Package org.apache.hadoop.hdfs.server.datanode.metrics

Interface FSDatasetMBean

All Superinterfaces:
org.apache.hadoop.metrics2.MetricsSource
All Known Subinterfaces:
FsDatasetSpi<V>
@Private public interface FSDatasetMBean extends org.apache.hadoop.metrics2.MetricsSource
This Interface defines the methods to get the status of a the FSDataset of a data node. It is also used for publishing via JMX (hence we follow the JMX naming convention.) * Note we have not used the MetricsDynamicMBeanBase to implement this because the interface for the FSDatasetMBean is stable and should be published as an interface.

Data Node runtime statistic info is report in another MBean

See Also:

  • Method Details

    • getBlockPoolUsed

      long getBlockPoolUsed(String bpid) throws IOException
      Returns the total space (in bytes) used by a block pool
      Returns:
      the total space used by a block pool
      Throws:
      IOException

    • getDfsUsed

      long getDfsUsed() throws IOException
      Returns the total space (in bytes) used by dfs datanode
      Returns:
      the total space used by dfs datanode
      Throws:
      IOException

    • getCapacity

      long getCapacity() throws IOException
      Returns total capacity (in bytes) of storage (used and unused)
      Returns:
      total capacity of storage (used and unused)
      Throws:
      IOException

    • getRemaining

      long getRemaining() throws IOException
      Returns the amount of free storage space (in bytes)
      Returns:
      The amount of free storage space
      Throws:
      IOException

    • getStorageInfo

      String getStorageInfo()
      Returns the storage id of the underlying storage

    • getNumFailedVolumes

      int getNumFailedVolumes()
      Returns the number of failed volumes in the datanode.
      Returns:
      The number of failed volumes in the datanode.

    • getFailedStorageLocations

      String[] getFailedStorageLocations()
      Returns each storage location that has failed, sorted.
      Returns:
      each storage location that has failed, sorted

    • getLastVolumeFailureDate

      long getLastVolumeFailureDate()
      Returns the date/time of the last volume failure in milliseconds since epoch.
      Returns:
      date/time of last volume failure in milliseconds since epoch

    • getEstimatedCapacityLostTotal

      long getEstimatedCapacityLostTotal()
      Returns an estimate of total capacity lost due to volume failures in bytes.
      Returns:
      estimate of total capacity lost in bytes

    • getCacheUsed

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

    • getCacheCapacity

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

    • getNumBlocksCached

      long getNumBlocksCached()
      Returns the number of blocks cached.

    • getNumBlocksFailedToCache

      long getNumBlocksFailedToCache()
      Returns the number of blocks that the datanode was unable to cache

    • getNumBlocksFailedToUncache

      long getNumBlocksFailedToUncache()
      Returns the number of blocks that the datanode was unable to uncache

    • getLastDirScannerFinishTime

      long getLastDirScannerFinishTime()
      Returns the last time in milliseconds when the directory scanner successfully ran.

    • getPendingAsyncDeletions

      long getPendingAsyncDeletions()
      Returns the count of pending and running asynchronous disk operations.