DatanodeStatistics (Apache Hadoop HDFS 2.7.4.0 API)

```
public interface DatanodeStatistics
```
Datanode statistics

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`long`	`getBlockPoolUsed()`
`long`	`getCacheCapacity()`
`long`	`getCacheUsed()`
`long`	`getCapacityRemaining()`
`float`	`getCapacityRemainingPercent()`
`long`	`getCapacityTotal()`
`long`	`getCapacityUsed()`
`long`	`getCapacityUsedNonDFS()`
`float`	`getCapacityUsedPercent()`
`int`	`getExpiredHeartbeats()`
`int`	`getInServiceXceiverCount()`
`int`	`getNumDatanodesInService()`
`float`	`getPercentBlockPoolUsed()`
`long[]`	`getStats()` The same as `ClientProtocol.getStats()`.
`int`	`getXceiverCount()`

- Method Detail
  - getCapacityTotal
```
long getCapacityTotal()
```
    Returns:
    
    the total capacity
  - getCapacityUsed
```
long getCapacityUsed()
```
    Returns:
    
    the used capacity
  - getCapacityUsedPercent
```
float getCapacityUsedPercent()
```
    Returns:
    
    the percentage of the used capacity over the total capacity.
  - getCapacityRemaining
```
long getCapacityRemaining()
```
    Returns:
    
    the remaining capacity
  - getCapacityRemainingPercent
```
float getCapacityRemainingPercent()
```
    Returns:
    
    the percentage of the remaining capacity over the total capacity.
  - getBlockPoolUsed
```
long getBlockPoolUsed()
```
    Returns:
    
    the block pool used.
  - getPercentBlockPoolUsed
```
float getPercentBlockPoolUsed()
```
    Returns:
    
    the percentage of the block pool used space over the total capacity.
  - getCacheCapacity
```
long getCacheCapacity()
```
    Returns:
    
    the total cache capacity of all DataNodes
  - getCacheUsed
```
long getCacheUsed()
```
    Returns:
    
    the total cache used by all DataNodes
  - getXceiverCount
```
int getXceiverCount()
```
    Returns:
    
    the xceiver count
  - getInServiceXceiverCount
```
int getInServiceXceiverCount()
```
    Returns:
    
    average xceiver count for non-decommission(ing|ed) nodes
  - getNumDatanodesInService
```
int getNumDatanodesInService()
```
    Returns:
    
    number of non-decommission(ing|ed) nodes
  - getCapacityUsedNonDFS
```
long getCapacityUsedNonDFS()
```
    Returns:
    
    the total used space by data nodes for non-DFS purposes such as storing temporary files on the local file system
  - getStats
```
long[] getStats()
```
    The same as ClientProtocol.getStats(). The block related entries are set to -1.
  - getExpiredHeartbeats
```
int getExpiredHeartbeats()
```
    Returns:
    
    the expired heartbeats

Interface DatanodeStatistics

Method Summary

Method Detail

getCapacityTotal

getCapacityUsed

getCapacityUsedPercent

getCapacityRemaining

getCapacityRemainingPercent

getBlockPoolUsed

getPercentBlockPoolUsed

getCacheCapacity

getCacheUsed

getXceiverCount

getInServiceXceiverCount

getNumDatanodesInService

getCapacityUsedNonDFS

getStats

getExpiredHeartbeats