org.apache.pulsar.broker.service

Class ConsistentHashingStickyKeyConsumerSelector

java.lang.Object

org.apache.pulsar.broker.service.ConsistentHashingStickyKeyConsumerSelector

All Implemented Interfaces:

StickyKeyConsumerSelector

public class ConsistentHashingStickyKeyConsumerSelector
extends Object
implements StickyKeyConsumerSelector

This is a consumer selector based fixed hash range. The implementation uses consistent hashing to evenly split, the number of keys assigned to each consumer.

Field Summary

Fields inherited from interface org.apache.pulsar.broker.service.StickyKeyConsumerSelector

DEFAULT_RANGE_SIZE

Constructor Summary

Constructors

Constructor and Description
ConsistentHashingStickyKeyConsumerSelector(int numberOfPoints)

Method Summary

Modifier and Type	Method and Description
void	addConsumer(Consumer consumer) Add a new consumer
Map<String,List<String>>	getConsumerKeyHashRanges() Get key hash ranges handled by each consumer
void	removeConsumer(Consumer consumer) Remove the consumer
Consumer	select(byte[] stickyKey) Select a consumer by sticky key

Methods inherited from class java.lang.Object

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

Constructor Detail

ConsistentHashingStickyKeyConsumerSelector

public ConsistentHashingStickyKeyConsumerSelector(int numberOfPoints)

Method Detail

addConsumer

public void addConsumer(Consumer consumer)
                 throws BrokerServiceException.ConsumerAssignException

Description copied from interface: StickyKeyConsumerSelector

Add a new consumer

Specified by:

addConsumer in interface StickyKeyConsumerSelector

Parameters:

consumer - new consumer

Throws:

BrokerServiceException.ConsumerAssignException

removeConsumer

public void removeConsumer(Consumer consumer)

Description copied from interface: StickyKeyConsumerSelector

Remove the consumer

Specified by:

removeConsumer in interface StickyKeyConsumerSelector

Parameters:

consumer - consumer to be removed

select

public Consumer select(byte[] stickyKey)

Description copied from interface: StickyKeyConsumerSelector

Select a consumer by sticky key

Specified by:

select in interface StickyKeyConsumerSelector

Parameters:

stickyKey - sticky key

Returns:

consumer

getConsumerKeyHashRanges

public Map<String,List<String>> getConsumerKeyHashRanges()

Description copied from interface: StickyKeyConsumerSelector

Get key hash ranges handled by each consumer

Specified by:

getConsumerKeyHashRanges in interface StickyKeyConsumerSelector

Returns:

A map where key is a consumer name and value is list of hash range it receiving message for.