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| <div class="section" id="module-apache_beam.io.kafka"> |
| <span id="apache-beam-io-kafka-module"></span><h1>apache_beam.io.kafka module<a class="headerlink" href="#module-apache_beam.io.kafka" title="Permalink to this headline">¶</a></h1> |
| <dl class="docutils"> |
| <dt>Unbounded source and sink transforms for</dt> |
| <dd><a class="reference external" href="href="http://kafka.apache.org/">Kafka</a>.</dd> |
| </dl> |
| <p>These transforms are currently supported by Beam portable runners (for |
| example, portable Flink and Spark) as well as Dataflow runner.</p> |
| <p><strong>Setup</strong></p> |
| <p>Transforms provided in this module are cross-language transforms |
| implemented in the Beam Java SDK. During the pipeline construction, Python SDK |
| will connect to a Java expansion service to expand these transforms. |
| To facilitate this, a small amount of setup is needed before using these |
| transforms in a Beam Python pipeline.</p> |
| <p>There are several ways to setup cross-language Kafka transforms.</p> |
| <ul class="simple"> |
| <li>Option 1: use the default expansion service</li> |
| <li>Option 2: specify a custom expansion service</li> |
| </ul> |
| <p>See below for details regarding each of these options.</p> |
| <p><em>Option 1: Use the default expansion service</em></p> |
| <p>This is the recommended and easiest setup option for using Python Kafka |
| transforms. This option is only available for Beam 2.22.0 and later.</p> |
| <p>This option requires following pre-requisites before running the Beam |
| pipeline.</p> |
| <ul class="simple"> |
| <li>Install Java runtime in the computer from where the pipeline is constructed |
| and make sure that ‘java’ command is available.</li> |
| </ul> |
| <p>In this option, Python SDK will either download (for released Beam version) or |
| build (when running from a Beam Git clone) a expansion service jar and use |
| that to expand transforms. Currently Kafka transforms use the |
| ‘beam-sdks-java-io-expansion-service’ jar for this purpose.</p> |
| <p><em>Option 2: specify a custom expansion service</em></p> |
| <p>In this option, you startup your own expansion service and provide that as |
| a parameter when using the transforms provided in this module.</p> |
| <p>This option requires following pre-requisites before running the Beam |
| pipeline.</p> |
| <ul class="simple"> |
| <li>Startup your own expansion service.</li> |
| <li>Update your pipeline to provide the expansion service address when |
| initiating Kafka transforms provided in this module.</li> |
| </ul> |
| <p>Flink Users can use the built-in Expansion Service of the Flink Runner’s |
| Job Server. If you start Flink’s Job Server, the expansion service will be |
| started on port 8097. For a different address, please set the |
| expansion_service parameter.</p> |
| <p><strong>More information</strong></p> |
| <p>For more information regarding cross-language transforms see: |
| - <a class="reference external" href="https://beam.apache.org/roadmap/portability/">https://beam.apache.org/roadmap/portability/</a></p> |
| <p>For more information specific to Flink runner see: |
| - <a class="reference external" href="https://beam.apache.org/documentation/runners/flink/">https://beam.apache.org/documentation/runners/flink/</a></p> |
| <dl class="class"> |
| <dt id="apache_beam.io.kafka.ReadFromKafkaSchema"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.kafka.</code><code class="descname">ReadFromKafkaSchema</code><span class="sig-paren">(</span><em>consumer_config</em>, <em>topics</em>, <em>key_deserializer</em>, <em>value_deserializer</em><span class="sig-paren">)</span><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafkaSchema" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#tuple" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">tuple</span></code></a></p> |
| <p>Create new instance of ReadFromKafkaSchema(consumer_config, topics, key_deserializer, value_deserializer)</p> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.ReadFromKafkaSchema.consumer_config"> |
| <code class="descname">consumer_config</code><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafkaSchema.consumer_config" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 0</p> |
| </dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.ReadFromKafkaSchema.key_deserializer"> |
| <code class="descname">key_deserializer</code><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafkaSchema.key_deserializer" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 2</p> |
| </dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.ReadFromKafkaSchema.topics"> |
| <code class="descname">topics</code><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafkaSchema.topics" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 1</p> |
| </dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.ReadFromKafkaSchema.value_deserializer"> |
| <code class="descname">value_deserializer</code><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafkaSchema.value_deserializer" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 3</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="apache_beam.io.kafka.default_io_expansion_service"> |
| <code class="descclassname">apache_beam.io.kafka.</code><code class="descname">default_io_expansion_service</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/kafka.html#default_io_expansion_service"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.kafka.default_io_expansion_service" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.kafka.ReadFromKafka"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.kafka.</code><code class="descname">ReadFromKafka</code><span class="sig-paren">(</span><em>consumer_config</em>, <em>topics</em>, <em>key_deserializer='org.apache.kafka.common.serialization.ByteArrayDeserializer'</em>, <em>value_deserializer='org.apache.kafka.common.serialization.ByteArrayDeserializer'</em>, <em>expansion_service=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/kafka.html#ReadFromKafka"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafka" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.external.html#apache_beam.transforms.external.ExternalTransform" title="apache_beam.transforms.external.ExternalTransform"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.external.ExternalTransform</span></code></a></p> |
| <p>An external PTransform which reads from Kafka and returns a KV pair for |
| each item in the specified Kafka topics. If no Kafka Deserializer for |
| key/value is provided, then the data will be returned as a raw byte array.</p> |
| <p>Experimental; no backwards compatibility guarantees.</p> |
| <p>Initializes a read operation from Kafka.</p> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> |
| <li><strong>consumer_config</strong> – A dictionary containing the consumer configuration.</li> |
| <li><strong>topics</strong> – A list of topic strings.</li> |
| <li><strong>key_deserializer</strong> – A fully-qualified Java class name of a Kafka |
| Deserializer for the topic’s key, e.g. |
| ‘org.apache.kafka.common. |
| serialization.LongDeserializer’. |
| Default: ‘org.apache.kafka.common. |
| serialization.ByteArrayDeserializer’.</li> |
| <li><strong>value_deserializer</strong> – A fully-qualified Java class name of a Kafka |
| Deserializer for the topic’s value, e.g. |
| ‘org.apache.kafka.common. |
| serialization.LongDeserializer’. |
| Default: ‘org.apache.kafka.common. |
| serialization.ByteArrayDeserializer’.</li> |
| <li><strong>expansion_service</strong> – The address (host:port) of the ExpansionService.</li> |
| </ul> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.ReadFromKafka.byte_array_deserializer"> |
| <code class="descname">byte_array_deserializer</code><em class="property"> = 'org.apache.kafka.common.serialization.ByteArrayDeserializer'</em><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafka.byte_array_deserializer" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.ReadFromKafka.URN"> |
| <code class="descname">URN</code><em class="property"> = 'beam:external:java:kafka:read:v1'</em><a class="headerlink" href="#apache_beam.io.kafka.ReadFromKafka.URN" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.kafka.WriteToKafkaSchema"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.kafka.</code><code class="descname">WriteToKafkaSchema</code><span class="sig-paren">(</span><em>producer_config</em>, <em>topic</em>, <em>key_serializer</em>, <em>value_serializer</em><span class="sig-paren">)</span><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafkaSchema" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#tuple" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">tuple</span></code></a></p> |
| <p>Create new instance of WriteToKafkaSchema(producer_config, topic, key_serializer, value_serializer)</p> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.WriteToKafkaSchema.key_serializer"> |
| <code class="descname">key_serializer</code><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafkaSchema.key_serializer" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 2</p> |
| </dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.WriteToKafkaSchema.producer_config"> |
| <code class="descname">producer_config</code><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafkaSchema.producer_config" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 0</p> |
| </dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.WriteToKafkaSchema.topic"> |
| <code class="descname">topic</code><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafkaSchema.topic" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 1</p> |
| </dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.WriteToKafkaSchema.value_serializer"> |
| <code class="descname">value_serializer</code><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafkaSchema.value_serializer" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Alias for field number 3</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.kafka.WriteToKafka"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.kafka.</code><code class="descname">WriteToKafka</code><span class="sig-paren">(</span><em>producer_config</em>, <em>topic</em>, <em>key_serializer='org.apache.kafka.common.serialization.ByteArraySerializer'</em>, <em>value_serializer='org.apache.kafka.common.serialization.ByteArraySerializer'</em>, <em>expansion_service=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/kafka.html#WriteToKafka"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafka" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.external.html#apache_beam.transforms.external.ExternalTransform" title="apache_beam.transforms.external.ExternalTransform"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.external.ExternalTransform</span></code></a></p> |
| <p>An external PTransform which writes KV data to a specified Kafka topic. |
| If no Kafka Serializer for key/value is provided, then key/value are |
| assumed to be byte arrays.</p> |
| <p>Experimental; no backwards compatibility guarantees.</p> |
| <p>Initializes a write operation to Kafka.</p> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> |
| <li><strong>producer_config</strong> – A dictionary containing the producer configuration.</li> |
| <li><strong>topic</strong> – A Kafka topic name.</li> |
| <li><strong>key_deserializer</strong> – A fully-qualified Java class name of a Kafka |
| Serializer for the topic’s key, e.g. |
| ‘org.apache.kafka.common. |
| serialization.LongSerializer’. |
| Default: ‘org.apache.kafka.common. |
| serialization.ByteArraySerializer’.</li> |
| <li><strong>value_deserializer</strong> – A fully-qualified Java class name of a Kafka |
| Serializer for the topic’s value, e.g. |
| ‘org.apache.kafka.common. |
| serialization.LongSerializer’. |
| Default: ‘org.apache.kafka.common. |
| serialization.ByteArraySerializer’.</li> |
| <li><strong>expansion_service</strong> – The address (host:port) of the ExpansionService.</li> |
| </ul> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.WriteToKafka.byte_array_serializer"> |
| <code class="descname">byte_array_serializer</code><em class="property"> = 'org.apache.kafka.common.serialization.ByteArraySerializer'</em><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafka.byte_array_serializer" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="attribute"> |
| <dt id="apache_beam.io.kafka.WriteToKafka.URN"> |
| <code class="descname">URN</code><em class="property"> = 'beam:external:java:kafka:write:v1'</em><a class="headerlink" href="#apache_beam.io.kafka.WriteToKafka.URN" title="Permalink to this definition">¶</a></dt> |
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