org.apache.flink.runtime.leaderretrieval

Class ZooKeeperLeaderRetrievalDriver

java.lang.Object

org.apache.flink.runtime.leaderretrieval.ZooKeeperLeaderRetrievalDriver

All Implemented Interfaces:

AutoCloseable, LeaderRetrievalDriver

public class ZooKeeperLeaderRetrievalDriver
extends Object
implements LeaderRetrievalDriver

The counterpart to the ZooKeeperLeaderElectionDriver. LeaderRetrievalService implementation for Zookeeper. It retrieves the current leader which has been elected by the ZooKeeperLeaderElectionDriver. The leader address as well as the current leader session ID is retrieved from ZooKeeper.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ZooKeeperLeaderRetrievalDriver.LeaderInformationClearancePolicy Policy when to clear the leader information and to notify the listener about it.

Constructor Summary

Constructors

Constructor and Description

ZooKeeperLeaderRetrievalDriver(org.apache.flink.shaded.curator5.org.apache.curator.framework.CuratorFramework client, String path, LeaderRetrievalEventHandler leaderRetrievalEventHandler, ZooKeeperLeaderRetrievalDriver.LeaderInformationClearancePolicy leaderInformationClearancePolicy, FatalErrorHandler fatalErrorHandler) Creates a leader retrieval service which uses ZooKeeper to retrieve the leader information.

Method Summary

Modifier and Type	Method and Description
void	close()
String	getConnectionInformationPath()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ZooKeeperLeaderRetrievalDriver

public ZooKeeperLeaderRetrievalDriver(org.apache.flink.shaded.curator5.org.apache.curator.framework.CuratorFramework client,
                                      String path,
                                      LeaderRetrievalEventHandler leaderRetrievalEventHandler,
                                      ZooKeeperLeaderRetrievalDriver.LeaderInformationClearancePolicy leaderInformationClearancePolicy,
                                      FatalErrorHandler fatalErrorHandler)
                               throws Exception

Creates a leader retrieval service which uses ZooKeeper to retrieve the leader information.

Parameters:

client - Client which constitutes the connection to the ZooKeeper quorum

path - Path of the ZooKeeper node which contains the leader information

leaderRetrievalEventHandler - Handler to notify the leader changes.

leaderInformationClearancePolicy - leaderInformationClearancePolicy controls when the leader information is being cleared

fatalErrorHandler - Fatal error handler

Throws:

Exception

Method Detail

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception

toString

public String toString()

Overrides:

toString in class Object

getConnectionInformationPath

@VisibleForTesting
public String getConnectionInformationPath()