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| <div class="subTitle">org.apache.beam.sdk.io.kafka</div> |
| <h2 title="Class KafkaIO" class="title">Class KafkaIO</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.beam.sdk.io.kafka.KafkaIO</li> |
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| <pre><a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SOURCE_SINK">SOURCE_SINK</a>) |
| public class <span class="typeNameLabel">KafkaIO</span> |
| extends java.lang.Object</pre> |
| <div class="block">An unbounded source and a sink for <a href="http://kafka.apache.org/">Kafka</a> topics. |
| |
| <h3>Reading from Kafka topics</h3> |
| |
| <p>KafkaIO source returns unbounded collection of Kafka records as <code>PCollection<KafkaRecord<K, V>></code>. A <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaRecord.html" title="class in org.apache.beam.sdk.io.kafka"><code>KafkaRecord</code></a> includes basic metadata like |
| topic-partition and offset, along with key and value associated with a Kafka record. |
| |
| <p>Although most applications consume a single topic, the source can be configured to consume |
| multiple topics or even a specific set of <code>TopicPartition</code>s. |
| |
| <p>To configure a Kafka source, you must specify at the minimum Kafka <tt>bootstrapServers</tt>, |
| one or more topics to consume, and key and value deserializers. For example: |
| |
| <pre><code> |
| pipeline |
| .apply(KafkaIO.<Long, String>read() |
| .withBootstrapServers("broker_1:9092,broker_2:9092") |
| .withTopic("my_topic") // use withTopics(List<String>) to read from multiple topics. |
| .withKeyDeserializer(LongDeserializer.class) |
| .withValueDeserializer(StringDeserializer.class) |
| |
| // Above four are required configuration. returns PCollection<KafkaRecord<Long, String>> |
| |
| // Rest of the settings are optional : |
| |
| // you can further customize KafkaConsumer used to read the records by adding more |
| // settings for ConsumerConfig. e.g : |
| .updateConsumerProperties(ImmutableMap.of("group.id", "my_beam_app_1")) |
| |
| // set event times and watermark based on 'LogAppendTime'. To provide a custom |
| // policy see withTimestampPolicyFactory(). withProcessingTime() is the default. |
| // Use withCreateTime() with topics that have 'CreateTime' timestamps. |
| .withLogAppendTime() |
| |
| // restrict reader to committed messages on Kafka (see method documentation). |
| .withReadCommitted() |
| |
| // offset consumed by the pipeline can be committed back. |
| .commitOffsetsInFinalize() |
| |
| // finally, if you don't need Kafka metadata, you can drop it.g |
| .withoutMetadata() // PCollection<KV<Long, String>> |
| ) |
| .apply(Values.<String>create()) // PCollection<String> |
| ... |
| </code></pre> |
| |
| <p>Kafka provides deserializers for common types in <code>org.apache.kafka.common.serialization</code>. In addition to deserializers, Beam runners need <a href="../../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders"><code>Coder</code></a> to materialize key and value objects if necessary. In most cases, you don't need to |
| specify <a href="../../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders"><code>Coder</code></a> for key and value in the resulting collection because the coders are |
| inferred from deserializer types. However, in cases when coder inference fails, they can be |
| specified explicitly along with deserializers using <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html#withKeyDeserializerAndCoder-java.lang.Class-org.apache.beam.sdk.coders.Coder-"><code>KafkaIO.Read.withKeyDeserializerAndCoder(Class, Coder)</code></a> and <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html#withValueDeserializerAndCoder-java.lang.Class-org.apache.beam.sdk.coders.Coder-"><code>KafkaIO.Read.withValueDeserializerAndCoder(Class, Coder)</code></a>. Note that Kafka messages are interpreted using |
| key and value <i>deserializers</i>. |
| |
| <h3>Partition Assignment and Checkpointing</h3> |
| |
| The Kafka partitions are evenly distributed among splits (workers). |
| |
| <p>Checkpointing is fully supported and each split can resume from previous checkpoint (to the |
| extent supported by runner). See <code>KafkaUnboundedSource.split(int, PipelineOptions)</code> for |
| more details on splits and checkpoint support. |
| |
| <p>When the pipeline starts for the first time, or without any checkpoint, the source starts |
| consuming from the <em>latest</em> offsets. You can override this behavior to consume from the |
| beginning by setting appropriate appropriate properties in <code>ConsumerConfig</code>, through <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html#updateConsumerProperties-java.util.Map-"><code>KafkaIO.Read.updateConsumerProperties(Map)</code></a>. You can also enable offset auto_commit in Kafka to resume |
| from last committed. |
| |
| <p>In summary, KafkaIO.read follows below sequence to set initial offset:<br> |
| 1. <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaCheckpointMark.html" title="class in org.apache.beam.sdk.io.kafka"><code>KafkaCheckpointMark</code></a> provided by runner;<br> |
| 2. Consumer offset stored in Kafka when <code>ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG = true</code>; |
| <br> |
| 3. Start from <em>latest</em> offset by default; |
| |
| <h3>Writing to Kafka</h3> |
| |
| <p>KafkaIO sink supports writing key-value pairs to a Kafka topic. Users can also write just the |
| values. To configure a Kafka sink, you must specify at the minimum Kafka |
| <tt>bootstrapServers</tt>, the topic to write to, and key and value serializers. For example: |
| |
| <pre><code> |
| PCollection<KV<Long, String>> kvColl = ...; |
| kvColl.apply(KafkaIO.<Long, String>write() |
| .withBootstrapServers("broker_1:9092,broker_2:9092") |
| .withTopic("results") |
| |
| .withKeySerializer(LongSerializer.class) |
| .withValueSerializer(StringSerializer.class) |
| |
| // You can further customize KafkaProducer used to write the records by adding more |
| // settings for ProducerConfig. e.g, to enable compression : |
| .updateProducerProperties(ImmutableMap.of("compression.type", "gzip")) |
| |
| // You set publish timestamp for the Kafka records. |
| .withInputTimestamp() // element timestamp is used while publishing to Kafka |
| // or you can also set a custom timestamp with a function. |
| .withPublishTimestampFunction((elem, elemTs) -> ...) |
| |
| // Optionally enable exactly-once sink (on supported runners). See JavaDoc for withEOS(). |
| .withEOS(20, "eos-sink-group-id"); |
| ); |
| </code></pre> |
| |
| <p>Often you might want to write just values without any keys to Kafka. Use <code>values()</code> to |
| write records with default empty(null) key: |
| |
| <pre><code> |
| PCollection<String> strings = ...; |
| strings.apply(KafkaIO.<Void, String>write() |
| .withBootstrapServers("broker_1:9092,broker_2:9092") |
| .withTopic("results") |
| .withValueSerializer(StringSerializer.class) // just need serializer for value |
| .values() |
| ); |
| </code></pre> |
| |
| <h3>Advanced Kafka Configuration</h3> |
| |
| KafkaIO allows setting most of the properties in <code>ConsumerConfig</code> for source or in <code>ProducerConfig</code> for sink. E.g. if you would like to enable offset <em>auto commit</em> (for |
| external monitoring or other purposes), you can set <tt>"group.id"</tt>, |
| <tt>"enable.auto.commit"</tt>, etc. |
| |
| <h3>Event Timestamps and Watermark</h3> |
| |
| By default, record timestamp (event time) is set to processing time in KafkaIO reader and source |
| watermark is current wall time. If a topic has Kafka server-side ingestion timestamp enabled |
| ('LogAppendTime'), it can enabled with <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html#withLogAppendTime--"><code>KafkaIO.Read.withLogAppendTime()</code></a>. A custom timestamp |
| policy can be provided by implementing <a href="../../../../../../org/apache/beam/sdk/io/kafka/TimestampPolicyFactory.html" title="interface in org.apache.beam.sdk.io.kafka"><code>TimestampPolicyFactory</code></a>. See <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html#withTimestampPolicyFactory-org.apache.beam.sdk.io.kafka.TimestampPolicyFactory-"><code>KafkaIO.Read.withTimestampPolicyFactory(TimestampPolicyFactory)</code></a> for more information. |
| |
| <h3>Supported Kafka Client Versions</h3> |
| |
| KafkaIO relies on <i>kafka-clients</i> for all its interactions with the Kafka cluster. |
| <i>kafka-clients</i> versions 0.10.1 and newer are supported at runtime. The older versions 0.9.x |
| - 0.10.0.0 are also supported, but are deprecated and likely be removed in near future. Please |
| ensure that the version included with the application is compatible with the version of your |
| Kafka cluster. Kafka client usually fails to initialize with a clear error message in case of |
| incompatibility.</div> |
| </li> |
| </ul> |
| </div> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Read</a><<a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="type parameter in KafkaIO.Read">K</a>,<a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="type parameter in KafkaIO.Read">V</a>></span></code> |
| <div class="block">A <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> to read from Kafka topics.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.TypedWithoutMetadata.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.TypedWithoutMetadata</a><<a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.TypedWithoutMetadata.html" title="type parameter in KafkaIO.TypedWithoutMetadata">K</a>,<a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.TypedWithoutMetadata.html" title="type parameter in KafkaIO.TypedWithoutMetadata">V</a>></span></code> |
| <div class="block">A <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> to read from Kafka topics.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Write</a><<a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html" title="type parameter in KafkaIO.Write">K</a>,<a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html" title="type parameter in KafkaIO.Write">V</a>></span></code> |
| <div class="block">A <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> to write to a Kafka topic.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static 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>static <K,V> <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Read</a><K,V></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.html#read--">read</a></span>()</code> |
| <div class="block">Creates an uninitialized <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="class in org.apache.beam.sdk.io.kafka"><code>KafkaIO.Read</code></a> <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Read</a><byte[],byte[]></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.html#readBytes--">readBytes</a></span>()</code> |
| <div class="block">A specific instance of uninitialized <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.html#read--"><code>read()</code></a> where key and values are bytes.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <K,V> <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Write</a><K,V></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.html#write--">write</a></span>()</code> |
| <div class="block">Creates an uninitialized <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html" title="class in org.apache.beam.sdk.io.kafka"><code>KafkaIO.Write</code></a> <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a>.</div> |
| </td> |
| </tr> |
| </table> |
| <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> |
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| <a name="readBytes--"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>readBytes</h4> |
| <pre>public static <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Read</a><byte[],byte[]> readBytes()</pre> |
| <div class="block">A specific instance of uninitialized <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.html#read--"><code>read()</code></a> where key and values are bytes. See |
| #read().</div> |
| </li> |
| </ul> |
| <a name="read--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>read</h4> |
| <pre>public static <K,V> <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Read</a><K,V> read()</pre> |
| <div class="block">Creates an uninitialized <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html" title="class in org.apache.beam.sdk.io.kafka"><code>KafkaIO.Read</code></a> <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a>. Before use, basic Kafka configuration |
| should set with <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html#withBootstrapServers-java.lang.String-"><code>KafkaIO.Read.withBootstrapServers(String)</code></a> and <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Read.html#withTopics-java.util.List-"><code>KafkaIO.Read.withTopics(List)</code></a>. |
| Other optional settings include key and value <code>Deserializer</code>s, custom timestamp and |
| watermark functions.</div> |
| </li> |
| </ul> |
| <a name="write--"> |
| <!-- --> |
| </a> |
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| <h4>write</h4> |
| <pre>public static <K,V> <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html" title="class in org.apache.beam.sdk.io.kafka">KafkaIO.Write</a><K,V> write()</pre> |
| <div class="block">Creates an uninitialized <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html" title="class in org.apache.beam.sdk.io.kafka"><code>KafkaIO.Write</code></a> <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a>. Before use, Kafka configuration |
| should be set with <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html#withBootstrapServers-java.lang.String-"><code>KafkaIO.Write.withBootstrapServers(String)</code></a> and <a href="../../../../../../org/apache/beam/sdk/io/kafka/KafkaIO.Write.html#withTopic-java.lang.String-"><code>KafkaIO.Write.withTopic(java.lang.String)</code></a> along |
| with <code>Deserializer</code>s for (optional) key and values.</div> |
| </li> |
| </ul> |
| </li> |
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