Package 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	Description
ConsistentHashingStickyKeyConsumerSelector(int numberOfPoints)

Method Summary

Modifier and Type	Method	Description
void	addConsumer(Consumer consumer)	Add a new consumer.
Map<Consumer,List<org.apache.pulsar.client.api.Range>>	getConsumerKeyHashRanges()	Get key hash ranges handled by each consumer.
void	removeConsumer(Consumer consumer)	Remove the consumer.
Consumer	select(int hash)	Select a consumer by hash.

Methods inherited from class java.lang.Object

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

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

select

Constructor Details

ConsistentHashingStickyKeyConsumerSelector

public ConsistentHashingStickyKeyConsumerSelector(int numberOfPoints)

Method Details

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(int hash)

Description copied from interface: StickyKeyConsumerSelector

Select a consumer by hash.

Specified by:

select in interface StickyKeyConsumerSelector

Parameters:

hash - hash corresponding to sticky key

Returns:

consumer

getConsumerKeyHashRanges

public Map<Consumer,List<org.apache.pulsar.client.api.Range>> 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.