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 Details

    • getNNRole

      String getNNRole()
      Gets the NameNode role.
      Returns:
      the NameNode role.

    • getState

      String getState()
      Gets the NameNode state.
      Returns:
      the NameNode state.

    • getHostAndPort

      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

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

    • getSlowDisksReport

      String getSlowDisksReport()
      Gets the topN slow disks in the cluster, if the feature is enabled.
      Returns:
      JSON string of list of diskIDs and latencies