org.apache.beam.sdk.io.kafka

Class KafkaIO.Write<K,V>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<KV<K,V>>,PDone>

org.apache.beam.sdk.io.kafka.KafkaIO.Write<K,V>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

KafkaIO

public abstract static class KafkaIO.Write<K,V>
extends PTransform<PCollection<KV<K,V>>,PDone>

A PTransform to write to a Kafka topic. See KafkaIO for more information on usage and configuration.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name

Constructor Summary

Constructors

Constructor and Description
Write()

Method Summary

Modifier and Type	Method and Description
PDone	expand(PCollection<KV<K,V>> input) Applies this PTransform on the given InputT, and returns its Output.
void	populateDisplayData(DisplayData.Builder builder) Register display data for the given transform or component.
KafkaIO.Write<K,V>	updateProducerProperties(java.util.Map<java.lang.String,java.lang.Object> configUpdates) Adds the given producer properties, overriding old values of properties with the same key.
void	validate(PipelineOptions options) Called before running the Pipeline to verify this transform is fully and correctly specified.
PTransform<PCollection<V>,PDone>	values() Writes just the values to Kafka.
KafkaIO.Write<K,V>	withBootstrapServers(java.lang.String bootstrapServers) Returns a new KafkaIO.Write transform with Kafka producer pointing to bootstrapServers.
KafkaIO.Write<K,V>	withKeySerializer(java.lang.Class<? extends org.apache.kafka.common.serialization.Serializer<K>> keySerializer) Sets a Serializer for serializing key (if any) to bytes.
KafkaIO.Write<K,V>	withProducerFactoryFn(SerializableFunction<java.util.Map<java.lang.String,java.lang.Object>,org.apache.kafka.clients.producer.Producer<K,V>> producerFactoryFn) Sets a custom function to create Kafka producer.
KafkaIO.Write<K,V>	withTopic(java.lang.String topic) Sets the Kafka topic to write to.
KafkaIO.Write<K,V>	withValueSerializer(java.lang.Class<? extends org.apache.kafka.common.serialization.Serializer<V>> valueSerializer) Sets a Serializer for serializing value to bytes.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Write

public Write()

Method Detail

withBootstrapServers

public KafkaIO.Write<K,V> withBootstrapServers(java.lang.String bootstrapServers)

Returns a new KafkaIO.Write transform with Kafka producer pointing to bootstrapServers.

withTopic

public KafkaIO.Write<K,V> withTopic(java.lang.String topic)

Sets the Kafka topic to write to.

withKeySerializer

public KafkaIO.Write<K,V> withKeySerializer(java.lang.Class<? extends org.apache.kafka.common.serialization.Serializer<K>> keySerializer)

Sets a Serializer for serializing key (if any) to bytes.

A key is optional while writing to Kafka. Note when a key is set, its hash is used to determine partition in Kafka (see ProducerRecord for more details).

withValueSerializer

public KafkaIO.Write<K,V> withValueSerializer(java.lang.Class<? extends org.apache.kafka.common.serialization.Serializer<V>> valueSerializer)

Sets a Serializer for serializing value to bytes.

updateProducerProperties

public KafkaIO.Write<K,V> updateProducerProperties(java.util.Map<java.lang.String,java.lang.Object> configUpdates)

Adds the given producer properties, overriding old values of properties with the same key.

withProducerFactoryFn

public KafkaIO.Write<K,V> withProducerFactoryFn(SerializableFunction<java.util.Map<java.lang.String,java.lang.Object>,org.apache.kafka.clients.producer.Producer<K,V>> producerFactoryFn)

Sets a custom function to create Kafka producer. Primarily used for tests. Default is KafkaProducer

values

public PTransform<PCollection<V>,PDone> values()

Writes just the values to Kafka. This is useful for writing collections of values rather thank KVs.

expand

public PDone expand(PCollection<KV<K,V>> input)

Description copied from class: PTransform

Applies this PTransform on the given InputT, and returns its Output.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PCollection<KV<K,V>>,PDone>

validate

public void validate(PipelineOptions options)

Description copied from class: PTransform

Called before running the Pipeline to verify this transform is fully and correctly specified.

By default, does nothing.

Overrides:

validate in class PTransform<PCollection<KV<K,V>>,PDone>

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Description copied from class: PTransform

Register display data for the given transform or component.

populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

By default, does not register any display data. Implementors may override this method to provide their own display data.

Specified by:

populateDisplayData in interface HasDisplayData

Overrides:

populateDisplayData in class PTransform<PCollection<KV<K,V>>,PDone>

Parameters:

builder - The builder to populate with display data.

See Also:

HasDisplayData