org.apache.hadoop.hbase.master

Class ActiveMasterManager

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

org.apache.hadoop.hbase.master.ActiveMasterManager

@InterfaceAudience.Private
public class ActiveMasterManager
extends ZooKeeperListener

Handles everything on master-side related to master election.

Listens and responds to ZooKeeper notifications on the master znode, both nodeCreated and nodeDeleted.

Contains blocking methods which will hold up backup masters, waiting for the active master to fail.

This class is instantiated in the HMaster constructor and the method #blockUntilBecomingActiveMaster() is called to wait until becoming the active master of the cluster.

Field Summary

Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

watcher

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isActiveMaster()
void	nodeCreated(String path) Called when a new node has been created.
void	nodeDeleted(String path) Called when a node has been deleted
void	stop()

Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

getWatcher, nodeChildrenChanged, nodeDataChanged

Methods inherited from class java.lang.Object

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

Method Detail

nodeCreated

public void nodeCreated(String path)

Description copied from class: ZooKeeperListener

Called when a new node has been created.

Overrides:

nodeCreated in class ZooKeeperListener

Parameters:

path - full path of the new node

nodeDeleted

public void nodeDeleted(String path)

Description copied from class: ZooKeeperListener

Called when a node has been deleted

Overrides:

nodeDeleted in class ZooKeeperListener

Parameters:

path - full path of the deleted node

isActiveMaster

public boolean isActiveMaster()

Returns:

True if cluster has an active master.

stop

public void stop()