@Deprecated @InterfaceAudience.Private public class ZKLeaderManager extends ZooKeeperListener
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.| Modifier and Type | Field and Description |
|---|---|
private Stoppable |
candidate
Deprecated.
|
private AtomicBoolean |
leaderExists
Deprecated.
|
private String |
leaderZNode
Deprecated.
|
private static org.apache.commons.logging.Log |
LOG
Deprecated.
|
private byte[] |
nodeId
Deprecated.
|
watcher| Constructor and Description |
|---|
ZKLeaderManager(ZooKeeperWatcher watcher,
String leaderZNode,
byte[] identifier,
Stoppable candidate)
Deprecated.
|
| 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
|
getWatcher, nodeChildrenChanged, nodeDataChangedprivate static final org.apache.commons.logging.Log LOG
private final AtomicBoolean leaderExists
private String leaderZNode
private byte[] nodeId
private Stoppable candidate
public ZKLeaderManager(ZooKeeperWatcher watcher, String leaderZNode, byte[] identifier, Stoppable candidate)
public void start()
public void nodeCreated(String path)
ZooKeeperListenernodeCreated in class ZooKeeperListenerpath - full path of the new nodepublic void nodeDeleted(String path)
ZooKeeperListenernodeDeleted in class ZooKeeperListenerpath - full path of the deleted nodeprivate void handleLeaderChange()
public void waitToBecomeLeader()
public void stepDownAsLeader()
public boolean hasLeader()
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