FSNamesystemMBean (Hadoop 1.2.2-SNAPSHOT API)

所有已知实现类:

FSNamesystem
```
public interface FSNamesystemMBean
```
This Interface defines the methods to get the status of a the FSNamesystem of a name node. It is also used for publishing via JMX (hence we follow the JMX naming convention.) Note we have not used the metrics system to implement this MBean, because the interface for the FSNamesystemMBean is stable and should be published as an interface.
Name Node runtime activity statistics is report in another MBean via the metrics system.

另请参阅:
NameNodeInstrumentation

方法概要

方法
限定符和类型	方法和说明
`long`	`getBlocksTotal()` Number of allocated blocks in the system
`long`	`getCapacityRemaining()` Free (unused) storage capacity
`long`	`getCapacityTotal()` Total storage capacity
`long`	`getCapacityUsed()` Used storage capacity
`long`	`getFilesTotal()` Total number of files and directories
`String`	`getFSState()` The state of the file system: Safemode or Operational
`long`	`getPendingReplicationBlocks()` Blocks pending to be replicated
`long`	`getScheduledReplicationBlocks()` Blocks scheduled for replication
`int`	`getTotalLoad()` Total Load on the FSNamesystem
`long`	`getUnderReplicatedBlocks()` Blocks under replicated
`int`	`numDeadDataNodes()` Number of dead data nodes
`int`	`numLiveDataNodes()` Number of Live data nodes

- 方法详细资料
  - getFSState
```
String getFSState()
```
    The state of the file system: Safemode or Operational
    
    返回:
    the state
  - getBlocksTotal
```
long getBlocksTotal()
```
    Number of allocated blocks in the system
    
    返回:
    - number of allocated blocks
  - getCapacityTotal
```
long getCapacityTotal()
```
    Total storage capacity
    
    返回:
    - total capacity in bytes
  - getCapacityRemaining
```
long getCapacityRemaining()
```
    Free (unused) storage capacity
    
    返回:
    - free capacity in bytes
  - getCapacityUsed
```
long getCapacityUsed()
```
    Used storage capacity
    
    返回:
    - used capacity in bytes
  - getFilesTotal
```
long getFilesTotal()
```
    Total number of files and directories
    
    返回:
    - num of files and directories
  - getPendingReplicationBlocks
```
long getPendingReplicationBlocks()
```
    Blocks pending to be replicated
    
    返回:
    - num of blocks to be replicated
  - getUnderReplicatedBlocks
```
long getUnderReplicatedBlocks()
```
    Blocks under replicated
    
    返回:
    - num of blocks under replicated
  - getScheduledReplicationBlocks
```
long getScheduledReplicationBlocks()
```
    Blocks scheduled for replication
    
    返回:
    - num of blocks scheduled for replication
  - getTotalLoad
```
int getTotalLoad()
```
    Total Load on the FSNamesystem
    
    返回:
    - total load of FSNamesystem
  - numLiveDataNodes
```
int numLiveDataNodes()
```
    Number of Live data nodes
    
    返回:
    number of live data nodes
  - numDeadDataNodes
```
int numDeadDataNodes()
```
    Number of dead data nodes
    
    返回:
    number of dead data nodes

接口 FSNamesystemMBean

方法概要

方法详细资料

getFSState

getBlocksTotal

getCapacityTotal

getCapacityRemaining

getCapacityUsed

getFilesTotal

getPendingReplicationBlocks

getUnderReplicatedBlocks

getScheduledReplicationBlocks

getTotalLoad

numLiveDataNodes

numDeadDataNodes