Fix HDFS and Common CHANGES.txt for branch-2.3 reswizzle

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.3@1562626 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -1,6 +1,6 @@
 Hadoop Change Log
 
-Release 2.4.0 - UNRELEASED
+Release 2.3.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES
 
@@ -11,6 +11,27 @@ Release 2.4.0 - UNRELEASED
 
   IMPROVEMENTS
 
+    HADOOP-10046. Print a log message when SSL is enabled.
+    (David S. Wang via wang)
+
+    HADOOP-10079. log a warning message if group resolution takes too long.
+    (cmccabe)
+
+    HADOOP-9623. Update jets3t dependency to 0.9.0 (Amandeep Khurana via Colin
+    Patrick McCabe)
+
+    HADOOP-10132. RPC#stopProxy() should log the class of proxy when IllegalArgumentException 
+    is encountered (Ted yu via umamahesh)
+
+    HADOOP-10248. Property name should be included in the exception where property value 
+    is null (Akira AJISAKA via umamahesh)
+
+    HADOOP-10086. User document for authentication in secure cluster.
+    (Masatake Iwasaki via Arpit Agarwal)
+
+    HADOOP-10274 Lower the logging level from ERROR to WARN for UGI.doAs method
+    (Takeshi Miao via stack)
+
     HADOOP-9784. Add a builder for HttpServer. (Junping Du via llu)
 
     HADOOP 9871. Fix intermittent findbugs warnings in DefaultMetricsSystem.
@@ -126,6 +147,9 @@ Release 2.4.0 - UNRELEASED
 
   OPTIMIZATIONS
 
+    HADOOP-10142. Avoid groups lookup for unprivileged users such as "dr.who"
+    (vinay via cmccabe)
+
     HADOOP-9748. Reduce blocking on UGI.ensureInitialized (daryn)
 
     HADOOP-10047. Add a direct-buffer based apis for compression. (Gopal V
@@ -142,138 +166,6 @@ Release 2.4.0 - UNRELEASED
     HADOOP-10143 replace WritableFactories's hashmap with ConcurrentHashMap
     (Liang Xie via stack)
 
-  BUG FIXES
-
-    HADOOP-9964. Fix deadlocks in TestHttpServer by synchronize
-    ReflectionUtils.printThreadInfo. (Junping Du via llu)
-
-    HADOOP-9582. Non-existent file to "hadoop fs -conf" doesn't throw error
-    (Ashwin Shankar via jlowe)
-
-    HADOOP-9817. FileSystem#globStatus and FileContext#globStatus need to work
-    with symlinks. (Colin Patrick McCabe via Andrew Wang)
-
-    HADOOP-9875.  TestDoAsEffectiveUser can fail on JDK 7.  (Aaron T. Myers via
-    Colin Patrick McCabe)
-
-    HADOOP-9865.  FileContext#globStatus has a regression with respect to
-    relative path.  (Chuan Lin via Colin Patrick McCabe)
-
-    HADOOP-9909. org.apache.hadoop.fs.Stat should permit other LANG.
-    (Shinichi Yamashita via Andrew Wang)
-
-    HADOOP-9908. Fix NPE when versioninfo properties file is missing (todd)
-
-    HADOOP-9929. Insufficient permissions for a path reported as File Not
-    Found.  (Contributed by Colin Patrick McCabe)
-
-    HADOOP-9791. Add a test case covering long paths for new FileUtil access
-    check methods (ivanmi)
-
-    HADOOP-9981. globStatus should minimize its listStatus and getFileStatus
-    calls.  (Contributed by Colin Patrick McCabe)
-
-    HADOOP-10006. Compilation failure in trunk for
-    o.a.h.fs.swift.util.JSONUtil (Junping Du via stevel)
-
-    HADOOP-9016. HarFsInputStream.skip(long) must never return negative value.
-    (Ivan A. Veselovsky via jeagles)
-
-    HADOOP-10088. copy-nativedistlibs.sh needs to quote snappy lib dir.
-    (Raja Aluri via cnauroth)
-
-    HADOOP-10093. hadoop-env.cmd sets HADOOP_CLIENT_OPTS with a max heap size
-    that is too small. (Shanyu Zhao via cnauroth)
-
-    HADOOP-10094. NPE in GenericOptionsParser#preProcessForWindows().
-    (Enis Soztutar via cnauroth)
-
-    HADOOP-10100. MiniKDC shouldn't use apacheds-all artifact. (rkanter via tucu)
-
-    HADOOP-10107. Server.getNumOpenConnections may throw NPE. (Kihwal Lee via
-    jing9)
-
-    HADOOP-10135 writes to swift fs over partition size leave temp files and
-    empty output file (David Dobbins via stevel)
-
-    HADOOP-10129. Distcp may succeed when it fails (daryn)
-
-    HADOOP-10058. TestMetricsSystemImpl#testInitFirstVerifyStopInvokedImmediately
-    fails on trunk (Chen He via jeagles)
-
-    HADOOP-10162. Fix symlink-related test failures in
-    TestFileContextResolveAfs and TestStat in branch-2 (Mit Desai via Colin
-    Patrick McCabe)
-
-    HADOOP-8753. LocalDirAllocator throws "ArithmeticException: / by zero" when
-    there is no available space on configured local dir. (Benoy Antony via hitesh)
-
-    HADOOP-10106. Incorrect thread name in RPC log messages. (Ming Ma via jing9)
-
-    HADOOP-9611 mvn-rpmbuild against google-guice > 3.0 yields missing cglib
-    dependency (Timothy St. Clair via stevel)
-
-    HADOOP-10171. TestRPC fails intermittently on jkd7 (Mit Desai via jeagles)
-
-    HADOOP-10147  HDFS-5678 Upgrade to commons-logging 1.1.3 to avoid potential
-    deadlock in MiniDFSCluster (stevel)
-
-    HADOOP-10207. TestUserGroupInformation#testLogin is flaky (jxiang via
-    cmccabe)
-
-    HADOOP-10214. Fix multithreaded correctness warnings in ActiveStandbyElector
-    (Liang Xie via kasha)
-
-    HADOOP-10223. MiniKdc#main() should close the FileReader it creates. 
-    (Ted Yu via tucu)
-
-    HADOOP-10236. Fix typo in o.a.h.ipc.Client#checkResponse. (Akira Ajisaka
-    via suresh)
-
-    HADOOP-10146. Workaround JDK7 Process fd close bug (daryn)
-
-    HADOOP-10125. no need to process RPC request if the client connection
-    has been dropped (Ming Ma via brandonli)
-
-    HADOOP-10235. Hadoop tarball has 2 versions of stax-api JARs. (tucu)
-
-    HADOOP-10252. HttpServer can't start if hostname is not specified. (Jimmy
-    Xiang via atm)
-
-Release 2.3.0 - UNRELEASED
-
-  INCOMPATIBLE CHANGES
-
-  NEW FEATURES
-
-  IMPROVEMENTS
-
-    HADOOP-10046. Print a log message when SSL is enabled.
-    (David S. Wang via wang)
-
-    HADOOP-10079. log a warning message if group resolution takes too long.
-    (cmccabe)
-
-    HADOOP-9623. Update jets3t dependency to 0.9.0 (Amandeep Khurana via Colin
-    Patrick McCabe)
-
-    HADOOP-10132. RPC#stopProxy() should log the class of proxy when IllegalArgumentException 
-    is encountered (Ted yu via umamahesh)
-
-    HADOOP-10248. Property name should be included in the exception where property value 
-    is null (Akira AJISAKA via umamahesh)
-
-    HADOOP-10086. User document for authentication in secure cluster.
-    (Masatake Iwasaki via Arpit Agarwal)
-
-    HADOOP-10274 Lower the logging level from ERROR to WARN for UGI.doAs method
-    (Takeshi Miao via stack)
-
-  OPTIMIZATIONS
-
-    HADOOP-10142. Avoid groups lookup for unprivileged users such as "dr.who"
-    (vinay via cmccabe)
-
   BUG FIXES
 
     HADOOP-10028. Malformed ssl-server.xml.example. (Haohui Mai via jing9)
@@ -375,6 +267,102 @@ Release 2.3.0 - UNRELEASED
     HADOOP-10203. Connection leak in
     Jets3tNativeFileSystemStore#retrieveMetadata. (Andrei Savu via atm)
 
+    HADOOP-9964. Fix deadlocks in TestHttpServer by synchronize
+    ReflectionUtils.printThreadInfo. (Junping Du via llu)
+
+    HADOOP-9582. Non-existent file to "hadoop fs -conf" doesn't throw error
+    (Ashwin Shankar via jlowe)
+
+    HADOOP-9817. FileSystem#globStatus and FileContext#globStatus need to work
+    with symlinks. (Colin Patrick McCabe via Andrew Wang)
+
+    HADOOP-9875.  TestDoAsEffectiveUser can fail on JDK 7.  (Aaron T. Myers via
+    Colin Patrick McCabe)
+
+    HADOOP-9865.  FileContext#globStatus has a regression with respect to
+    relative path.  (Chuan Lin via Colin Patrick McCabe)
+
+    HADOOP-9909. org.apache.hadoop.fs.Stat should permit other LANG.
+    (Shinichi Yamashita via Andrew Wang)
+
+    HADOOP-9908. Fix NPE when versioninfo properties file is missing (todd)
+
+    HADOOP-9929. Insufficient permissions for a path reported as File Not
+    Found.  (Contributed by Colin Patrick McCabe)
+
+    HADOOP-9791. Add a test case covering long paths for new FileUtil access
+    check methods (ivanmi)
+
+    HADOOP-9981. globStatus should minimize its listStatus and getFileStatus
+    calls.  (Contributed by Colin Patrick McCabe)
+
+    HADOOP-10006. Compilation failure in trunk for
+    o.a.h.fs.swift.util.JSONUtil (Junping Du via stevel)
+
+    HADOOP-9016. HarFsInputStream.skip(long) must never return negative value.
+    (Ivan A. Veselovsky via jeagles)
+
+    HADOOP-10088. copy-nativedistlibs.sh needs to quote snappy lib dir.
+    (Raja Aluri via cnauroth)
+
+    HADOOP-10093. hadoop-env.cmd sets HADOOP_CLIENT_OPTS with a max heap size
+    that is too small. (Shanyu Zhao via cnauroth)
+
+    HADOOP-10094. NPE in GenericOptionsParser#preProcessForWindows().
+    (Enis Soztutar via cnauroth)
+
+    HADOOP-10100. MiniKDC shouldn't use apacheds-all artifact. (rkanter via tucu)
+
+    HADOOP-10107. Server.getNumOpenConnections may throw NPE. (Kihwal Lee via
+    jing9)
+
+    HADOOP-10135 writes to swift fs over partition size leave temp files and
+    empty output file (David Dobbins via stevel)
+
+    HADOOP-10129. Distcp may succeed when it fails (daryn)
+
+    HADOOP-10058. TestMetricsSystemImpl#testInitFirstVerifyStopInvokedImmediately
+    fails on trunk (Chen He via jeagles)
+
+    HADOOP-10162. Fix symlink-related test failures in
+    TestFileContextResolveAfs and TestStat in branch-2 (Mit Desai via Colin
+    Patrick McCabe)
+
+    HADOOP-8753. LocalDirAllocator throws "ArithmeticException: / by zero" when
+    there is no available space on configured local dir. (Benoy Antony via hitesh)
+
+    HADOOP-10106. Incorrect thread name in RPC log messages. (Ming Ma via jing9)
+
+    HADOOP-9611 mvn-rpmbuild against google-guice > 3.0 yields missing cglib
+    dependency (Timothy St. Clair via stevel)
+
+    HADOOP-10171. TestRPC fails intermittently on jkd7 (Mit Desai via jeagles)
+
+    HADOOP-10147  HDFS-5678 Upgrade to commons-logging 1.1.3 to avoid potential
+    deadlock in MiniDFSCluster (stevel)
+
+    HADOOP-10207. TestUserGroupInformation#testLogin is flaky (jxiang via
+    cmccabe)
+
+    HADOOP-10214. Fix multithreaded correctness warnings in ActiveStandbyElector
+    (Liang Xie via kasha)
+
+    HADOOP-10223. MiniKdc#main() should close the FileReader it creates. 
+    (Ted Yu via tucu)
+
+    HADOOP-10236. Fix typo in o.a.h.ipc.Client#checkResponse. (Akira Ajisaka
+    via suresh)
+
+    HADOOP-10146. Workaround JDK7 Process fd close bug (daryn)
+
+    HADOOP-10125. no need to process RPC request if the client connection
+    has been dropped (Ming Ma via brandonli)
+
+    HADOOP-10235. Hadoop tarball has 2 versions of stax-api JARs. (tucu)
+
+    HADOOP-10252. HttpServer can't start if hostname is not specified. (Jimmy
+    Xiang via atm)
+
 Release 2.2.0 - 2013-10-13
 
   INCOMPATIBLE CHANGES

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

@@ -1,6 +1,6 @@
 Hadoop HDFS Change Log
 
-Release 2.4.0 - UNRELEASED
+Release 2.3.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES
 
@@ -38,8 +38,46 @@ Release 2.4.0 - UNRELEASED
 
     HDFS-4949. Centralized cache management in HDFS (wang and cmccabe)
 
+
   IMPROVEMENTS
 
+    HDFS-5360. Improvement of usage message of renameSnapshot and
+    deleteSnapshot. (Shinichi Yamashita via wang)
+
+    HDFS-5331. make SnapshotDiff.java to a o.a.h.util.Tool interface implementation. 
+    (Vinayakumar B via umamahesh)
+
+    HDFS-4657.  Limit the number of blocks logged by the NN after a block
+    report to a configurable value.  (Aaron T. Myers via Colin Patrick
+    McCabe)
+
+    HDFS-5344. Make LsSnapshottableDir as Tool interface implementation. (Sathish via umamahesh)
+
+    HDFS-5544. Adding Test case For Checking dfs.checksum type as NULL value. (Sathish via umamahesh)
+
+    HDFS-5568. Support includeSnapshots option with Fsck command. (Vinayakumar B via umamahesh)
+
+    HDFS-4983. Numeric usernames do not work with WebHDFS FS. (Yongjun Zhang via
+    jing9)
+
+    HDFS-5592. statechangeLog of completeFile should be logged only in case of success. 
+    (Vinayakumar via umamahesh)
+
+    HDFS-5662. Can't decommission a DataNode due to file's replication factor
+    larger than the rest of the cluster size. (brandonli)
+
+    HDFS-5068. Convert NNThroughputBenchmark to a Tool to allow generic options.
+    (shv)
+
+    HDFS-5675. Add Mkdirs operation to NNThroughputBenchmark.
+    (Plamen Jeliazkov via shv)
+
+    HDFS-5677. Need error checking for HA cluster configuration.
+    (Vincent Sheffer via cos)
+
+    HDFS-5825. Use FileUtils.copyFile() to implement DFSTestUtils.copyFile().
+    (Haohui Mai via Arpit Agarwal)
+
     HDFS-5267. Remove volatile from LightWeightHashSet. (Junping Du via llu)
 
     HDFS-4278. Log an ERROR when DFS_BLOCK_ACCESS_TOKEN_ENABLE config is
@@ -229,6 +267,177 @@ Release 2.4.0 - UNRELEASED
 
   BUG FIXES
 
+    HDFS-5307. Support both HTTP and HTTPS in jsp pages (Haohui Mai via
+    brandonli)
+
+    HDFS-5291. Standby namenode after transition to active goes into safemode.
+    (jing9)
+
+    HDFS-5317. Go back to DFS Home link does not work on datanode webUI
+    (Haohui Mai via brandonli)
+
+    HDFS-5316. Namenode ignores the default https port (Haohui Mai via
+    brandonli)
+
+    HDFS-5281. COMMIT request should not block. (brandonli)
+
+    HDFS-5337. should do hsync for a commit request even there is no pending
+    writes (brandonli)
+
+    HDFS-5335. Hive query failed with possible race in dfs output stream.
+    (Haohui Mai via suresh)
+
+    HDFS-5322. HDFS delegation token not found in cache errors seen on secure HA 
+    clusters. (jing9)
+
+    HDFS-5329. Update FSNamesystem#getListing() to handle inode path in startAfter
+    token. (brandonli)
+
+    HDFS-5330. fix readdir and readdirplus for large directories (brandonli)
+
+    HDFS-5370. Typo in Error Message: different between range in condition
+    and range in error message. (Kousuke Saruta via suresh)
+
+    HDFS-5365. Fix libhdfs compile error on FreeBSD9. (Radim Kolar via cnauroth)
+    
+    HDFS-5347. Add HDFS NFS user guide. (brandonli)
+
+    HDFS-5403. WebHdfs client cannot communicate with older WebHdfs servers
+    post HDFS-5306. (atm)
+
+    HDFS-5171. NFS should create input stream for a file and try to share it
+    with multiple read requests. (Haohui Mai via brandonli)
+
+    HDFS-5413. hdfs.cmd does not support passthrough to any arbitrary class.
+    (cnauroth)
+
+    HDFS-5433. When reloading fsimage during checkpointing, we should clear
+    existing snapshottable directories. (Aaron T. Myers via wang)
+
+    HDFS-5432. TestDatanodeJsp fails on Windows due to assumption that loopback
+    address resolves to host name localhost. (cnauroth)
+
+    HDFS-5065. TestSymlinkHdfsDisable fails on Windows. (ivanmi)
+
+    HDFS-4633 TestDFSClientExcludedNodes fails sporadically if excluded nodes
+    cache expires too quickly  (Chris Nauroth via Sanjay)
+
+    HDFS-5037. Active NN should trigger its own edit log rolls. (wang)
+
+    HDFS-5035.  getFileLinkStatus and rename do not correctly check permissions
+    of symlinks.  (Andrew Wang via Colin Patrick McCabe)
+
+    HDFS-5456. NameNode startup progress creates new steps if caller attempts to
+    create a counter for a step that doesn't already exist.  (cnauroth)
+
+    HDFS-5458. Datanode failed volume threshold ignored if exception is thrown
+    in getDataDirsFromURIs. (Mike Mellenthin via wang)
+
+    HDFS-5252. Stable write is not handled correctly in someplace. (brandonli)
+
+    HDFS-5364. Add OpenFileCtx cache. (brandonli)
+
+    HDFS-5469. Add configuration property for the sub-directroy export path
+    (brandonli)
+
+    HDFS-5519. COMMIT handler should update the commit status after sync
+    (brandonli)
+
+    HDFS-5372. In FSNamesystem, hasReadLock() returns false if the current 
+    thread holds the write lock (Vinaykumar B via umamahesh)
+
+    HDFS-4516. Client crash after block allocation and NN switch before lease recovery for 
+    the same file can cause readers to fail forever (VinaayKumar B via umamahesh)
+
+    HDFS-5014. Process register commands with out holding BPOfferService lock. 
+    (Vinaykumar B via umamahesh)
+
+    HDFS-5288. Close idle connections in portmap (Haohui Mai via brandonli)
+
+    HDFS-5407. Fix typos in DFSClientCache (Haohui Mai via brandonli)
+
+    HDFS-5548. Use ConcurrentHashMap in portmap (Haohui Mai via brandonli)
+
+    HDFS-5577. NFS user guide update (brandonli)
+
+    HDFS-5563. NFS gateway should commit the buffered data when read request comes
+    after write to the same file (brandonli)
+
+    HDFS-4997. libhdfs doesn't return correct error codes in most cases (cmccabe)
+
+    HDFS-5587. add debug information when NFS fails to start with duplicate user
+    or group names (brandonli)
+
+    HDFS-5590. Block ID and generation stamp may be reused when persistBlocks is 
+    set to false. (jing9)
+
+    HDFS-5353. Short circuit reads fail when dfs.encrypt.data.transfer is 
+    enabled. (Colin Patrick McCabe via jing9)
+
+    HDFS-5283. Under construction blocks only inside snapshots should not be
+    counted in safemode threshhold.  (Vinay via szetszwo)
+
+    HDFS-5257. addBlock() retry should return LocatedBlock with locations else client 
+    will get AIOBE. (Vinay via jing9)
+
+    HDFS-5427. Not able to read deleted files from snapshot directly under 
+    snapshottable dir after checkpoint and NN restart. (Vinay via jing9)
+
+    HDFS-5443. Delete 0-sized block when deleting an under-construction file that 
+    is included in snapshot. (jing9)
+
+    HDFS-5476. Snapshot: clean the blocks/files/directories under a renamed 
+    file/directory while deletion. (jing9)
+
+    HDFS-5425. Renaming underconstruction file with snapshots can make NN failure on 
+    restart. (jing9 and Vinay)
+
+    HDFS-5474. Deletesnapshot can make Namenode in safemode on NN restarts. 
+    (Sathish via jing9)
+
+    HDFS-5504. In HA mode, OP_DELETE_SNAPSHOT is not decrementing the safemode threshold, 
+    leads to NN safemode. (Vinay via jing9)
+
+    HDFS-5428. Under construction files deletion after snapshot+checkpoint+nn restart 
+    leads nn safemode. (jing9)
+
+    HDFS-5074. Allow starting up from an fsimage checkpoint in the middle of a
+    segment. (Todd Lipcon via atm)
+
+    HDFS-4201. NPE in BPServiceActor#sendHeartBeat. (jxiang via cmccabe)
+
+    HDFS-5666. Fix inconsistent synchronization in BPOfferService (jxiang via cmccabe)
+    
+    HDFS-5657. race condition causes writeback state error in NFS gateway (brandonli)
+
+    HDFS-5661. Browsing FileSystem via web ui, should use datanode's fqdn instead of ip 
+    address. (Benoy Antony via jing9)
+
+    HDFS-5582. hdfs getconf -excludeFile or -includeFile always failed (sathish
+    via cmccabe)
+
+    HDFS-5671. Fix socket leak in DFSInputStream#getBlockReader. (JamesLi via umamahesh) 
+
+    HDFS-5649. Unregister NFS and Mount service when NFS gateway is shutting down.
+    (brandonli)
+
+    HDFS-5789. Some of snapshot APIs missing checkOperation double check in fsn. (umamahesh)
+
+    HDFS-5343. When cat command is issued on snapshot files getting unexpected result.
+    (Sathish via umamahesh)
+
+    HDFS-5297. Fix dead links in HDFS site documents. (Akira Ajisaka via
+    Arpit Agarwal)
+
+    HDFS-5830. WebHdfsFileSystem.getFileBlockLocations throws
+    IllegalArgumentException when accessing another cluster. (Yongjun Zhang via
+    Colin Patrick McCabe)
+
+    HDFS-5833. Fix SecondaryNameNode javadoc. (Bangtao Zhou via Arpit Agarwal)
+
+    HDFS-5844. Fix broken link in WebHDFS.apt.vm. (Akira Ajisaka via
+    Arpit Agarwal)
+
     HDFS-5034.  Remove debug prints from GetFileLinkInfo (Andrew Wang via Colin
     Patrick McCabe)
 
@@ -650,227 +859,6 @@ Release 2.4.0 - UNRELEASED
     HDFS-5724. modifyCacheDirective logging audit log command wrongly as
     addCacheDirective (Uma Maheswara Rao G via Colin Patrick McCabe)
 
-
-Release 2.3.0 - UNRELEASED
-
-  INCOMPATIBLE CHANGES
-
-  NEW FEATURES
-
-  IMPROVEMENTS
-
-    HDFS-5360. Improvement of usage message of renameSnapshot and
-    deleteSnapshot. (Shinichi Yamashita via wang)
-
-    HDFS-5331. make SnapshotDiff.java to a o.a.h.util.Tool interface implementation. 
-    (Vinayakumar B via umamahesh)
-
-    HDFS-4657.  Limit the number of blocks logged by the NN after a block
-    report to a configurable value.  (Aaron T. Myers via Colin Patrick
-    McCabe)
-
-    HDFS-5344. Make LsSnapshottableDir as Tool interface implementation. (Sathish via umamahesh)
-
-    HDFS-5544. Adding Test case For Checking dfs.checksum type as NULL value. (Sathish via umamahesh)
-
-    HDFS-5568. Support includeSnapshots option with Fsck command. (Vinayakumar B via umamahesh)
-
-    HDFS-4983. Numeric usernames do not work with WebHDFS FS. (Yongjun Zhang via
-    jing9)
-
-    HDFS-5592. statechangeLog of completeFile should be logged only in case of success. 
-    (Vinayakumar via umamahesh)
-
-    HDFS-5662. Can't decommission a DataNode due to file's replication factor
-    larger than the rest of the cluster size. (brandonli)
-
-    HDFS-5068. Convert NNThroughputBenchmark to a Tool to allow generic options.
-    (shv)
-
-    HDFS-5675. Add Mkdirs operation to NNThroughputBenchmark.
-    (Plamen Jeliazkov via shv)
-
-    HDFS-5677. Need error checking for HA cluster configuration.
-    (Vincent Sheffer via cos)
-
-    HDFS-5825. Use FileUtils.copyFile() to implement DFSTestUtils.copyFile().
-    (Haohui Mai via Arpit Agarwal)
-
-  OPTIMIZATIONS
-
-  BUG FIXES
-
-    HDFS-5307. Support both HTTP and HTTPS in jsp pages (Haohui Mai via
-    brandonli)
-
-    HDFS-5291. Standby namenode after transition to active goes into safemode.
-    (jing9)
-
-    HDFS-5317. Go back to DFS Home link does not work on datanode webUI
-    (Haohui Mai via brandonli)
-
-    HDFS-5316. Namenode ignores the default https port (Haohui Mai via
-    brandonli)
-
-    HDFS-5281. COMMIT request should not block. (brandonli)
-
-    HDFS-5337. should do hsync for a commit request even there is no pending
-    writes (brandonli)
-
-    HDFS-5335. Hive query failed with possible race in dfs output stream.
-    (Haohui Mai via suresh)
-
-    HDFS-5322. HDFS delegation token not found in cache errors seen on secure HA 
-    clusters. (jing9)
-
-    HDFS-5329. Update FSNamesystem#getListing() to handle inode path in startAfter
-    token. (brandonli)
-
-    HDFS-5330. fix readdir and readdirplus for large directories (brandonli)
-
-    HDFS-5370. Typo in Error Message: different between range in condition
-    and range in error message. (Kousuke Saruta via suresh)
-
-    HDFS-5365. Fix libhdfs compile error on FreeBSD9. (Radim Kolar via cnauroth)
-    
-    HDFS-5347. Add HDFS NFS user guide. (brandonli)
-
-    HDFS-5403. WebHdfs client cannot communicate with older WebHdfs servers
-    post HDFS-5306. (atm)
-
-    HDFS-5171. NFS should create input stream for a file and try to share it
-    with multiple read requests. (Haohui Mai via brandonli)
-
-    HDFS-5413. hdfs.cmd does not support passthrough to any arbitrary class.
-    (cnauroth)
-
-    HDFS-5433. When reloading fsimage during checkpointing, we should clear
-    existing snapshottable directories. (Aaron T. Myers via wang)
-
-    HDFS-5432. TestDatanodeJsp fails on Windows due to assumption that loopback
-    address resolves to host name localhost. (cnauroth)
-
-    HDFS-5065. TestSymlinkHdfsDisable fails on Windows. (ivanmi)
-
-    HDFS-4633 TestDFSClientExcludedNodes fails sporadically if excluded nodes
-    cache expires too quickly  (Chris Nauroth via Sanjay)
-
-    HDFS-5037. Active NN should trigger its own edit log rolls. (wang)
-
-    HDFS-5035.  getFileLinkStatus and rename do not correctly check permissions
-    of symlinks.  (Andrew Wang via Colin Patrick McCabe)
-
-    HDFS-5456. NameNode startup progress creates new steps if caller attempts to
-    create a counter for a step that doesn't already exist.  (cnauroth)
-
-    HDFS-5458. Datanode failed volume threshold ignored if exception is thrown
-    in getDataDirsFromURIs. (Mike Mellenthin via wang)
-
-    HDFS-5252. Stable write is not handled correctly in someplace. (brandonli)
-
-    HDFS-5364. Add OpenFileCtx cache. (brandonli)
-
-    HDFS-5469. Add configuration property for the sub-directroy export path
-    (brandonli)
-
-    HDFS-5519. COMMIT handler should update the commit status after sync
-    (brandonli)
-
-    HDFS-5372. In FSNamesystem, hasReadLock() returns false if the current 
-    thread holds the write lock (Vinaykumar B via umamahesh)
-
-    HDFS-4516. Client crash after block allocation and NN switch before lease recovery for 
-    the same file can cause readers to fail forever (VinaayKumar B via umamahesh)
-
-    HDFS-5014. Process register commands with out holding BPOfferService lock. 
-    (Vinaykumar B via umamahesh)
-
-    HDFS-5288. Close idle connections in portmap (Haohui Mai via brandonli)
-
-    HDFS-5407. Fix typos in DFSClientCache (Haohui Mai via brandonli)
-
-    HDFS-5548. Use ConcurrentHashMap in portmap (Haohui Mai via brandonli)
-
-    HDFS-5577. NFS user guide update (brandonli)
-
-    HDFS-5563. NFS gateway should commit the buffered data when read request comes
-    after write to the same file (brandonli)
-
-    HDFS-4997. libhdfs doesn't return correct error codes in most cases (cmccabe)
-
-    HDFS-5587. add debug information when NFS fails to start with duplicate user
-    or group names (brandonli)
-
-    HDFS-5590. Block ID and generation stamp may be reused when persistBlocks is 
-    set to false. (jing9)
-
-    HDFS-5353. Short circuit reads fail when dfs.encrypt.data.transfer is 
-    enabled. (Colin Patrick McCabe via jing9)
-
-    HDFS-5283. Under construction blocks only inside snapshots should not be
-    counted in safemode threshhold.  (Vinay via szetszwo)
-
-    HDFS-5257. addBlock() retry should return LocatedBlock with locations else client 
-    will get AIOBE. (Vinay via jing9)
-
-    HDFS-5427. Not able to read deleted files from snapshot directly under 
-    snapshottable dir after checkpoint and NN restart. (Vinay via jing9)
-
-    HDFS-5443. Delete 0-sized block when deleting an under-construction file that 
-    is included in snapshot. (jing9)
-
-    HDFS-5476. Snapshot: clean the blocks/files/directories under a renamed 
-    file/directory while deletion. (jing9)
-
-    HDFS-5425. Renaming underconstruction file with snapshots can make NN failure on 
-    restart. (jing9 and Vinay)
-
-    HDFS-5474. Deletesnapshot can make Namenode in safemode on NN restarts. 
-    (Sathish via jing9)
-
-    HDFS-5504. In HA mode, OP_DELETE_SNAPSHOT is not decrementing the safemode threshold, 
-    leads to NN safemode. (Vinay via jing9)
-
-    HDFS-5428. Under construction files deletion after snapshot+checkpoint+nn restart 
-    leads nn safemode. (jing9)
-
-    HDFS-5074. Allow starting up from an fsimage checkpoint in the middle of a
-    segment. (Todd Lipcon via atm)
-
-    HDFS-4201. NPE in BPServiceActor#sendHeartBeat. (jxiang via cmccabe)
-
-    HDFS-5666. Fix inconsistent synchronization in BPOfferService (jxiang via cmccabe)
-    
-    HDFS-5657. race condition causes writeback state error in NFS gateway (brandonli)
-
-    HDFS-5661. Browsing FileSystem via web ui, should use datanode's fqdn instead of ip 
-    address. (Benoy Antony via jing9)
-
-    HDFS-5582. hdfs getconf -excludeFile or -includeFile always failed (sathish
-    via cmccabe)
-
-    HDFS-5671. Fix socket leak in DFSInputStream#getBlockReader. (JamesLi via umamahesh) 
-
-    HDFS-5649. Unregister NFS and Mount service when NFS gateway is shutting down.
-    (brandonli)
-
-    HDFS-5789. Some of snapshot APIs missing checkOperation double check in fsn. (umamahesh)
-
-    HDFS-5343. When cat command is issued on snapshot files getting unexpected result.
-    (Sathish via umamahesh)
-
-    HDFS-5297. Fix dead links in HDFS site documents. (Akira Ajisaka via
-    Arpit Agarwal)
-
-    HDFS-5830. WebHdfsFileSystem.getFileBlockLocations throws
-    IllegalArgumentException when accessing another cluster. (Yongjun Zhang via
-    Colin Patrick McCabe)
-
-    HDFS-5833. Fix SecondaryNameNode javadoc. (Bangtao Zhou via Arpit Agarwal)
-
-    HDFS-5844. Fix broken link in WebHDFS.apt.vm. (Akira Ajisaka via
-    Arpit Agarwal)
-
 Release 2.2.0 - 2013-10-13
 
   INCOMPATIBLE CHANGES