Package org.apache.pinot.broker.broker.helix

Class ClusterChangeMediator

java.lang.Object

org.apache.pinot.broker.broker.helix.ClusterChangeMediator

All Implemented Interfaces:

org.apache.helix.api.listeners.ExternalViewChangeListener, org.apache.helix.api.listeners.IdealStateChangeListener, org.apache.helix.api.listeners.InstanceConfigChangeListener, org.apache.helix.api.listeners.LiveInstanceChangeListener

public class ClusterChangeMediator
extends Object
implements org.apache.helix.api.listeners.IdealStateChangeListener, org.apache.helix.api.listeners.ExternalViewChangeListener, org.apache.helix.api.listeners.InstanceConfigChangeListener, org.apache.helix.api.listeners.LiveInstanceChangeListener

The ClusterChangeMediator handles the changes from Helix cluster.

If there is no change callback in 1 hour, proactively check changes so that the changes are getting processed even when callbacks stop working.

NOTE: disable Helix batch-mode and perform deduplication in this class. This can save us the extra threads for handling Helix batch-mode, and let us track the cluster change queue time.

NOTE: disable Helix pre-fetch to reduce the ZK accesses.

Constructor Summary

Constructors

Constructor	Description
ClusterChangeMediator(Map<org.apache.helix.HelixConstants.ChangeType,List<ClusterChangeHandler>> changeHandlersMap, org.apache.pinot.common.metrics.BrokerMetrics brokerMetrics)

Method Summary

Modifier and Type	Method	Description
void	onExternalViewChange(List<org.apache.helix.model.ExternalView> externalViewList, org.apache.helix.NotificationContext changeContext)
void	onIdealStateChange(List<org.apache.helix.model.IdealState> idealStateList, org.apache.helix.NotificationContext changeContext)
void	onInstanceConfigChange(List<org.apache.helix.model.InstanceConfig> instanceConfigs, org.apache.helix.NotificationContext changeContext)
void	onLiveInstanceChange(List<org.apache.helix.model.LiveInstance> liveInstances, org.apache.helix.NotificationContext changeContext)
void	start()	Starts the cluster change mediator.
void	stop()	Stops the cluster change mediator.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClusterChangeMediator

public ClusterChangeMediator(Map<org.apache.helix.HelixConstants.ChangeType,List<ClusterChangeHandler>> changeHandlersMap,
                             org.apache.pinot.common.metrics.BrokerMetrics brokerMetrics)

Method Detail

start

public void start()

Starts the cluster change mediator.

stop

public void stop()

Stops the cluster change mediator.

onIdealStateChange

public void onIdealStateChange(List<org.apache.helix.model.IdealState> idealStateList,
                               org.apache.helix.NotificationContext changeContext)
                        throws InterruptedException

Specified by:

onIdealStateChange in interface org.apache.helix.api.listeners.IdealStateChangeListener

Throws:

InterruptedException

onExternalViewChange

public void onExternalViewChange(List<org.apache.helix.model.ExternalView> externalViewList,
                                 org.apache.helix.NotificationContext changeContext)

Specified by:

onExternalViewChange in interface org.apache.helix.api.listeners.ExternalViewChangeListener

onInstanceConfigChange

public void onInstanceConfigChange(List<org.apache.helix.model.InstanceConfig> instanceConfigs,
                                   org.apache.helix.NotificationContext changeContext)

Specified by:

onInstanceConfigChange in interface org.apache.helix.api.listeners.InstanceConfigChangeListener

onLiveInstanceChange

public void onLiveInstanceChange(List<org.apache.helix.model.LiveInstance> liveInstances,
                                 org.apache.helix.NotificationContext changeContext)

Specified by:

onLiveInstanceChange in interface org.apache.helix.api.listeners.LiveInstanceChangeListener