ActiveMasterManager (Apache HBase 1.7.2 API)

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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. 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.ZooKeeperListener
  watcher

Method Summary

Methods
Modifier and Type	Method and Description
`ServerName`	`getActiveMasterServerName()`
`List<ServerName>`	`getBackupMasters()`
`void`	`nodeChildrenChanged(String path)` Called when an existing node has a child node added or removed.
`void`	`nodeCreated(String path)` Called when a new node has been created.
`void`	`nodeDeleted(String path)` Called when a node has been deleted
`void`	`setInfoPort(int infoPort)`
`void`	`stop()`

Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener
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)
```
    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
  - nodeChildrenChanged
```
public void nodeChildrenChanged(String path)
```
    Description copied from class: ZooKeeperListener
    
    Called when an existing node has a child node added or removed.
    
    Overrides:
    
    nodeChildrenChanged in class ZooKeeperListener
    
    Parameters:
    path - full path of the node whose children have changed
  - nodeDeleted
```
public void nodeDeleted(String path)
```
    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
  - getActiveMasterServerName
```
public ServerName getActiveMasterServerName()
```
    Returns:
    the currently active master as seen by us or null if one does not exist.
  - stop
```
public void stop()
```
  - getBackupMasters
```
public List<ServerName> getBackupMasters()
```
    Returns:
    list of registered backup masters.

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