ZKNamespaceManager (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.zookeeper.ZooKeeperListener
- - org.apache.hadoop.hbase.ZKNamespaceManager

```
@InterfaceAudience.Private
public class ZKNamespaceManager
extends ZooKeeperListener
```
Class servers two purposes: 1. Broadcast NamespaceDescriptor information via ZK (Done by the Master) 2. Consume broadcasted NamespaceDescriptor changes (Done by the RegionServers)

Field Summary

Fields
Modifier and Type Field and Description

private NavigableMap<String,NamespaceDescriptor> cache

private static org.apache.commons.logging.Log LOG

private String nsZNode
- Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener
  watcher

Fields
Modifier and Type	Field and Description
`private NavigableMap<String,NamespaceDescriptor>`	`cache`
`private static org.apache.commons.logging.Log`	`LOG`
`private String`	`nsZNode`

Constructor Summary

Constructors
Constructor and Description

ZKNamespaceManager(ZooKeeperWatcher zkw)

Constructors
Constructor and Description
`ZKNamespaceManager(ZooKeeperWatcher zkw)`

Method Summary

Methods
Modifier and Type	Method and Description
`private void`	`deleteNamespace(String name)`
`NamespaceDescriptor`	`get(String name)`
`NavigableSet<NamespaceDescriptor>`	`list()`
`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`	`nodeDataChanged(String path)` Called when an existing node has changed data.
`void`	`nodeDeleted(String path)` Called when a node has been deleted
`private void`	`refreshNodes(List<ZKUtil.NodeAndData> nodes)`
`void`	`remove(String name)`
`void`	`start()`
`void`	`update(NamespaceDescriptor ns)`
`private void`	`writeNamespace(NamespaceDescriptor ns)`

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

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.apache.commons.logging.Log LOG
```
  - nsZNode
```
private final String nsZNode
```
  - cache
```
private volatile NavigableMap<String,NamespaceDescriptor> cache
```
- Constructor Detail
  - ZKNamespaceManager
```
public ZKNamespaceManager(ZooKeeperWatcher zkw)
                   throws IOException
```
    Throws:
    
    IOException
- Method Detail
  - start
```
public void start()
           throws IOException
```
    Throws:
    
    IOException
  - get
```
public NamespaceDescriptor get(String name)
```
  - update
```
public void update(NamespaceDescriptor ns)
            throws IOException
```
    Throws:
    
    IOException
  - remove
```
public void remove(String name)
            throws IOException
```
    Throws:
    
    IOException
  - list
```
public NavigableSet<NamespaceDescriptor> list()
                                       throws IOException
```
    Throws:
    
    IOException
  - 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
  - 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
  - nodeDataChanged
```
public void nodeDataChanged(String path)
```
    Description copied from class: ZooKeeperListener
    
    Called when an existing node has changed data.
    
    Overrides:
    
    nodeDataChanged in class ZooKeeperListener
    
    Parameters:
    path - full path of the updated 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
  - deleteNamespace
```
private void deleteNamespace(String name)
                      throws IOException
```
    Throws:
    
    IOException
  - writeNamespace
```
private void writeNamespace(NamespaceDescriptor ns)
                     throws IOException
```
    Throws:
    
    IOException
  - refreshNodes
```
private void refreshNodes(List<ZKUtil.NodeAndData> nodes)
                   throws IOException
```
    Throws:
    
    IOException

Class ZKNamespaceManager

Field Summary

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

Constructor Summary

Method Summary

Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener

Methods inherited from class java.lang.Object

Field Detail

LOG

nsZNode

cache

Constructor Detail

ZKNamespaceManager

Method Detail

start

get

update

remove

list

nodeCreated

nodeDeleted

nodeDataChanged

nodeChildrenChanged

deleteNamespace

writeNamespace

refreshNodes