BREAKDOWN OF HDFS-7285 SUBTASKS AND RELATED JIRAS

    HDFS-7347. Configurable erasure coding policy for individual files and
    directories ( Zhe Zhang via vinayakumarb )

    HDFS-7339. Representing striped block groups in NameNode with hierarchical
    naming protocol ( Zhe Zhang )

    HDFS-7652. Process block reports for erasure coded blocks (Zhe Zhang)

    HDFS-7716. Erasure Coding: extend BlockInfo to handle EC info (Jing Zhao)

    HDFS-7749. Erasure Coding: Add striped block support in INodeFile (Jing Zhao)

    HDFS-7837. Erasure Coding: allocate and persist striped blocks in NameNode
    (Jing Zhao via Zhe Zhang)

    HDFS-7872. Erasure Coding: INodeFile.dumpTreeRecursively() supports to print
    striped blocks (Takuya Fukudome via jing9)

    HDFS-7853. Erasure coding: extend LocatedBlocks to support reading from
    striped files (Jing Zhao)

    HDFS-7826. Erasure Coding: Update INodeFile quota computation for striped
    blocks ( Kai Sasaki via jing9 )

    HDFS-7912. Erasure Coding: track BlockInfo instead of Block in
    UnderReplicatedBlocks and PendingReplicationBlocks (Jing Zhao)

    HDFS-7369. Erasure coding: distribute recovery work for striped blocks to
    DataNode (Zhe Zhang)

    HDFS-7864. Erasure Coding: Update safemode calculation for striped blocks
    (GAO Rui via jing9)

    HDFS-7827. Erasure Coding: support striped blocks in non-protobuf fsimage
    ( Hui Zheng via jing9 )

    HDFS-7616. Add a test for BlockGroup support in FSImage.
    (Takuya Fukudome via szetszwo)

    HDFS-7907. Erasure Coding: track invalid, corrupt, and under-recovery striped
    blocks in NameNode (Jing Zhao)

    HDFS-8005. Erasure Coding: simplify striped block recovery work computation
    and add tests (Jing Zhao)

    HDFS-7617. Add unit tests for editlog transactions for EC 
    (Hui Zheng via Zhe Zhang)

    HDFS-7839. Erasure coding: implement facilities in NameNode to create and
    manage EC zones (Zhe Zhang)

    HDFS-7969. Erasure coding: NameNode support for lease recovery of striped
    block groups. (Zhe Zhang)

    HDFS-7782. Erasure coding: pread from files in striped layout.
    (Zhe Zhang and Jing Zhao via Zhe Zhang)

    HDFS-8023. Erasure Coding: retrieve eraure coding schema for a file from
    NameNode (vinayakumarb)
    
    HDFS-8074. Define a system-wide default EC schema. (Kai Zheng)

    HDFS-8077. Erasure coding: fix bugs in EC zone and symlinks.
    (Jing Zhao and Zhe Zhang via Jing Zhao)

    HDFS-8104. Make hard-coded values consistent with the system default schema first before remove them. (Kai Zheng)

    HDFS-7889. Subclass DFSOutputStream to support writing striping layout files. (Li Bo via Kai Zheng)

    HDFS-8090. Erasure Coding: Add RPC to client-namenode to list all
    ECSchemas loaded in Namenode. (vinayakumarb)

    HDFS-8122. Erasure Coding: Support specifying ECSchema during creation of ECZone.
    (Vinayakumar B via Zhe Zhang)

    HDFS-8114. Erasure coding: Add auditlog FSNamesystem#createErasureCodingZone if this
    operation fails. (Rakesh R via Zhe Zhang)

    HDFS-8123. Erasure Coding: Better to move EC related proto messages to a
    separate erasurecoding proto file (Rakesh R via vinayakumarb)

    HDFS-7349. Support DFS command for the EC encoding (vinayakumarb)

    HDFS-8120. Erasure coding: created util class to analyze striped block groups.
    (Contributed by Zhe Zhang and Li Bo via Jing Zhao)

    HDFS-7994. Detect if resevered EC Block ID is already used during namenode
    startup. (Hui Zheng via szetszwo)

    HDFS-8167. BlockManager.addBlockCollectionWithCheck should check if the block is a striped block. (Hui Zheng via zhz).

    HDFS-8166. DFSStripedOutputStream should not create empty blocks. (Jing Zhao)

    HDFS-7937. Erasure Coding: INodeFile quota computation unit tests.
    (Kai Sasaki via Jing Zhao)

    HDFS-8145. Fix the editlog corruption exposed by failed TestAddStripedBlocks.
    (Jing Zhao)

    HDFS-8146. Protobuf changes for BlockECRecoveryCommand and its fields for
    making it ready for transfer to DN (Uma Maheswara Rao G via vinayakumarb)

    HDFS-8181. createErasureCodingZone sets retryCache state as false always
    (Uma Maheswara Rao G via vinayakumarb)

    HDFS-8190. StripedBlockUtil.getInternalBlockLength may have overflow error.
    (szetszwo)

    HDFS-8216. TestDFSStripedOutputStream should use BlockReaderTestUtil to 
    create BlockReader. (szetszwo via Zhe Zhang)