ClusterStatusTracker (Apache HBase 1.4.11 API)

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java.lang.Object
- org.apache.hadoop.hbase.zookeeper.ZooKeeperListener
- - org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker
  - - org.apache.hadoop.hbase.zookeeper.ClusterStatusTracker

```
@InterfaceAudience.Private
public class ClusterStatusTracker
extends ZooKeeperNodeTracker
```
Tracker on cluster settings up in zookeeper. This is not related to ClusterStatus. That class is a data structure that holds snapshot of current view on cluster. This class is about tracking cluster attributes up in zookeeper.

Field Summary
- Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker
  abortable, node
- Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener
  watcher

Constructor Summary

Constructors
Constructor and Description

ClusterStatusTracker(ZooKeeperWatcher watcher, Abortable abortable)
Creates a cluster status tracker.

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`isClusterUp()` Checks if cluster is up.
`void`	`setClusterDown()` Sets the cluster as down by deleting the znode.
`void`	`setClusterUp()` Sets the cluster as up.

Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker
blockUntilAvailable, blockUntilAvailable, checkIfBaseNodeAvailable, getData, getNode, nodeCreated, nodeDataChanged, nodeDeleted, start, stop, toString

Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener
getWatcher, nodeChildrenChanged

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ClusterStatusTracker
```
public ClusterStatusTracker(ZooKeeperWatcher watcher,
                    Abortable abortable)
```
    Creates a cluster status tracker.
    After construction, use ZooKeeperNodeTracker.start() to kick off tracking.
    
    Parameters:
    watcher -
    abortable -
- Method Detail
  - isClusterUp
```
public boolean isClusterUp()
```
    Checks if cluster is up.
    
    Returns:
    true if the cluster up ('shutdown' is its name up in zk) znode exists with data, false if not
  - setClusterUp
```
public void setClusterUp()
                  throws org.apache.zookeeper.KeeperException
```
    Sets the cluster as up.
    
    Throws:
    
    org.apache.zookeeper.KeeperException - unexpected zk exception
  - setClusterDown
```
public void setClusterDown()
                    throws org.apache.zookeeper.KeeperException
```
    Sets the cluster as down by deleting the znode.
    
    Throws:
    
    org.apache.zookeeper.KeeperException - unexpected zk exception

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