Package org.apache.kafka.clients.producer

Class RoundRobinPartitioner

java.lang.Object

org.apache.kafka.clients.producer.RoundRobinPartitioner

All Implemented Interfaces:

Closeable, AutoCloseable, Partitioner, Configurable

public class RoundRobinPartitioner
extends Object
implements Partitioner

The "Round-Robin" partitioner This partitioning strategy can be used when user wants to distribute the writes to all partitions equally. This is the behaviour regardless of record key hash.

Constructor Summary

Constructors

Constructor	Description
RoundRobinPartitioner()

Method Summary

Modifier and Type	Method	Description
void	close()	This is called when partitioner is closed.
void	configure(Map<String,?> configs)	Configure this class with the given key-value pairs
void	onNewBatch(String topic, Cluster cluster, int prevPartition)	Note this method is only implemented in DefaultPartitioner and UniformStickyPartitioner which are now deprecated.
int	partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster)	Compute the partition for the given record.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

RoundRobinPartitioner

public RoundRobinPartitioner()

Method Details

configure

public void configure(Map<String,?> configs)

Description copied from interface: Configurable

Configure this class with the given key-value pairs

Specified by:

configure in interface Configurable

partition

public int partition(String topic,
 Object key,
 byte[] keyBytes,
 Object value,
 byte[] valueBytes,
 Cluster cluster)

Compute the partition for the given record.

Specified by:

partition in interface Partitioner

Parameters:

topic - The topic name

key - The key to partition on (or null if no key)

keyBytes - serialized key to partition on (or null if no key)

value - The value to partition on or null

valueBytes - serialized value to partition on or null

cluster - The current cluster metadata

onNewBatch

public void onNewBatch(String topic,
 Cluster cluster,
 int prevPartition)

Description copied from interface: Partitioner

Note this method is only implemented in DefaultPartitioner and UniformStickyPartitioner which are now deprecated. See KIP-794 for more info.

Notifies the partitioner a new batch is about to be created. When using the sticky partitioner, this method can change the chosen sticky partition for the new batch.

After onNewBatch, the Partitioner.partition(String, Object, byte[], Object, byte[], Cluster) method is called again which allows the implementation to "redirect" the message on new batch creation.

Specified by:

onNewBatch in interface Partitioner

Parameters:

topic - The topic name

cluster - The current cluster metadata

prevPartition - The partition previously selected for the record that triggered a new batch

close

public void close()

Description copied from interface: Partitioner

This is called when partitioner is closed.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface Partitioner