org.apache.hadoop.hbase.master

Class ActiveMasterManager

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZKListener

org.apache.hadoop.hbase.master.ActiveMasterManager

@InterfaceAudience.Private
public class ActiveMasterManager
extends ZKListener

Handles everything on master-side related to master election. Keeps track of currently active master and registered backup masters.

Listens and responds to ZooKeeper notifications on the master znodes, 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.ZKListener

watcher

Method Summary

Modifier and Type	Method and Description
int	getActiveMasterInfoPort()
Optional<ServerName>	getActiveMasterServerName()
int	getBackupMasterInfoPort(ServerName sn)
List<ServerName>	getBackupMasters() Returns list of registered backup masters.
void	nodeChildrenChanged(String path)
void	nodeCreated(String path)
void	nodeDeleted(String path)
void	setInfoPort(int infoPort)
void	stop()

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

getWatcher, nodeDataChanged

Methods inherited from class java.lang.Object

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

Method Detail

setInfoPort

public void setInfoPort(int infoPort)

nodeCreated

public void nodeCreated(String path)

Overrides:

nodeCreated in class ZKListener

nodeChildrenChanged

public void nodeChildrenChanged(String path)

Overrides:

nodeChildrenChanged in class ZKListener

nodeDeleted

public void nodeDeleted(String path)

Overrides:

nodeDeleted in class ZKListener

getActiveMasterServerName

public Optional<ServerName> getActiveMasterServerName()

getActiveMasterInfoPort

public int getActiveMasterInfoPort()

getBackupMasterInfoPort

public int getBackupMasterInfoPort(ServerName sn)

stop

public void stop()

getBackupMasters

public List<ServerName> getBackupMasters()

Returns list of registered backup masters.