org.apache.flink.runtime.leaderretrieval

Class ZooKeeperLeaderRetrievalDriver

java.lang.Object

org.apache.flink.runtime.leaderretrieval.ZooKeeperLeaderRetrievalDriver

All Implemented Interfaces:

LeaderRetrievalDriver, org.apache.flink.shaded.curator4.org.apache.curator.framework.api.UnhandledErrorListener, org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.cache.NodeCacheListener

public class ZooKeeperLeaderRetrievalDriver
extends Object
implements LeaderRetrievalDriver, org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.cache.NodeCacheListener, org.apache.flink.shaded.curator4.org.apache.curator.framework.api.UnhandledErrorListener

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.

Constructor Summary

Constructors

Constructor and Description
ZooKeeperLeaderRetrievalDriver(org.apache.flink.shaded.curator4.org.apache.curator.framework.CuratorFramework client, String retrievalPath, LeaderRetrievalEventHandler leaderRetrievalEventHandler, 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() Close the services used for leader retrieval.
void	nodeChanged()
String	toString()
void	unhandledError(String s, Throwable throwable)

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.curator4.org.apache.curator.framework.CuratorFramework client,
                                      String retrievalPath,
                                      LeaderRetrievalEventHandler leaderRetrievalEventHandler,
                                      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

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

leaderRetrievalEventHandler - Handler to notify the leader changes.

fatalErrorHandler - Fatal error handler

Throws:

Exception

Method Detail

close

public void close()
           throws Exception

Description copied from interface: LeaderRetrievalDriver

Close the services used for leader retrieval.

Specified by:

close in interface LeaderRetrievalDriver

Throws:

Exception

nodeChanged

public void nodeChanged()

Specified by:

nodeChanged in interface org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.cache.NodeCacheListener

unhandledError

public void unhandledError(String s,
                           Throwable throwable)

Specified by:

unhandledError in interface org.apache.flink.shaded.curator4.org.apache.curator.framework.api.UnhandledErrorListener

toString

public String toString()

Overrides:

toString in class Object