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

Interface NameNodeMXBean

All Known Implementing Classes:
FSNamesystem
@Private @Stable public interface NameNodeMXBean
This is the JMX management interface for namenode information. End users shouldn't be implementing these interfaces, and instead access this information through the JMX APIs.

  • Method Details

    • getVersion

      String getVersion()
      Gets the version of Hadoop.
      Returns:
      the version.

    • getSoftwareVersion

      String getSoftwareVersion()
      Get the version of software running on the Namenode.
      Returns:
      a string representing the version.

    • getUsed

      long getUsed()
      Gets the used space by data nodes.
      Returns:
      the used space by data nodes.

    • getFree

      long getFree()
      Gets total non-used raw bytes.
      Returns:
      total non-used raw bytes.

    • getTotal

      long getTotal()
      Gets total raw bytes including non-dfs used space.
      Returns:
      the total raw bytes including non-dfs used space.

    • getProvidedCapacity

      long getProvidedCapacity()
      Gets capacity of the provided storage mounted, in bytes.
      Returns:
      the total raw bytes present in the provided storage.

    • getSafemode

      String getSafemode()
      Gets the safemode status.
      Returns:
      the safemode status.

    • isUpgradeFinalized

      boolean isUpgradeFinalized()
      Checks if upgrade is finalized.
      Returns:
      true, if upgrade is finalized.

    • getRollingUpgradeStatus

      org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo.Bean getRollingUpgradeStatus()
      Gets the RollingUpgrade information.
      Returns:
      Rolling upgrade information if an upgrade is in progress. Else (e.g. if there is no upgrade or the upgrade is finalized), returns null.

    • getNonDfsUsedSpace

      long getNonDfsUsedSpace()
      Gets total used space by data nodes for non DFS purposes such as storing temporary files on the local file system.
      Returns:
      the non dfs space of the cluster.

    • getPercentUsed

      float getPercentUsed()
      Gets the total used space by data nodes as percentage of total capacity.
      Returns:
      the percentage of used space on the cluster.

    • getPercentRemaining

      float getPercentRemaining()
      Gets the total remaining space by data nodes as percentage of total capacity.
      Returns:
      the percentage of the remaining space on the cluster.

    • getCacheUsed

      long getCacheUsed()
      Gets the amount of cache used by the datanode (in bytes).
      Returns:
      the amount of cache used by the datanode (in bytes).

    • getCacheCapacity

      long getCacheCapacity()
      Gets the total cache capacity of the datanode (in bytes).
      Returns:
      the total cache capacity of the datanode (in bytes).

    • getBlockPoolUsedSpace

      long getBlockPoolUsedSpace()
      Get the total space used by the block pools of this namenode.
      Returns:
      the total space used by the block pools of this namenode.

    • getPercentBlockPoolUsed

      float getPercentBlockPoolUsed()
      Get the total space used by the block pool as percentage of total capacity.
      Returns:
      the total space used by the block pool as percentage of total capacity.

    • getTotalBlocks

      long getTotalBlocks()
      Gets the total numbers of blocks on the cluster.
      Returns:
      the total number of blocks of the cluster.

    • getNumberOfMissingBlocks

      long getNumberOfMissingBlocks()
      Gets the total number of missing blocks on the cluster.
      Returns:
      the total number of missing blocks on the cluster.

    • getNumberOfMissingBlocksWithReplicationFactorOne

      long getNumberOfMissingBlocksWithReplicationFactorOne()
      Gets the total number of missing blocks on the cluster with replication factor 1.
      Returns:
      the total number of missing blocks on the cluster with replication factor 1.

    • getNumberOfBadlyDistributedBlocks

      long getNumberOfBadlyDistributedBlocks()
      Gets the total number of badly distributed blocks.
      Returns:
      the total number of badly distrubted blocks.

    • getHighestPriorityLowRedundancyReplicatedBlocks

      long getHighestPriorityLowRedundancyReplicatedBlocks()
      Gets the total number of replicated low redundancy blocks on the cluster with the highest risk of loss.
      Returns:
      the total number of low redundancy blocks on the cluster with the highest risk of loss.

    • getHighestPriorityLowRedundancyECBlocks

      long getHighestPriorityLowRedundancyECBlocks()
      Gets the total number of erasure coded low redundancy blocks on the cluster with the highest risk of loss.
      Returns:
      the total number of low redundancy blocks on the cluster with the highest risk of loss.

    • getNumberOfSnapshottableDirs

      long getNumberOfSnapshottableDirs()
      Gets the total number of snapshottable dirs in the system.
      Returns:
      the total number of snapshottable dirs in the system.

    • getThreads

      int getThreads()
      Gets the number of threads.
      Returns:
      the number of threads.

    • getLiveNodes

      String getLiveNodes()
      Gets the live node information of the cluster.
      Returns:
      the live node information.

    • getDeadNodes

      String getDeadNodes()
      Gets the dead node information of the cluster.
      Returns:
      the dead node information.

    • getDecomNodes

      String getDecomNodes()
      Gets the decommissioning node information of the cluster.
      Returns:
      the decommissioning node information.

    • getEnteringMaintenanceNodes

      String getEnteringMaintenanceNodes()
      Gets the information on nodes entering maintenance.
      Returns:
      the information on nodes entering maintenance.

    • getClusterId

      String getClusterId()
      Gets the cluster id.
      Returns:
      the cluster id.

    • getBlockPoolId

      String getBlockPoolId()
      Gets the block pool id.
      Returns:
      the block pool id.

    • getNameDirStatuses

      String getNameDirStatuses()
      Get status information about the directories storing image and edits logs of the NN.
      Returns:
      the name dir status information, as a JSON string.

    • getNodeUsage

      String getNodeUsage()
      Get Max, Median, Min and Standard Deviation of DataNodes usage.
      Returns:
      the DataNode usage information, as a JSON string.

    • getNameJournalStatus

      String getNameJournalStatus()
      Get status information about the journals of the NN.
      Returns:
      the name journal status information, as a JSON string.

    • getJournalTransactionInfo

      String getJournalTransactionInfo()
      Get information about the transaction ID, including the last applied transaction ID and the most recent checkpoint's transaction ID.
      Returns:
      information about the transaction ID.

    • getNNStartedTimeInMillis

      long getNNStartedTimeInMillis()
      Gets the NN start time in milliseconds.
      Returns:
      the NN start time in msec.

    • getCompileInfo

      String getCompileInfo()
      Get the compilation information which contains date, user and branch.
      Returns:
      the compilation information, as a JSON string.

    • getCorruptFiles

      String getCorruptFiles()
      Get the list of corrupt files.
      Returns:
      the list of corrupt files, as a JSON string.

    • getCorruptFilesCount

      int getCorruptFilesCount()
      Get the length of the list of corrupt files.
      Returns:
      the length of the list of corrupt files.

    • getDistinctVersionCount

      int getDistinctVersionCount()
      Get the number of distinct versions of live datanodes.
      Returns:
      the number of distinct versions of live datanodes.

    • getDistinctVersions

      Map<String,Integer> getDistinctVersions()
      Get the number of live datanodes for each distinct versions.
      Returns:
      the number of live datanodes for each distinct versions.

    • getNameDirSize

      String getNameDirSize()
      Get namenode directory size.
      Returns:
      namenode directory size.

    • getVerifyECWithTopologyResult

      String getVerifyECWithTopologyResult()
      Verifies whether the cluster setup can support all enabled EC policies.
      Returns:
      the result of the verification.