hadoop/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-4949.txt

Hadoop HDFS Change Log for HDFS-4949

HDFS-4949 (Unreleased)

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS
    HDFS-5049.  Add JNI mlock support.  (Andrew Wang via Colin Patrick McCabe)

    HDFS-5051.  Propagate cache status information from the DataNode to the
    NameNode  (Andrew Wang via Colin Patrick McCabe)

    HDFS-5052.  Add cacheRequest/uncacheRequest support to NameNode.
    (contributed by Colin Patrick McCabe)

    HDFS-5050.  Add DataNode support for mlock and munlock
    (Andrew Wang via Colin Patrick McCabe)

    HDFS-5141. Add cache status information to datanode heartbeat.
    (Contributed by Andrew Wang)

    HDFS-5121. Add RPCs for creating and manipulating cache pools.
    (Contributed by Colin Patrick McCabe)

    HDFS-5163. Miscellaneous cache pool RPC fixes.  (Contributed by Colin
    Patrick McCabe)

    HDFS-5120. Add command-line support for manipulating cache pools.
    (Contributed by Colin Patrick McCabe)

    HDFS-5158. Add command-line support for manipulating cache directives.
    (Contributed by Colin Patrick McCabe)

    HDFS-5053. NameNode should invoke DataNode APIs to coordinate caching.
    (Andrew Wang)

    HDFS-5197. Document dfs.cachereport.intervalMsec in hdfs-default.xml.
    (cnauroth)

    HDFS-5213. Separate PathBasedCacheEntry and PathBasedCacheDirectiveWithId.
    (Contributed by Colin Patrick McCabe)

    HDFS-5236. Change PathBasedCacheDirective APIs to be a single value
    rather than batch. (Contributed by Andrew Wang)

    HDFS-5191. Revisit zero-copy API in FSDataInputStream to make it more
    intuitive.  (Contributed by Colin Patrick McCabe)

    HDFS-5119. Persist CacheManager state in the edit log.
    (Contributed by Andrew Wang)

    HDFS-5190. Move cache pool related CLI commands to CacheAdmin.
    (Contributed by Andrew Wang)

    HDFS-5304. Expose if a block replica is cached in getFileBlockLocations.
    (Contributed by Andrew Wang)

    HDFS-5224. Refactor PathBasedCache* methods to use a Path rather than a
    String. (cnauroth)

    HDFS-5358. Add replication field to PathBasedCacheDirective.
    (Contributed by Colin Patrick McCabe)

    HDFS-5359. Allow LightWeightGSet#Iterator to remove elements.
    (Contributed by Colin Patrick McCabe)

    HDFS-5096. Automatically cache new data added to a cached path.
    (Contributed by Colin Patrick McCabe)

    HDFS-5378. In CacheReport, don't send genstamp and length on the wire
    (Contributed by Colin Patrick McCabe)

  OPTIMIZATIONS
    HDFS-5349. DNA_CACHE and DNA_UNCACHE should be by blockId only. (cmccabe)

  BUG FIXES
    HDFS-5169. hdfs.c: translateZCRException: null pointer deref when
    translating some exceptions.  (Contributed by Colin Patrick McCabe)

    HDFS-5198. NameNodeRpcServer must not send back DNA_FINALIZE in reply to a
    cache report.  (Contributed by Colin Patrick McCabe)

    HDFS-5195. Prevent passing null pointer to mlock and munlock. (cnauroth)

    HDFS-5201. NativeIO: consolidate getrlimit into NativeIO#getMemlockLimit
    (Contributed by Colin Patrick McCabe)

    HDFS-5210. Fix some failing unit tests on HDFS-4949 branch.
    (Contributed by Andrew Wang)

    HDFS-5266. ElasticByteBufferPool#Key does not implement equals. (cnauroth)

    HDFS-5309. Fix failing caching unit tests. (Andrew Wang)

    HDFS-5314. Do not expose CachePool type in AddCachePoolOp (Colin Patrick
    McCabe)

    HDFS-5348. Fix error message when dfs.datanode.max.locked.memory is
    improperly configured. (Colin Patrick McCabe)

    HDFS-5373. hdfs cacheadmin -addDirective short usage does not mention
    -replication parameter. (cnauroth)

    HDFS-5383. fix broken caching unit tests. (Andrew Wang)

    HDFS-5388. Loading fsimage fails to find cache pools during namenode
    startup.  (Chris Nauroth via Colin Patrick McCabe)

    HDFS-5203. Concurrent clients that add a cache directive on the same path
    may prematurely uncache from each other.  (Chris Nauroth via Colin Patrick
    McCabe)

    HDFS-5385. Caching RPCs are AtMostOnce, but do not persist client ID and
    call ID to edit log.  (Chris Nauroth via Colin Patrick McCabe)

    HDFS-5404. Resolve regressions in Windows compatibility on HDFS-4949
    branch. (Chris Nauroth via Andrew Wang)

    HDFS-5405. Fix possible RetryCache hang for caching RPC handlers in
    FSNamesystem. (wang)