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

boolean	isActiveMaster()
void	nodeCreated(String path)
void	nodeDeleted(String path)
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)

Overrides:

nodeCreated in class ZooKeeperListener

nodeDeleted

public void nodeDeleted(String path)

Overrides:

nodeDeleted in class ZooKeeperListener

isActiveMaster

public boolean isActiveMaster()

Returns:

True if cluster has an active master.

stop

public void stop()