org.apache.hadoop.hbase.zookeeper

Class ZKLeaderManager

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

org.apache.hadoop.hbase.zookeeper.ZKLeaderManager

Deprecated.

Not used

@Deprecated
@InterfaceAudience.Private
public class ZKLeaderManager
extends ZooKeeperListener

Handles coordination of a single "leader" instance among many possible candidates. The first ZKLeaderManager to successfully create the given znode becomes the leader, allowing the instance to continue with whatever processing must be protected. Other ZKLeaderManager instances will wait to be notified of changes to the leader znode. If the current master instance fails, the ephemeral leader znode will be removed, and all waiting instances will be notified, with the race to claim the leader znode beginning all over again.

Field Summary

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

watcher

Constructor Summary

Constructors

Constructor and Description
ZKLeaderManager(ZooKeeperWatcher watcher, String leaderZNode, byte[] identifier, Stoppable candidate) Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	hasLeader() Deprecated.
void	nodeCreated(String path) Deprecated. Called when a new node has been created.
void	nodeDeleted(String path) Deprecated. Called when a node has been deleted
void	start() Deprecated.
void	stepDownAsLeader() Deprecated. Removes the leader znode, if it is currently claimed by this instance.
void	waitToBecomeLeader() Deprecated. Blocks until this instance has claimed the leader ZNode in ZooKeeper

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

Constructor Detail

ZKLeaderManager

public ZKLeaderManager(ZooKeeperWatcher watcher,
               String leaderZNode,
               byte[] identifier,
               Stoppable candidate)

Deprecated.

Method Detail

start

public void start()

Deprecated.

nodeCreated

public void nodeCreated(String path)

Deprecated.

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)

Deprecated.

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

waitToBecomeLeader

public void waitToBecomeLeader()

Deprecated.

Blocks until this instance has claimed the leader ZNode in ZooKeeper

stepDownAsLeader

public void stepDownAsLeader()

Deprecated.

Removes the leader znode, if it is currently claimed by this instance.

hasLeader

public boolean hasLeader()

Deprecated.