Package org.apache.hadoop.hdfs.server.namenode

Interface NameNodeStatusMXBean

All Known Implementing Classes:

BackupNode, NameNode

@Private
@Stable
public interface NameNodeStatusMXBean

This is the JMX management interface for NameNode status information. End users shouldn't be implementing these interfaces, and instead access this information through the JMX APIs. *

Method Summary

Modifier and Type	Method	Description
long	getBytesWithFutureGenerationStamps()	Gets number of bytes in blocks with future generation stamps.
java.lang.String	getHostAndPort()	Gets the host and port colon separated.
long	getLastHATransitionTime()	Gets the most recent HA transition time in milliseconds from the epoch.
java.lang.String	getNNRole()	Gets the NameNode role.
java.lang.String	getSlowDisksReport()	Gets the topN slow disks in the cluster, if the feature is enabled.
java.lang.String	getSlowPeersReport()	Retrieves information about slow DataNodes, if the feature is enabled.
java.lang.String	getState()	Gets the NameNode state.
boolean	isSecurityEnabled()	Gets if security is enabled.

Method Detail

getNNRole

java.lang.String getNNRole()

Gets the NameNode role.

Returns:

the NameNode role.

getState

java.lang.String getState()

Gets the NameNode state.

Returns:

the NameNode state.

getHostAndPort

java.lang.String getHostAndPort()

Gets the host and port colon separated.

Returns:

host and port colon separated.

isSecurityEnabled

boolean isSecurityEnabled()

Gets if security is enabled.

Returns:

true, if security is enabled.

getLastHATransitionTime

long getLastHATransitionTime()

Gets the most recent HA transition time in milliseconds from the epoch.

Returns:

the most recent HA transition time in milliseconds from the epoch.

getBytesWithFutureGenerationStamps

long getBytesWithFutureGenerationStamps()

Gets number of bytes in blocks with future generation stamps.

Returns:

number of bytes that can be deleted if exited from safe mode.

getSlowPeersReport

java.lang.String getSlowPeersReport()

Retrieves information about slow DataNodes, if the feature is enabled. The report is in a JSON format.

getSlowDisksReport

java.lang.String getSlowDisksReport()

Gets the topN slow disks in the cluster, if the feature is enabled.

Returns:

JSON string of list of diskIDs and latencies