org.apache.hadoop.hbase.zookeeper

Class ZKLeaderManager

java.lang.Object

org.apache.hadoop.hbase.zookeeper.ZKListener

org.apache.hadoop.hbase.zookeeper.ZKLeaderManager

Deprecated.

Not used

@Deprecated
 @InterfaceAudience.Private
public class ZKLeaderManager
extends ZKListener

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

Modifier and Type	Field and Description
private Stoppable	candidate Deprecated.
private AtomicBoolean	leaderExists Deprecated.
private String	leaderZNode Deprecated.
private Object	lock Deprecated.
private static org.slf4j.Logger	LOG Deprecated.
private byte[]	nodeId Deprecated.

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

watcher

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
private void	handleLeaderChange() Deprecated.
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.ZKListener

getWatcher, nodeChildrenChanged, nodeDataChanged

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final org.slf4j.Logger LOG

Deprecated.

lock

private final Object lock

Deprecated.

leaderExists

private final AtomicBoolean leaderExists

Deprecated.

leaderZNode

private final String leaderZNode

Deprecated.

nodeId

private final byte[] nodeId

Deprecated.

candidate

private final Stoppable candidate

Deprecated.

Constructor Detail

ZKLeaderManager

public ZKLeaderManager(ZKWatcher 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: ZKListener

Called when a new node has been created.

Overrides:

nodeCreated in class ZKListener

Parameters:

path - full path of the new node

nodeDeleted

public void nodeDeleted(String path)

Deprecated.

Description copied from class: ZKListener

Called when a node has been deleted

Overrides:

nodeDeleted in class ZKListener

Parameters:

path - full path of the deleted node

handleLeaderChange

private void handleLeaderChange()

Deprecated.

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.