to provide handling of customized offsets on completion of a successful
+ partition re-assignment.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsRevoked-java.util.Collection-">onPartitionsRevoked</a></span>(java.util.Collection<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>> partitions)</code>
+<div class="block">A callback method the user can implement to provide handling of offset commits to a customized store on the start
+ of a rebalance operation.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+</li>
+</ul>
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+<div class="details">
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+<!-- ============ METHOD DETAIL ========== -->
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+<ul class="blockList">
+<li class="blockList">
+<h4>onPartitionsRevoked</h4>
+<pre>void onPartitionsRevoked(java.util.Collection<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>> partitions)</pre>
+<div class="block">A callback method the user can implement to provide handling of offset commits to a customized store on the start
+ of a rebalance operation. This method will be called before a rebalance operation starts and after the consumer
+ stops fetching data. It is recommended that offsets should be committed in this callback to either Kafka or a
+ custom offset store to prevent duplicate data.
+ <p>
+ For examples on usage of this API, see Usage Examples section of <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html" title="class in org.apache.kafka.clients.consumer"><code>KafkaConsumer</code></a>
+ <p>
+ <b>NOTE:</b> This method is only called before rebalances. It is not called prior to <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html#close--"><code>KafkaConsumer.close()</code></a>.
+ <p>
+ It is common for the revocation callback to use the consumer instance in order to commit offsets. It is possible
+ for a <a href="../../../../../org/apache/kafka/common/errors/WakeupException.html" title="class in org.apache.kafka.common.errors"><code>WakeupException</code></a> or <a href="../../../../../org/apache/kafka/common/errors/InterruptException.html" title="class in org.apache.kafka.common.errors"><code>InterruptException</code></a>
+ to be raised from one these nested invocations. In this case, the exception will be propagated to the current
+ invocation of <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html#poll-long-"><code>KafkaConsumer.poll(long)</code></a> in which this callback is being executed. This means it is not
+ necessary to catch these exceptions and re-attempt to wakeup or interrupt the consumer thread.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>partitions</code> - The list of partitions that were assigned to the consumer on the last rebalance</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/kafka/common/errors/WakeupException.html" title="class in org.apache.kafka.common.errors">WakeupException</a></code> - If raised from a nested call to <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html" title="class in org.apache.kafka.clients.consumer"><code>KafkaConsumer</code></a></dd>
+<dd><code><a href="../../../../../org/apache/kafka/common/errors/InterruptException.html" title="class in org.apache.kafka.common.errors">InterruptException</a></code> - If raised from a nested call to <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html" title="class in org.apache.kafka.clients.consumer"><code>KafkaConsumer</code></a></dd>
+</dl>
+</li>
+</ul>
+<a name="onPartitionsAssigned-java.util.Collection-">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>onPartitionsAssigned</h4>
+<pre>void onPartitionsAssigned(java.util.Collection<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>> partitions)</pre>
+<div class="block">A callback method the user can implement to provide handling of customized offsets on completion of a successful
+ partition re-assignment. This method will be called after an offset re-assignment completes and before the
+ consumer starts fetching data.
+ <p>
+ It is guaranteed that all the processes in a consumer group will execute their
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsRevoked-java.util.Collection-"><code>onPartitionsRevoked(Collection)</code></a> callback before any instance executes its
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRebalanceListener.html#onPartitionsAssigned-java.util.Collection-"><code>onPartitionsAssigned(Collection)</code></a> callback.
+ <p>
+ It is common for the assignment callback to use the consumer instance in order to query offsets. It is possible
+ for a <a href="../../../../../org/apache/kafka/common/errors/WakeupException.html" title="class in org.apache.kafka.common.errors"><code>WakeupException</code></a> or <a href="../../../../../org/apache/kafka/common/errors/InterruptException.html" title="class in org.apache.kafka.common.errors"><code>InterruptException</code></a>
+ to be raised from one these nested invocations. In this case, the exception will be propagated to the current
+ invocation of <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html#poll-long-"><code>KafkaConsumer.poll(long)</code></a> in which this callback is being executed. This means it is not
+ necessary to catch these exceptions and re-attempt to wakeup or interrupt the consumer thread.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>partitions</code> - The list of partitions that are now assigned to the consumer (may include partitions previously
+ assigned to the consumer)</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/kafka/common/errors/WakeupException.html" title="class in org.apache.kafka.common.errors">WakeupException</a></code> - If raised from a nested call to <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html" title="class in org.apache.kafka.clients.consumer"><code>KafkaConsumer</code></a></dd>
+<dd><code><a href="../../../../../org/apache/kafka/common/errors/InterruptException.html" title="class in org.apache.kafka.common.errors">InterruptException</a></code> - If raised from a nested call to <a href="../../../../../org/apache/kafka/clients/consumer/KafkaConsumer.html" title="class in org.apache.kafka.clients.consumer"><code>KafkaConsumer</code></a></dd>
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+<li><a href="#method.summary">Method</a></li>
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+<div class="header">
+<div class="subTitle">org.apache.kafka.clients.consumer</div>
+<h2 title="Class ConsumerRecord" class="title">Class ConsumerRecord<K,V></h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.kafka.clients.consumer.ConsumerRecord<K,V></li>
+</ul>
+</li>
+</ul>
+<div class="description">
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+<br>
+<pre>public class <span class="typeNameLabel">ConsumerRecord<K,V></span>
+extends java.lang.Object</pre>
+<div class="block">A key/value pair to be received from Kafka. This also consists of a topic name and
+ a partition number from which the record is being received, an offset that points
+ to the record in a Kafka partition, and a timestamp as marked by the corresponding ProducerRecord.</div>
+</li>
+</ul>
+</div>
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+<!-- =========== FIELD SUMMARY =========== -->
+<ul class="blockList">
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+<caption><span>Fields</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Field and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#NO_TIMESTAMP">NO_TIMESTAMP</a></span></code> </td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#NULL_CHECKSUM">NULL_CHECKSUM</a></span></code> </td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#NULL_SIZE">NULL_SIZE</a></span></code> </td>
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+</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/ConsumerRecord.html#ConsumerRecord-java.lang.String-int-long-K-V-">ConsumerRecord</a></span>(java.lang.String topic,
+ int partition,
+ long offset,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">K</a> key,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a> value)</code>
+<div class="block">Creates a record to be received from a specified topic and partition (provided for
+ compatibility with Kafka 0.9 before the message format supported timestamps and before
+ serialized metadata were exposed).</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#ConsumerRecord-java.lang.String-int-long-long-org.apache.kafka.common.record.TimestampType-long-int-int-K-V-">ConsumerRecord</a></span>(java.lang.String topic,
+ int partition,
+ long offset,
+ long timestamp,
+ org.apache.kafka.common.record.TimestampType timestampType,
+ long checksum,
+ int serializedKeySize,
+ int serializedValueSize,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">K</a> key,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a> value)</code>
+<div class="block">Creates a record to be received from a specified topic and partition (provided for
+ compatibility with Kafka 0.10 before the message format supported headers).</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#ConsumerRecord-java.lang.String-int-long-long-org.apache.kafka.common.record.TimestampType-java.lang.Long-int-int-K-V-org.apache.kafka.common.header.Headers-">ConsumerRecord</a></span>(java.lang.String topic,
+ int partition,
+ long offset,
+ long timestamp,
+ org.apache.kafka.common.record.TimestampType timestampType,
+ java.lang.Long checksum,
+ int serializedKeySize,
+ int serializedValueSize,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">K</a> key,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a> value,
+ <a href="../../../../../org/apache/kafka/common/header/Headers.html" title="interface in org.apache.kafka.common.header">Headers</a> headers)</code>
+<div class="block">Creates a record to be received from a specified topic and partition</div>
+</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><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated 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>long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#checksum--">checksum</a></span>()</code>
+<div class="block"><span class="deprecatedLabel">Deprecated.</span>
+<div class="block"><span class="deprecationComment">As of Kafka 0.11.0. Because of the potential for message format conversion on the broker, the
+ checksum returned by the broker may not match what was computed by the producer.
+ It is therefore unsafe to depend on this checksum for end-to-end delivery guarantees. Additionally,
+ message format v2 does not include a record-level checksum (for performance, the record checksum
+ was replaced with a batch checksum). To maintain compatibility, a partial checksum computed from
+ the record timestamp, serialized key size, and serialized value size is returned instead, but
+ this should not be depended on for end-to-end reliability.</span></div>
+</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/kafka/common/header/Headers.html" title="interface in org.apache.kafka.common.header">Headers</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#headers--">headers</a></span>()</code>
+<div class="block">The headers</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">K</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#key--">key</a></span>()</code>
+<div class="block">The key (or null if no key is specified)</div>
+</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#offset--">offset</a></span>()</code>
+<div class="block">The position of this record in the corresponding Kafka partition.</div>
+</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#partition--">partition</a></span>()</code>
+<div class="block">The partition from which this record is received</div>
+</td>
+</tr>
+<tr id="i5" class="rowColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#serializedKeySize--">serializedKeySize</a></span>()</code>
+<div class="block">The size of the serialized, uncompressed key in bytes.</div>
+</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#serializedValueSize--">serializedValueSize</a></span>()</code>
+<div class="block">The size of the serialized, uncompressed value in bytes.</div>
+</td>
+</tr>
+<tr id="i7" class="rowColor">
+<td class="colFirst"><code>long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#timestamp--">timestamp</a></span>()</code>
+<div class="block">The timestamp of this record</div>
+</td>
+</tr>
+<tr id="i8" class="altColor">
+<td class="colFirst"><code>org.apache.kafka.common.record.TimestampType</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#timestampType--">timestampType</a></span>()</code>
+<div class="block">The timestamp type of this record</div>
+</td>
+</tr>
+<tr id="i9" 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/ConsumerRecord.html#topic--">topic</a></span>()</code>
+<div class="block">The topic this record is received from</div>
+</td>
+</tr>
+<tr id="i10" 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/ConsumerRecord.html#toString--">toString</a></span>()</code> </td>
+</tr>
+<tr id="i11" class="rowColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html#value--">value</a></span>()</code>
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+<h3>Methods inherited from class java.lang.Object</h3>
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+<pre>public static final long NO_TIMESTAMP</pre>
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+ int partition,
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+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a> value)</pre>
+<div class="block">Creates a record to be received from a specified topic and partition (provided for
+ compatibility with Kafka 0.9 before the message format supported timestamps and before
+ serialized metadata were exposed).</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>topic</code> - The topic this record is received from</dd>
+<dd><code>partition</code> - The partition of the topic this record is received from</dd>
+<dd><code>offset</code> - The offset of this record in the corresponding Kafka partition</dd>
+<dd><code>key</code> - The key of the record, if one exists (null is allowed)</dd>
+<dd><code>value</code> - The record contents</dd>
+</dl>
+</li>
+</ul>
+<a name="ConsumerRecord-java.lang.String-int-long-long-org.apache.kafka.common.record.TimestampType-long-int-int-java.lang.Object-java.lang.Object-">
+<!-- -->
+</a><a name="ConsumerRecord-java.lang.String-int-long-long-org.apache.kafka.common.record.TimestampType-long-int-int-K-V-">
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+<pre>public ConsumerRecord(java.lang.String topic,
+ int partition,
+ long offset,
+ long timestamp,
+ org.apache.kafka.common.record.TimestampType timestampType,
+ long checksum,
+ int serializedKeySize,
+ int serializedValueSize,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">K</a> key,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a> value)</pre>
+<div class="block">Creates a record to be received from a specified topic and partition (provided for
+ compatibility with Kafka 0.10 before the message format supported headers).</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>topic</code> - The topic this record is received from</dd>
+<dd><code>partition</code> - The partition of the topic this record is received from</dd>
+<dd><code>offset</code> - The offset of this record in the corresponding Kafka partition</dd>
+<dd><code>timestamp</code> - The timestamp of the record.</dd>
+<dd><code>timestampType</code> - The timestamp type</dd>
+<dd><code>checksum</code> - The checksum (CRC32) of the full record</dd>
+<dd><code>serializedKeySize</code> - The length of the serialized key</dd>
+<dd><code>serializedValueSize</code> - The length of the serialized value</dd>
+<dd><code>key</code> - The key of the record, if one exists (null is allowed)</dd>
+<dd><code>value</code> - The record contents</dd>
+</dl>
+</li>
+</ul>
+<a name="ConsumerRecord-java.lang.String-int-long-long-org.apache.kafka.common.record.TimestampType-java.lang.Long-int-int-java.lang.Object-java.lang.Object-org.apache.kafka.common.header.Headers-">
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+<pre>public ConsumerRecord(java.lang.String topic,
+ int partition,
+ long offset,
+ long timestamp,
+ org.apache.kafka.common.record.TimestampType timestampType,
+ java.lang.Long checksum,
+ int serializedKeySize,
+ int serializedValueSize,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">K</a> key,
+ <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a> value,
+ <a href="../../../../../org/apache/kafka/common/header/Headers.html" title="interface in org.apache.kafka.common.header">Headers</a> headers)</pre>
+<div class="block">Creates a record to be received from a specified topic and partition</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>topic</code> - The topic this record is received from</dd>
+<dd><code>partition</code> - The partition of the topic this record is received from</dd>
+<dd><code>offset</code> - The offset of this record in the corresponding Kafka partition</dd>
+<dd><code>timestamp</code> - The timestamp of the record.</dd>
+<dd><code>timestampType</code> - The timestamp type</dd>
+<dd><code>checksum</code> - The checksum (CRC32) of the full record</dd>
+<dd><code>serializedKeySize</code> - The length of the serialized key</dd>
+<dd><code>serializedValueSize</code> - The length of the serialized value</dd>
+<dd><code>key</code> - The key of the record, if one exists (null is allowed)</dd>
+<dd><code>value</code> - The record contents</dd>
+<dd><code>headers</code> - The headers of the record.</dd>
+</dl>
+</li>
+</ul>
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+</ul>
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+<h4>topic</h4>
+<pre>public java.lang.String topic()</pre>
+<div class="block">The topic this record is received from</div>
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+<!-- -->
+</a>
+<ul class="blockList">
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+<h4>partition</h4>
+<pre>public int partition()</pre>
+<div class="block">The partition from which this record is received</div>
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+<pre>public <a href="../../../../../org/apache/kafka/common/header/Headers.html" title="interface in org.apache.kafka.common.header">Headers</a> headers()</pre>
+<div class="block">The headers</div>
+</li>
+</ul>
+<a name="key--">
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+</a>
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+<h4>key</h4>
+<pre>public <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">K</a> key()</pre>
+<div class="block">The key (or null if no key is specified)</div>
+</li>
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+<a name="value--">
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+<pre>public <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="type parameter in ConsumerRecord">V</a> value()</pre>
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+<pre>public long offset()</pre>
+<div class="block">The position of this record in the corresponding Kafka partition.</div>
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+<pre>public long timestamp()</pre>
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+<h4>timestampType</h4>
+<pre>public org.apache.kafka.common.record.TimestampType timestampType()</pre>
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+</ul>
+<a name="checksum--">
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+<pre>@Deprecated
+public long checksum()</pre>
+<div class="block"><span class="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">As of Kafka 0.11.0. Because of the potential for message format conversion on the broker, the
+ checksum returned by the broker may not match what was computed by the producer.
+ It is therefore unsafe to depend on this checksum for end-to-end delivery guarantees. Additionally,
+ message format v2 does not include a record-level checksum (for performance, the record checksum
+ was replaced with a batch checksum). To maintain compatibility, a partial checksum computed from
+ the record timestamp, serialized key size, and serialized value size is returned instead, but
+ this should not be depended on for end-to-end reliability.</span></div>
+<div class="block">The checksum (CRC32) of the record.</div>
+</li>
+</ul>
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+<pre>public int serializedKeySize()</pre>
+<div class="block">The size of the serialized, uncompressed key in bytes. If key is null, the returned size
+ is -1.</div>
+</li>
+</ul>
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+<div class="block">The size of the serialized, uncompressed value in bytes. If value is null, the
+ returned size is -1.</div>
+</li>
+</ul>
+<a name="toString--">
+<!-- -->
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+<ul class="blockListLast">
+<li class="blockList">
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+<dd><code>toString</code> in class <code>java.lang.Object</code></dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
+<!-- ======= START OF BOTTOM NAVBAR ====== -->
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+<div>
+<ul class="subNavList">
+<li>Summary: </li>
+<li>Nested | </li>
+<li><a href="#field.summary">Field</a> | </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><a href="#field.detail">Field</a> | </li>
+<li><a href="#constructor.detail">Constr</a> | </li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.kafka.clients.consumer</div>
+<h2 title="Class ConsumerRecords" class="title">Class ConsumerRecords<K,V></h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.kafka.clients.consumer.ConsumerRecords<K,V></li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd>java.lang.Iterable<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><K,V>></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="typeNameLabel">ConsumerRecords<K,V></span>
+extends java.lang.Object
+implements java.lang.Iterable<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><K,V>></pre>
+<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. There is one <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer"><code>ConsumerRecord</code></a> list for every topic
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+<td class="colFirst"><code>static <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecords</a><java.lang.Object,java.lang.Object></code></td>
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+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
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+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html#count--">count</a></span>()</code>
+<div class="block">The number of records for all topics</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>static <K,V> <a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecords</a><K,V></code></td>
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+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html#isEmpty--">isEmpty</a></span>()</code> </td>
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+<td class="colFirst"><code>java.util.Iterator<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">K</a>,<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">V</a>>></code></td>
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+<td class="colFirst"><code>java.util.Set<<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/ConsumerRecords.html#partitions--">partitions</a></span>()</code>
+<div class="block">Get the partitions which have records contained in this record set.</div>
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+<tr id="i5" class="rowColor">
+<td class="colFirst"><code>java.lang.Iterable<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">K</a>,<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">V</a>>></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html#records-java.lang.String-">records</a></span>(java.lang.String topic)</code>
+<div class="block">Get just the records for the given topic</div>
+</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code>java.util.List<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">K</a>,<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">V</a>>></code></td>
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+<li class="blockList"><a name="method.detail">
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+<h3>Method Detail</h3>
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+<h4>records</h4>
+<pre>public java.util.List<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">K</a>,<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">V</a>>> records(<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a> partition)</pre>
+<div class="block">Get just the records for the given partition</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>partition</code> - The partition to get records for</dd>
+</dl>
+</li>
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+<h4>records</h4>
+<pre>public java.lang.Iterable<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">K</a>,<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">V</a>>> records(java.lang.String topic)</pre>
+<div class="block">Get just the records for the given topic</div>
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+</ul>
+<a name="partitions--">
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+<h4>partitions</h4>
+<pre>public java.util.Set<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>> partitions()</pre>
+<div class="block">Get the partitions which have records contained in this record set.</div>
+<dl>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the set of partitions with data in this record set (may be empty if no data was returned)</dd>
+</dl>
+</li>
+</ul>
+<a name="iterator--">
+<!-- -->
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+<h4>iterator</h4>
+<pre>public java.util.Iterator<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">K</a>,<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">V</a>>> iterator()</pre>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code>iterator</code> in interface <code>java.lang.Iterable<<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecord.html" title="class in org.apache.kafka.clients.consumer">ConsumerRecord</a><<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">K</a>,<a href="../../../../../org/apache/kafka/clients/consumer/ConsumerRecords.html" title="type parameter in ConsumerRecords">V</a>>></code></dd>
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+<pre>public int count()</pre>
+<div class="block">The number of records for all topics</div>
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+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
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+<h2 title="Class InvalidOffsetException" class="title">Class InvalidOffsetException</h2>
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+<ul class="inheritance">
+<li>java.lang.Object</li>
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+<li>java.lang.RuntimeException</li>
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+<li><a href="../../../../../org/apache/kafka/common/KafkaException.html" title="class in org.apache.kafka.common">org.apache.kafka.common.KafkaException</a></li>
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+<ul class="inheritance">
+<li>org.apache.kafka.clients.consumer.InvalidOffsetException</li>
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+<pre>public abstract class <span class="typeNameLabel">InvalidOffsetException</span>
+extends <a href="../../../../../org/apache/kafka/common/KafkaException.html" title="class in org.apache.kafka.common">KafkaException</a></pre>
+<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>
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+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../../org/apache/kafka/clients/consumer/NoOffsetForPartitionException.html" title="class in org.apache.kafka.clients.consumer"><code>NoOffsetForPartitionException</code></a>,
+<a href="../../../../../org/apache/kafka/clients/consumer/OffsetOutOfRangeException.html" title="class in org.apache.kafka.clients.consumer"><code>OffsetOutOfRangeException</code></a>,
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+<td class="colFirst"><code>abstract java.util.Set<<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>></code></td>
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