kafka.javaapi.consumer

Interface ConsumerRebalanceListener

public interface ConsumerRebalanceListener

This listener is used for execution of tasks defined by user when a consumer rebalance occurs in ZookeeperConsumerConnector

Method Summary

Modifier and Type	Method and Description
void	beforeReleasingPartitions(java.util.Map<java.lang.String,java.util.Set<java.lang.Integer>> partitionOwnership) This method is called after all the fetcher threads are stopped but before the ownership of partitions are released.
void	beforeStartingFetchers(java.lang.String consumerId, java.util.Map<java.lang.String,java.util.Map<java.lang.Integer,kafka.consumer.ConsumerThreadId>> globalPartitionAssignment) This method is called after the new partition assignment is finished but before fetcher threads start.

Method Detail

beforeReleasingPartitions

void beforeReleasingPartitions(java.util.Map<java.lang.String,java.util.Set<java.lang.Integer>> partitionOwnership)

This method is called after all the fetcher threads are stopped but before the ownership of partitions are released. Depending on whether auto offset commit is enabled or not, offsets may or may not have been committed. This listener is initially added to prevent duplicate messages on consumer rebalance in mirror maker, where offset auto commit is disabled to prevent data loss. It could also be used in more general cases.

Parameters:

partitionOwnership - The partition this consumer currently owns.

beforeStartingFetchers

void beforeStartingFetchers(java.lang.String consumerId,
                            java.util.Map<java.lang.String,java.util.Map<java.lang.Integer,kafka.consumer.ConsumerThreadId>> globalPartitionAssignment)

This method is called after the new partition assignment is finished but before fetcher threads start. A map of new global partition assignment is passed in as parameter.

Parameters:

consumerId - The consumer Id string of the consumer invoking this callback.

globalPartitionAssignment - A Map[topic, Map[Partition, ConsumerThreadId]]. It is the global partition assignment of this consumer group.