hadoop/hadoop-hdfs-project/hadoop-hdfs/CHANGES_HDFS-2832.txt

  BREAKDOWN OF HDFS-2832 ENABLE SUPPORT FOR HETEROGENEOUS STORAGES IN HDFS

IMPROVEMENTS:

    HDFS-4985. Add storage type to the protocol and expose it in block report
    and block locations. (Arpit Agarwal)
    
    HDFS-5115. Make StorageID a UUID. (Arpit Agarwal)

    HDFS-5000. DataNode configuration should allow specifying storage type.
    (Arpit Agarwal)

    HDFS-4987. Namenode changes to track multiple storages per datanode.
    (szetszwo)

    HDFS-5154. Fix TestBlockManager and TestDatanodeDescriptor after HDFS-4987.
    (Junping Du via szetszwo)

    HDFS-5009. Include storage information in the LocatedBlock.  (szetszwo)

    HDFS-5134. Move blockContentsStale, heartbeatedSinceFailover and
    firstBlockReport from DatanodeDescriptor to DatanodeStorageInfo; and
    fix a synchronization problem in DatanodeStorageInfo.  (szetszwo)

    HDFS-5157. Add StorageType to FsVolume.  (Junping Du via szetszwo)

    HDFS-4990. Change BlockPlacementPolicy to choose storages instead of
    datanodes.  (szetszwo)

    HDFS-5232. Protocol changes to transmit StorageUuid. (Arpit Agarwal)

    HDFS-5233. Use Datanode UUID to identify Datanodes. (Arpit Agarwal)

    HDFS-5222. Move block schedule information from DatanodeDescriptor to
    DatanodeStorageInfo.  (szetszwo)

    HDFS-4988. Datanode must support all the volumes as individual storages.
    (Arpit Agarwal)