ClusterStatusTracker (Apache HBase 1.2.12 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
Modifier and Type Field and Description

private static org.apache.commons.logging.Log LOG
- 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.
`(package private) static byte[]`	`toByteArray()`

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

- Field Detail
  - LOG
```
private static final org.apache.commons.logging.Log LOG
```
- 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
  - toByteArray
```
static byte[] toByteArray()
```
    Returns:
    Content of the clusterup znode as a serialized pb with the pb magic as prefix.

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