Package org.apache.hadoop.hdfs.server.blockmanagement

Interface FSClusterStats

@Private
public interface FSClusterStats

This interface is used for retrieving the load related statistics of the cluster.

Method Summary

Modifier and Type	Method	Description
double	getInServiceXceiverAverage()	An indication of the average load of non-decommission(ing|ed) nodes eligible for block placement.
double	getInServiceXceiverAverageForVolume()	An indication of the average load of volumes at non-decommission(ing|ed) nodes eligible for block placement.
int	getNumDatanodesInService()	Indicates number of datanodes that are in service.
java.util.Map<org.apache.hadoop.fs.StorageType,StorageTypeStats>	getStorageTypeStats()	Indicates the storage statistics per storage type.
int	getTotalLoad()	an indication of the total load of the cluster.
boolean	isAvoidingStaleDataNodesForWrite()	Indicate whether or not the cluster is now avoiding to use stale DataNodes for writing.

Method Detail

getTotalLoad

int getTotalLoad()

an indication of the total load of the cluster.

Returns:

a count of the total number of block transfers and block writes that are currently occuring on the cluster.

isAvoidingStaleDataNodesForWrite

boolean isAvoidingStaleDataNodesForWrite()

Indicate whether or not the cluster is now avoiding to use stale DataNodes for writing.

Returns:

True if the cluster is currently avoiding using stale DataNodes for writing targets, and false otherwise.

getNumDatanodesInService

int getNumDatanodesInService()

Indicates number of datanodes that are in service.

Returns:

Number of datanodes that are both alive and not decommissioned.

getInServiceXceiverAverage

double getInServiceXceiverAverage()

An indication of the average load of non-decommission(ing|ed) nodes eligible for block placement.

Returns:

average of the in service number of block transfers and block writes that are currently occurring on the cluster.

getInServiceXceiverAverageForVolume

double getInServiceXceiverAverageForVolume()

An indication of the average load of volumes at non-decommission(ing|ed) nodes eligible for block placement.

Returns:

average of in service number of block transfers and block writes that are currently occurring on the volumes of the cluster.

getStorageTypeStats

java.util.Map<org.apache.hadoop.fs.StorageType,StorageTypeStats> getStorageTypeStats()

Indicates the storage statistics per storage type.

Returns:

storage statistics per storage type.