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From aengin...@apache.org
Subject [03/10] hadoop git commit: HADOOP-11792. Remove all of the CHANGES.txt files.
Date Sat, 05 Mar 2016 04:24:05 GMT
http://git-wip-us.apache.org/repos/asf/hadoop/blob/1bc45461/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
deleted file mode 100644
index 0ddecaf..0000000
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ /dev/null
@@ -1,14611 +0,0 @@
-Hadoop HDFS Change Log
-
-Trunk (Unreleased)
-
-  INCOMPATIBLE CHANGES
-
-    HDFS-3034. Remove the deprecated DFSOutputStream.sync() method.  (szetszwo)
-
-    HDFS-5079. Cleaning up NNHAStatusHeartbeat.State from
-    DatanodeProtocolProtos. (Tao Luo via shv)
-
-    HDFS-5570. Deprecate hftp / hsftp and replace them with webhdfs / swebhdfs.
-    (wheat9)
-
-    HDFS-2538. option to disable fsck dots (Mohammad Kamrul Islam via aw)
-
-    HDFS-7302. Remove "downgrade" from "namenode -rollingUpgrade" startup
-    option since it may incorrectly finalize an ongoing rolling upgrade.
-    (Kai Sasaki via szetszwo)
-
-    HDFS-7985. WebHDFS should be always enabled. (Li Lu via wheat9)
-
-    HDFS-7281. Missing block is marked as corrupted block (Ming Ma via
-    Yongjun Zhang)
-
-    HDFS-8349. Remove .xml and documentation references to dfs.webhdfs.enabled.
-    (Ray Chiang via aajisaka)
-
-    HDFS-8241. Remove unused NameNode startup option -finalize.
-    (Brahma Reddy Battula via aajisaka)
- 
-    HDFS-8135. Remove the deprecated FSConstants class. (Li Lu via wheat9)
-
-    HDFS-8591. Remove support for deprecated configuration key
-    dfs.namenode.decommission.nodes.per.interval. (wang)
-
-    HDFS-8895. Remove deprecated BlockStorageLocation APIs. (wang)
-
-    HDFS-8981. Adding revision to data node jmx getVersion() method. (Siqi Li
-    via mingma)
-
-    HDFS-9085. Show renewer information in DelegationTokenIdentifier#toString.
-    (Zhihai Xu via cnauroth)
-
-    HDFS-9278. Fix preferredBlockSize typo in OIV XML output. (Nicole Pazmany via wang)
-
-    HDFS-5165. Remove the TotalFiles metrics. (Akira Ajisaka via wheat9)
-
-  NEW FEATURES
-
-    HDFS-3125. Add JournalService to enable Journal Daemon. (suresh)
-
-    HDFS-6440. Support more than 2 NameNodes. (Jesse Yates via atm)
-
-    HDFS-9057. allow/disallow snapshots via webhdfs
-    (Bramma Reddy Battula via vinayakumarb)
-
-    HDFS-9525. hadoop utilities need to support provided delegation
-    tokens (HeeSoo Kim via aw)
-
-    HDFS-9804. Allow long-running Balancer to login with keytab.
-    (Xiao Chen via zhz)
-
-  IMPROVEMENTS
-
-    HDFS-9653.  Added blocks pending deletion report to dfsadmin.  
-    (Weiwei Yang via eyang)
-
-    HDFS-4665. Move TestNetworkTopologyWithNodeGroup to common.
-    (Junping Du via llu)
-
-    HDFS-1620. Rename HdfsConstants -> HdfsServerConstants, FSConstants ->
-               HdfsConstants. (Harsh J Chouraria via atm)
-
-    HDFS-2197. Refactor RPC call implementations out of NameNode class (todd)
-
-    HDFS-2572. Remove unnecessary double-check in DN#getHostName. (harsh)
-
-    HDFS-2857. Cleanup BlockInfo class. (suresh)
-
-    HDFS-2786. Fix host-based token incompatibilities in DFSUtil. (Kihwal Lee
-    via jitendra)
-
-    HDFS-2878. Fix TestBlockRecovery and move it back into main test directory.
-    (todd)
-
-    HDFS-2655. BlockReaderLocal#skip performs unnecessary IO.
-    (Brandon Li via jitendra) 
-
-    HDFS-3009. Remove duplicate code in DFSClient#isLocalAddress by using 
-    NetUtils. (Hari Mankude via suresh)
-
-    HDFS-3002. TestNameNodeMetrics need not wait for metrics update.
-    (suresh)
-
-    HDFS-3016. Security in unit tests. (Jaimin Jetly via jitendra)
-
-    HDFS-3030. Remove getProtocolVersion and getProtocolSignature from translators.
-    (jitendra)
-
-    HDFS-3111. Missing license headers in trunk. (umamahesh)
-
-    HDFS-3091. Update the usage limitations of ReplaceDatanodeOnFailure policy in
-    the config description for the smaller clusters. (szetszwo via umamahesh)
-
-    HDFS-309. FSEditLog should log progress during replay. (Sho Shimauchi
-    via todd)
-
-    HDFS-3131. Improve TestStorageRestore. (Brandon Li via atm)
-
-    HDFS-3178. Add states and state handler for journal synchronization in
-    JournalService.  (szetszwo)
-
-    HDFS-3273. Refactor BackupImage and FSEditLog, and rename
-    JournalListener.rollLogs(..) to startLogSegment(..).  (szetszwo)
-
-    HDFS-3292. Remove the deprecated DiskStatus, getDiskStatus(), getRawUsed()
-    and getRawCapacity() from DistributedFileSystem.  (Arpit Gupta via szetszwo)
-
-    HADOOP-8285. HDFS changes for Use ProtoBuf for RpcPayLoadHeader. (sanjay
-    radia)
-
-    HDFS-2743. Streamline usage of bookkeeper journal manager. 
-    (Ivan Kelly via umamahesh)
-
-    HDFS-3293. Add toString(), equals(..) and hashCode() to JournalInfo.
-    (Hari Mankude via szetszwo)
-
-    HDFS-3197. Incorrect class comments in a few tests. (Andy Isaacson via eli)
-
-    HDFS-3476. Correct the default used in TestDFSClientRetries.busyTest()
-    after HDFS-3462 (harsh)
-
-    HDFS-3478. Test quotas with Long.Max_Value. (Sujay Rau via eli)
-
-    HDFS-3630 Modify TestPersistBlocks to use both flush and hflush  (sanjay)
-
-    HDFS-3768. Exception in TestJettyHelper is incorrect. 
-    (Eli Reisman via jghoman)
-
-    HDFS-2580. NameNode#main(...) can make use of GenericOptionsParser. (harsh)
-
-    HDFS-2127. Add a test that ensure AccessControlExceptions contain
-    a full path. (Stephen Chu via eli)
-
-    HDFS-3995. Use DFSTestUtil.createFile() for file creation and 
-    writing in test cases. (Jing Zhao via suresh)
-
-    HDFS-3735. NameNode WebUI should allow sorting live datanode list by fields
-    Block Pool Used, Block Pool Used(%) and Failed Volumes.
-    (Brahma Reddy Battula via suresh)
-
-    HDFS-4052. BlockManager#invalidateWork should print log outside the lock.
-    (Jing Zhao via suresh)
-
-    HDFS-3358. Specify explicitly that the NN UI status total is talking
-    of persistent objects on heap. (harsh)
-
-    HDFS-4904. Remove JournalService. (Arpit Agarwal via cnauroth)
-
-    HDFS-5041. Add the time of last heartbeat to dead server Web UI (Shinichi
-    Yamashita via brandonli)
-
-    HDFS-5721. sharedEditsImage in Namenode#initializeSharedEdits() should be 
-    closed before method returns. (Ted Yu via junping_du)
-
-    HDFS-6228. comments typo fix for FsDatasetImpl.java (zhaoyunjiong via umamahesh)
-
-    HDFS-6246. Remove 'dfs.support.append' flag from trunk code. (umamahesh)
-
-    HDFS-6609. Use DirectorySnapshottableFeature to represent a snapshottable
-    directory. (Jing Zhao via wheat9)
-
-    HDFS-7591. hdfs classpath command should support same options as hadoop
-    classpath (Varun Saxena via Arpit Agarwal)
-
-    HDFS-316. Balancer should run for a configurable # of iterations (Xiaoyu
-    Yao via aw)
-
-    HDFS-7322. deprecate sbin/hadoop-daemon.sh (aw)
-
-    HDFS-7668. Convert site documentation from apt to markdown (Masatake
-    Iwasaki via aw)
-
-    HDFS-7460. Rewrite httpfs to use new shell framework (John Smith via aw)
-
-    HDFS-6353. Check and make checkpoint before stopping the NameNode. (jing9)
-
-    HDFS-5033. Bad error message for fs -put/copyFromLocal if user
-    doesn't have permissions to read the source (Darrell Taylor via aw)
-
-    HDFS-9182. Cleanup the findbugs and other issues after HDFS EC merged to trunk.
-    (umamahesh)
-
-    HDFS-8632. Add InterfaceAudience annotation to the erasure coding classes.
-    (Rakesh R via wang)
-
-    HDFS-9070. Allow fsck display pending replica location information for
-    being-written blocks. (GAO Rui via jing9)
-
-    HDFS-9261. Erasure Coding: Skip encoding the data cells if all the parity data 
-    streamers are failed for the current block group. (Rakesh R via umamahesh)
-
-    HDFS-9323. Randomize the DFSStripedOutputStreamWithFailure tests. (szetszwo)
-
-    HDFS-8777. Erasure Coding: add tests for taking snapshots on EC files. 
-    (Rakesh R via zhz)
-
-    HADOOP-11684. S3a to use thread pool that blocks clients.
-    (Thomas Demoor and Aaron Fabbri via lei)
-
-    HDFS-9234. WebHdfs: getContentSummary() should give quota for storage types.
-    (Surendra Singh Lilhore via xyao)
-
-    HDFS-8968. Erasure coding: a comprehensive I/O throughput benchmark tool.
-    (Rui Li via zhz)
-
-    HDFS-8831. Trash Support for deletion in HDFS encryption zone. (xyao)
-
-    HDFS-9582. TestLeaseRecoveryStriped file missing Apache License header 
-    and not well formatted. (umamahesh)
-
-    HDFS-9494. Parallel optimization of DFSStripedOutputStream#flushAllInternals.
-    (Gao Rui via jing9)
-
-    HDFS-9260. Improve the performance and GC friendliness of NameNode startup
-    and full block reports (Staffan Friberg via cmccabe)
-
-    HDFS-9795. OIV Delimited should show which files are ACL-enabled (lei)
-
-    HDFS-9829. Erasure Coding: Improve few exception handling logic of
-    ErasureCodingWorker. (Rakesh R via jing9)
-
-    HDFS-9838. Refactor the excessReplicateMap to a class.  (szetszwo)
-
-    HDFS-9733. Refactor DFSClient#getFileChecksum and DataXceiver#blockChecksum
-    (Kai Zheng via umamahesh)
-
-  OPTIMIZATIONS
-
-  BUG FIXES
- 
-    HADOOP-9635 Fix potential Stack Overflow in DomainSocket.c (V. Karthik Kumar
-                via cmccabe)
-
-    HDFS-2299. TestOfflineEditsViewer is failing on trunk. (Uma Maheswara Rao G
-               via atm)
-    HDFS-2310. TestBackupNode fails since HADOOP-7524 went in.
-               (Ivan Kelly via todd)
-
-    HDFS-2313. Rat excludes has a typo for excluding editsStored files. (atm)
-
-    HDFS-2314. MRV1 test compilation broken after HDFS-2197 (todd)
-
-    HDFS-46.   Change default namespace quota of root directory from
-    Integer.MAX_VALUE to Long.MAX_VALUE. (Uma Maheswara Rao G via szetszwo)
-
-    HDFS-2373. Commands using WebHDFS and hftp print unnecessary debug 
-    info on the console with security enabled. (Arpit Gupta via suresh)
-
-    HDFS-2776. Missing interface annotation on JournalSet. 
-    (Brandon Li via jitendra)
-
-    HDFS-3037. TestMulitipleNNDataBlockScanner#testBlockScannerAfterRestart is
-    racy. (atm)
-
-    HDFS-3116. Typo in fetchdt error message. (AOE Takashi via atm)
-
-    HDFS-3126. Journal stream from Namenode to BackupNode needs to have 
-    timeout. (Hari Mankude via suresh)
-
-    HDFS-3121. Add HDFS tests for HADOOP-8014 change. (John George via
-    suresh)
-
-    HDFS-3119. Overreplicated block is not deleted even after the replication 
-    factor is reduced after sync follwed by closing that file. (Ashish Singhi 
-    via umamahesh)
-
-    HDFS-3265. PowerPc Build error. (Kumar Ravi via mattf)
-
-    HDFS-2312. FSNamesystem javadoc incorrectly says its for DNs. (harsh)
-
-    HDFS-3163. TestHDFSCLI.testAll fails if the user name is not all lowercase.
-    (Brandon Li via atm)
-
-    HDFS-3462. TestDFSClientRetries.busyTest() should restore default
-    xceiver count in the config. (Madhukara Phatak via harsh)
-
-    HDFS-3550. Fix raid javadoc warnings. (Jason Lowe via daryn)
-
-    HDFS-3549. Fix dist tar build fails in hadoop-hdfs-raid project. (Jason Lowe via daryn)
-
-    HDFS-3614. Revert unused MiniDFSCluster constructor from HDFS-3049.
-    (acmurthy via eli)
-
-    HDFS-3792. Fix two findbugs introduced by HDFS-3695 (todd)
-
-    HDFS-3827. TestHASafeMode#assertSafemode method should be made static.
-    (Jing Zhao via suresh)
-
-    HDFS-3834. Remove unused static fields NAME, DESCRIPTION and Usage from
-    Command. (Jing Zhao via suresh)
-
-    HDFS-2434. TestNameNodeMetrics.testCorruptBlock fails intermittently.
-    (Jing Zhao via suresh)
-
-    HDFS-4067. TestUnderReplicatedBlocks intermittently fails due to 
-    ReplicaAlreadyExistsException. (Jing Zhao via suresh)
-
-    HDFS-4115. TestHDFSCLI.testAll fails one test due to number format.
-    (Trevor Robinson via suresh)
-
-    HDFS-4105. The SPNEGO user for secondary namenode should use the web 
-    keytab. (Arpit Gupta via jitendra)
-
-    HDFS-4003. test-patch should build the common native libs before
-    running hdfs tests. (Colin Patrick McCabe via eli)
-
-    HDFS-4260 Fix HDFS tests to set test dir to a valid HDFS path as opposed
-    to the local build path (Chri Nauroth via Sanjay)
-
-    HDFS-4310. fix test org.apache.hadoop.hdfs.server.datanode.
-    TestStartSecureDataNode (Ivan A. Veselovsky via atm)
-
-    HDFS-4275. MiniDFSCluster-based tests fail on Windows due to failure
-    to delete test namenode directory. (Chris Nauroth via suresh)
-
-    HDFS-4338. TestNameNodeMetrics#testCorruptBlock is flaky. (Andrew Wang via
-    atm)
-
-    HDFS-4391. TestDataTransferKeepalive fails when tests are executed in a
-    certain order. (Andrew Wang via atm)
-
-    HDFS-4757. Update FSDirectory#inodeMap when replacing an INodeDirectory
-    while setting quota.  (Jing Zhao via szetszwo)
-
-    HDFS-4761. When resetting FSDirectory, the inodeMap should also be reset.
-    (Jing Zhao via szetszwo)
-
-    HDFS-4687. TestDelegationTokenForProxyUser#testWebHdfsDoAs is flaky with
-    JDK7. (Andrew Wang via atm)
-
-    HDFS-3934. duplicative dfs_hosts entries handled wrong. (Colin Patrick
-    McCabe)
-
-    HDFS-5719. FSImage#doRollback() should close prevState before return
-    (Ted Yu via brandonli)
-
-    HDFS-5794. Fix the inconsistency of layout version number of 
-    ADD_DATANODE_AND_STORAGE_UUIDS between trunk and branch-2. (jing9)
-
-    HDFS-6893. crypto subcommand is not sorted properly in hdfs's hadoop_usage
-    (David Luo via aw)
-
-    HDFS-6981. Fix DN upgrade with layout version change. (Arpit Agarwal)
-
-    HDFS-7204. balancer doesn't run as a daemon (aw)
-
-    HDFS-7319. Remove dead link to HFTP documentation from index.xml.
-    (Masatake Iwasaki via wheat9)
-
-    HDFS-7407. Minor typo in privileged pid/out/log names (aw)
-
-    HDFS-7581. HDFS documentation needs updating post-shell rewrite (aw)
-
-    HADOOP-11484. hadoop-mapreduce-client-nativetask fails to build on ARM
-    AARCH64 due to x86 asm statements (Edward Nevill via Colin P. McCabe)
-
-    HDFS-7667. Various typos and improvements to HDFS Federation doc
-    (Charles Lamb via aw)
-
-    HDFS-3750. API docs don't include HDFS (Jolly Chen via aw)
-
-    HDFS-7320. The appearance of hadoop-hdfs-httpfs site docs is inconsistent 
-    (Masatake Iwasaki via aw)
-
-    HDFS-7670. HDFS Quota guide has typos, incomplete command lines
-    (Brahma Reddy Battula via aw)
-
-    HDFS-7669. HDFS Design Doc references commands that no longer exist.
-    (Brahma Reddy Battula via aw)
-
-    HDFS-7755. httpfs shell code has hardcoded path to bash (Dmitry
-    Sivachenko via aw)
-
-    HDFS-7711. Fix various typos in ClusterSetup.md.
-    (Brahma Reddy Battula via wheat9)
-
-    HDFS-7791. dfs count -v should be added to quota documentation (Akira
-    AJISAKA via aw)
-
-    HDFS-7803. Wrong command mentioned in HDFSHighAvailabilityWithQJM
-    documentation (Arshad Mohammad via aw)
-
-    HDFS-4681. TestBlocksWithNotEnoughRacks#testCorruptBlockRereplicatedAcrossRacks 
-    fails using IBM java (Ayappan via aw)
-
-    HDFS-8110. Remove unsupported 'hdfs namenode -rollingUpgrade downgrade'
-    from document. (J.Andreina via aajisaka)
-
-    HDFS-7673. synthetic load generator docs give incorrect/incomplete commands
-    (Brahma Reddy Battula via aw)
-
-    HDFS-8332. DFS client API calls should check filesystem closed
-    (Rakesh R via umamahesh)
-
-    HDFS-8412. Fix the test failures in HTTPFS. (umamahesh)
-
-    HDFS-8627. NPE thrown if unable to fetch token from Namenode
-    (J.Andreina via vinayakumarb)
-
-    HDFS-8657. Update docs for mSNN. (Jesse Yates via atm)
-
-    HDFS-8800. hdfs --daemon stop namenode corrupts logs (John Smith via aw)
-
-    HDFS-9204. DatanodeDescriptor#PendingReplicationWithoutTargets is wrongly
-    calculated. (Mingliang Liu via jing9)
-
-    HDFS-9217. Fix broken findbugsExcludeFile.xml for hadoop-hdfs-client module.
-    (Mingliang Liu via aajisaka)
-
-    HDFS-9423. Fix intermittent failure of TestEditLogTailer.
-    (Masatake Iwasaki via waltersu4549)
-
-    HDFS-9580. TestComputeInvalidateWork#testDatanodeReRegistration failed
-    due to unexpected number of invalidate blocks. (Wei-Chiu Chuang via zhz)
-
-    HDFS-9376. TestSeveralNameNodes fails occasionally.
-    (Masatake Iwasaki via cnauroth)
-
-    HDFS-9615. Fix variable name typo in DFSConfigKeys. (Ray Chiang via
-    Arpit Agarwal)
-
-    HDFS-9646. ErasureCodingWorker may fail when recovering data blocks with
-    length less than the first internal block. (jing9)
-
-    HDFS-9789. Correctly update DataNode's scheduled block size when writing
-    small EC file. (jing9)
-
-    HDFS-9794. Streamer threads may leak if failure happens when closing the
-    striped outputstream. (jing9)
-
-    HDFS-9818. Correctly handle EC reconstruction work caused by not enough
-    racks. (jing9)
-
-    HDFS-9837. BlockManager#countNodes should be able to detect duplicated
-    internal blocks. (jing9)
-
-    HDFS-9734. Refactoring of checksum failure report related codes.
-    (Kai Zheng via zhz)
-
-    HDFS-9866. BlockManager#chooseExcessReplicasStriped may weaken rack fault
-    tolerance. (jing9)
-
-    HDFS-9867. Missing block exception should carry locatedBlocks information.
-    (Mingliang Liu via jing9)
-
-    HDFS-9876. shouldProcessOverReplicated should not count number of pending
-    replicas. (jing9)
-
-    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 ( zhz )
-
-      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)
-
-      HDFS-8212. DistributedFileSystem.createErasureCodingZone should pass schema
-      in FileSystemLinkResolver. (szetszwo via Zhe Zhang)
-
-      HDFS-8024. Erasure Coding: ECworker frame, basics, bootstraping and configuration.
-      (umamahesh)
-
-      HDFS-8156. Add/implement necessary APIs even we just have the system default
-      schema. (Kai Zheng via Zhe Zhang)
-
-      HDFS-8136. Client gets and uses EC schema when reads and writes a stripping
-      file. (Kai Sasaki via Kai Zheng)
-
-      HDFS-8233. Fix DFSStripedOutputStream#getCurrentBlockGroupBytes when the last
-      stripe is at the block group boundary. (jing9)
-
-      HDFS-8223. Should calculate checksum for parity blocks in DFSStripedOutputStream.
-      (Yi Liu via jing9)
-
-      HDFS-8228. Erasure Coding: SequentialBlockGroupIdGenerator#nextValue may cause
-      block id conflicts (Jing Zhao via Zhe Zhang)
-
-      HDFS-8033. Erasure coding: stateful (non-positional) read from files in
-      striped layout (Zhe Zhang)
-
-      HDFS-8230. Erasure Coding: Ignore DatanodeProtocol#DNA_ERASURE_CODING_RECOVERY
-      commands from standbynode if any (vinayakumarb)
-
-      HDFS-8189. ClientProtocol#createErasureCodingZone API was wrongly annotated
-      as Idempotent (vinayakumarb)
-
-      HDFS-8235. Erasure Coding: Create DFSStripedInputStream in DFSClient#open.
-      (Kai Sasaki via jing9)
-
-      HDFS-8272. Erasure Coding: simplify the retry logic in DFSStripedInputStream
-      (stateful read). (Jing Zhao via Zhe Zhang)
-
-      HDFS-8282. Erasure coding: move striped reading logic to StripedBlockUtil.
-      (Zhe Zhang)
-
-      HDFS-8183. Erasure Coding: Improve DFSStripedOutputStream closing of
-      datastreamer threads. (Rakesh R via Zhe Zhang)
-
-      HDFS-8308. Erasure Coding: NameNode may get blocked in waitForLoadingFSImage()
-      when loading editlog. (jing9)
-
-      HDFS-7949. WebImageViewer need support file size calculation with striped
-      blocks. (Rakesh R via Zhe Zhang)
-
-      HDFS-8316. Erasure coding: refactor EC constants to be consistent with HDFS-8249.
-      (Zhe Zhang via jing9)
-
-      HDFS-8281. Erasure Coding: implement parallel stateful reading for striped layout.
-      (jing9)
-
-      HDFS-8137. Send the EC schema to DataNode via EC encoding/recovering command(umamahesh)
-
-      HDFS-8242. Erasure Coding: XML based end-to-end test for ECCli commands
-      (Rakesh R via vinayakumarb)
-
-      HDFS-8324. Add trace info to DFSClient#getErasureCodingZoneInfo(..) (vinayakumarb via
-      umamahesh)
-
-      HDFS-7672. Handle write failure for stripping blocks and refactor the
-      existing code in DFSStripedOutputStream and StripedDataStreamer.  (szetszwo)
-
-      HDFS-7348. Erasure Coding: DataNode reconstruct striped blocks.
-      (Yi Liu via Zhe Zhang)
-
-      HDFS-8334. Erasure coding: rename DFSStripedInputStream related test
-      classes. (Zhe Zhang)
-
-      HDFS-8129. Erasure Coding: Maintain consistent naming for Erasure Coding related classes - EC/ErasureCoding
-      (umamahesh)
-
-      HDFS-8203. Erasure Coding: Seek and other Ops in DFSStripedInputStream.
-      (Yi Liu via jing9)
-
-      HDFS-8289. Erasure Coding: add ECSchema to HdfsFileStatus. (Yong Zhang via
-      jing9)
-
-      HDFS-8355. Erasure Coding: Refactor BlockInfo and BlockInfoUnderConstruction.
-      (Tsz Wo Nicholas Sze via jing9)
-
-      HDFS-7678. Erasure coding: DFSInputStream with decode functionality (pread).
-      (Zhe Zhang)
-
-      HDFS-8372. Erasure coding: compute storage type quotas for striped files,
-      to be consistent with HDFS-8327. (Zhe Zhang via jing9)
-
-      HDFS-8368. Erasure Coding: DFS opening a non-existent file need to be
-      handled properly (Rakesh R via zhz)
-
-      HDFS-8363. Erasure Coding: DFSStripedInputStream#seekToNewSource. (yliu)
-
-      HDFS-8195. Erasure coding: Fix file quota change when we complete/commit
-      the striped blocks. (Takuya Fukudome via zhz)
-
-      HDFS-8364. Erasure coding: fix some minor bugs in EC CLI
-      (Walter Su via vinayakumarb)
-
-      HDFS-8391. NN should consider current EC tasks handling count from DN while
-      assigning new tasks. (umamahesh)
-
-      HDFS-8367. BlockInfoStriped uses EC schema. (Kai Sasaki via Kai Zheng)
-
-      HDFS-8352. Erasure Coding: test webhdfs read write stripe file. (waltersu4549)
-
-      HDFS-8417. Erasure Coding: Pread failed to read data starting from not-first stripe.
-      (Walter Su via jing9)
-
-      HDFS-8418. Fix the isNeededReplication calculation for Striped block in NN.
-      (Yi Liu via jing9)
-
-      HDFS-8320. Erasure coding: consolidate striping-related terminologies. (zhz)
-
-      HDFS-8366. Erasure Coding: Make the timeout parameter of polling blocking queue
-      configurable in DFSStripedOutputStream. (Li Bo)
-
-      HDFS-8378. Erasure Coding: Few improvements for the erasure coding worker.
-      (Rakesh R via waltersu4549)
-
-      HDFS-8375. Add cellSize as an XAttr to ECZone. ( Vinayakumar B via zhz).
-
-      HDFS-8428. Erasure Coding: Fix the NullPointerException when deleting file.
-      (Yi Liu via zhz).
-
-      HDFS-8323. Bump GenerationStamp for write faliure in DFSStripedOutputStream.
-      (Tsz Wo Nicholas Sze via jing9)
-
-      HDFS-8427. Remove dataBlockNum and parityBlockNum from BlockInfoStriped.
-      (Kai Sasaki via jing9)
-
-      HDFS-8186. Erasure coding: Make block placement policy for EC file configurable.
-      (Walter Su via zhz)
-
-      HDFS-8294. Erasure Coding: Fix Findbug warnings present in erasure coding.
-      (Rakesh R via zhz)
-
-      HDFS-8441. Erasure Coding: make condition check earlier for setReplication.
-      (waltersu4549)
-
-      HDFS-7768. Change fsck to support EC files.  (Takanobu Asanuma via szetszwo)
-
-      HDFS-8382. Remove chunkSize and initialize from erasure coder. (Kai Zheng)
-
-      HDFS-8408. Revisit and refactor ErasureCodingInfo (vinayakumarb)
-
-      HDFS-8479. Erasure coding: fix striping related logic in FSDirWriteFileOp to
-      sync with HDFS-8421. (Zhe Zhang via jing9)
-
-      HDFS-8481. Erasure coding: remove workarounds in client side stripped blocks
-      recovering. (zhz)
-
-      HDFS-8336. Expose some administrative erasure coding operations to HdfsAdmin
-      (Uma Maheswara Rao G via vinayakumarb)
-
-      HDFS-8444. Erasure Coding: fix cannot rename a zone dir
-      (Walter Su via vinayakumarb)
-
-      HDFS-8517. Fix a decoding issue in stripped block recovering in client side.
-      (Kai Zheng via jing9)
-
-      HDFS-8453. Erasure coding: properly handle start offset for internal blocks
-      in a block group. (Zhe Zhang via jing9)
-
-      HDFS-7621. Erasure Coding: update the Balancer/Mover data migration logic.
-      (Walter Su via zhz)
-
-      HDFS-8328. Follow-on to update decode for DataNode striped blocks
-      reconstruction. (yliu)
-
-      HDFS-8319. Erasure Coding: support decoding for stateful read.
-      (Jing Zhao via zhz)
-
-      HDFS-8460. Erasure Coding: stateful read result doesn't match data
-      occasionally because of flawed test. (Walter Su via zhz)
-
-      HDFS-8556. Erasure Coding: Fix usage of 'createZone' (vinayakumarb)
-
-      HDFS-8571. Fix TestErasureCodingCli test (Vinayakumar B via waltersu4549)
-
-      HDFS-8450. Erasure Coding: Consolidate erasure coding zone related
-      implementation into a single class (Rakesh R via vinayakumarb)
-
-      HDFS-8585. Erasure Coding: Remove dataBlockNum and parityBlockNum from
-      StripedBlockProto. (Yi Liu via jing9)
-
-      HDFS-8559. Erasure Coding: fix non-protobuf fsimage for striped blocks.
-      (Jing Zhao via yliu)
-
-      HDFS-8580. Erasure coding: Persist cellSize in BlockInfoStriped and
-      StripedBlocksFeature. (Walter Su via jing9)
-
-      HDFS-8466. Refactor BlockInfoContiguous and fix NPE in
-      TestBlockInfo#testCopyConstructor() (vinayakumarb)
-
-      HDFS-8254. Avoid assigning a leading streamer in StripedDataStreamer to
-      tolerate datanode failure. (Tsz Wo Nicholas Sze via jing9)
-
-      HDFS-8543. Erasure Coding: processOverReplicatedBlock() handles striped block.
-      (Walter Su via jing9)
-
-      HDFS-8602. Erasure Coding: Client can't read(decode) the EC files which have
-      corrupt blocks. (jing9 and Kai Sasaki)
-
-      HDFS-8567. Erasure Coding: SafeMode handles file smaller than a full stripe.
-      (Walter Su via jing9)
-
-      HDFS-8253. DFSStripedOutputStream.closeThreads releases cellBuffers
-      multiple times.  (Kai Sasaki via szetszwo)
-
-      HDFS-8468. 2 RPC calls for every file read in DFSClient#open(..) resulting in
-      double Audit log entries (vinayakumarb)
-
-      HDFS-8684. Erasure Coding: fix some block number calculation for striped
-      block. (yliu)
-
-      HDFS-8461. Erasure coding: fix priority level of UnderReplicatedBlocks for
-      striped block. (Walter Su via jing9)
-
-      HDFS-8719. Erasure Coding: client generates too many small packets when
-      writing parity data. (Li Bo via waltersu4549)
-
-      HDFS-8563. Erasure Coding: fsck handles file smaller than a full stripe.
-      (Walter Su via jing9)
-
-      HDFS-8484. Erasure coding: Two contiguous blocks occupy IDs belong to same
-      striped group. (Walter Su via jing9)
-
-      HDFS-8744. Erasure Coding: the number of chunks in packet is not updated
-      when writing parity data. (Li Bo)
-
-      HDFS-8669. Erasure Coding: handle missing internal block locations in
-      DFSStripedInputStream. (jing9)
-
-      HDFS-8702. Erasure coding: update BlockManager.blockHasEnoughRacks(..) logic
-      for striped block. (Kai Sasaki via jing9)
-
-      HDFS-8734. Erasure Coding: fix one cell need two packets. (Walter Su via
-      jing9)
-
-      HDFS-8619. Erasure Coding: revisit replica counting for striped blocks.
-      (Jing Zhao via yliu)
-
-      HDFS-8058. Erasure coding: use BlockInfo[] for both striped and contiguous
-      blocks in INodeFile. (Zhe Zhang and Yi Liu via zhz)
-
-      HDFS-8787. Erasure coding: rename BlockInfoContiguousUC and BlockInfoStripedUC
-      to be consistent with trunk. (zhz)
-
-      HDFS-8433. Erasure coding: set blockToken in LocatedStripedBlock.(waltersu4549)
-
-      HDFS-8760. Erasure Coding: reuse BlockReader when reading the same block in pread.
-      (jing9)
-
-      HDFS-8781. Erasure Coding: Correctly handle BlockManager#InvalidateBlocks for
-      striped block. (Yi Liu via jing9)
-
-      HDFS-8813. Erasure Coding: Client no need to decode missing parity blocks.
-      (Walter Su via jing9)
-
-      HDFS-8798. Erasure Coding: fix DFSStripedInputStream/DFSStripedOutputStream
-      re-fetch token when expired. (Walter Su via jing9)
-
-      HDFS-8769. Erasure coding: unit test for SequentialBlockGroupIdGenerator.
-      (Rakesh R via waltersu4549)
-
-      HDFS-8202. Improve end to end stirpping file test to add erasure recovering
-      test. (Xinwei Qin via zhz)
-
-      HDFS-8804. Erasure Coding: use DirectBufferPool in DFSStripedInputStream for
-      buffer allocation. (jing9)
-
-      HDFS-8399. Erasure Coding: unit test the behaviour of BlockManager recovery
-      work for the deleted blocks. (Rakesh R via zhz)
-
-      HDFS-8857. Erasure Coding: Fix ArrayIndexOutOfBoundsException in
-      TestWriteStripedFileWithFailure. (Li Bo)
-
-      HDFS-8827. Erasure Coding: Fix NPE when NameNode processes over-replicated
-      striped blocks. (Walter Su and Takuya Fukudome via jing9)
-
-      HDFS-8854. Erasure coding: add ECPolicy to replace schema+cellSize in
-      hadoop-hdfs. (Walter Su via zhz)
-
-      HDFS-8220. Erasure Coding: StripedDataStreamer fails to handle the
-      blocklocations which doesn't satisfy BlockGroupSize. (Rakesh R via zhz)
-
-      HDFS-8838. Erasure Coding: Tolerate datanode failures in DFSStripedOutputStream
-      when the data length is small. (szetszwo via waltersu4549)
-
-      HDFS-8909. Erasure coding: update BlockInfoContiguousUC and BlockInfoStripedUC
-      to use BlockUnderConstructionFeature. (Jing Zhao via waltersu4549)
-
-      HDFS-8937. Erasure coding: do not throw exception when setting replication on
-      EC file. (Gao Rui via jing9)
-
-      HDFS-8978. Erasure coding: fix 2 failed tests of DFSStripedOutputStream.
-      (Walter Su via jing9)
-
-      HDFS-8833. Erasure coding: store EC schema and cell size in INodeFile and
-      eliminate notion of EC zones. (zhz)
-
-      HDFS-8853. Erasure Coding: Provide ECSchema validation when setting EC
-      policy. (andreina via zhz)
-
-      HDFS-8975. Erasure coding : Fix random failure in TestSafeModeWithStripedFile
-      (J.Andreina via vinayakumarb)
-
-      HDFS-7351. Document the HDFS Erasure Coding feature.
-      (umamahesh and Zhe Zhang via wang)
-
-      HDFS-8899. Erasure Coding: use threadpool for EC recovery tasks on DataNode.
-      (Rakesh R via zhz)
-
-      HDFS-9088. Cleanup erasure coding documentation. (wang via zhz)
-
-      HDFS-9097. Erasure coding: update EC command "-s" flag to "-p" when
-      specifying policy. (zhz)
-
-      HDFS-9086. Rename dfs.datanode.stripedread.threshold.millis to
-      dfs.datanode.stripedread.timeout.millis. (wang via zhz)
-
-      HDFS-8550. Erasure Coding: Fix FindBugs Multithreaded correctness Warning.
-      (Rakesh R via zhz)
-
-      HDFS-9113. ErasureCodingWorker#processErasureCodingTasks should not fail to process
-      remaining tasks due to one invalid ECTask (umamahesh)
-
-      HDFS-9091. Erasure Coding: Provide DistributedFilesystem API to
-      getAllErasureCodingPolicies. (Rakesh R via zhz)
-
-      HDFS-8920. Erasure Coding: when recovering lost blocks, logs can be too
-      verbose and hurt performance. (Rui Li via Kai Zheng)
-
-      HDFS-8882. Erasure Coding: Use datablocks, parityblocks and cell size from
-      ErasureCodingPolicy (Vinayakumar B via zhz)
-
-      HDFS-9040. Erasure coding: coordinate data streamers in
-      DFSStripedOutputStream. (jing9 and Walter Su)
-
-      HDFS-9185. Fix null tracer in ErasureCodingWorker. (Rakesh R via jing9)
-
-      HDFS-9180. Update excluded DataNodes in DFSStripedOutputStream based on failures
-      in data streamers. (jing9)
-
-      HDFS-8557. Allow to configure RS and XOR raw coders (Kai Zheng)
-
-      HDFS-9206. Inconsistent default value of dfs.datanode.stripedread.buffer.size.
-      (Walter Su via jing9)
-
-      HDFS-9209. Erasure coding: Add apache license header in
-      TestFileStatusWithECPolicy.java. (Surendra Singh Lilhore via jing9)
-
-      HDFS-8438. Erasure Coding: Allow concat striped files if they have the same
-      ErasureCodingPolicy. (Walter Su via jing9)
-
-      HDFS-9275. Wait previous ErasureCodingWork to finish before schedule
-      another one. (Walter Su via yliu)
-
-      HDFS-9348. Erasure Coding: DFS GetErasureCodingPolicy API on a non-existent 
-      file should be handled properly. (Rakesh R via umamahesh)
-
-      HDFS-9373. Erasure coding: friendly log information for write operations
-      with some failed streamers. (Li Bo via zhz)
-
-      HDFS-9173. Erasure Coding: Lease recovery for striped file. (Walter Su and
-      Jing Zhao via zhz)
-
-      HDFS-9451. Clean up depreated umasks and related unit tests.
-      (Wei-Chiu Chuang via wheat9)
-
-      HDFS-9575. Use byte array for internal block indices in a striped block.
-      (jing9 via szetszwo)
-
-      HDFS-9659. EditLogTailerThread to Active Namenode RPC should timeout
-      (surendra singh lilhore via vinayakumarb)
-
-      HDFS-9731. Erasure Coding: Rename BlockECRecoveryCommand to
-      BlockECReconstructionCommand. (Rakesh R via zhz)
-
-      HDFS-9403. Erasure coding: some EC tests are missing timeout.
-      (Gao Rui via zhz)
-
-      HDFS-9658. Erasure Coding: allow to use multiple EC policies in striping
-      related tests. (Rui Li via zhz)
-
-      HDFS-9775. Erasure Coding : Rename BlockRecoveryWork to
-      BlockReconstructionWork. (Rakesh R via zhz)
-
-      HDFS-9755. Erasure Coding: allow to use multiple EC policies in striping
-      related tests [Part 2]. (Rui Li via zhz)
-
-      HDFS-9787. SNNs stop uploading FSImage to ANN once isPrimaryCheckPointer
-      changed to false. (Guocui Mi via vinayakumarb)
-
-      HDFS-9830. Remove references to hftp in ViewFs documentation in trunk.
-      (Wei-Chiu Chuang via aajisaka)
-
-      HDFS-9816. Erasure Coding: allow to use multiple EC policies in striping
-      related tests [Part 3]. (Rui Li via zhz)
-
-Release 2.9.0 - UNRELEASED
-
-  INCOMPATIBLE CHANGES
-
-    HDFS-9047. Retire libwebhdfs. (wheat9)
-
-  NEW FEATURES
-    HDFS-9835. OIV: add ReverseXML processor which reconstructs an fsimage from
-    an XML file (cmccabe)
-
-  IMPROVEMENTS
-
-    HDFS-9267. TestDiskError should get stored replicas through
-    FsDatasetTestUtils. (Lei (Eddy) Xu via Colin P. McCabe)
-
-    HDFS-9491. Tests should get the number of pending async delets via
-    FsDatasetTestUtils. (Tony Wu via lei)
-
-    HDFS-9414. Refactor reconfiguration of ClientDatanodeProtocol for
-    reusability. (Xiaobing Zhou via Arpit Agarwal)
-
-    HDFS-8947. NameNode, DataNode and NFS gateway to support JvmPauseMonitor as
-    a service. (Sunil G via Stevel)
-
-    HDFS-9129. Move the safemode block count into BlockManager. (Mingliang Liu
-    via jing9)
-
-    HDFS-9281. Change TestDeleteBlockPool to not explicitly use File to check
-    block pool existence. (lei)
-
-    HDFS-9371. Code cleanup for DatanodeManager. (jing9)
-
-    HDFS-9300. TestDirectoryScanner.testThrottle() is still a little flakey.
-    (Daniel Templeton via wang)
-
-    HDFS-8477. describe dfs.ha.zkfc.port in hdfs-default.xml.
-    (Kanaka Kumar Avvaru via wang)
-
-    HDFS-9350. Avoid creating temprorary strings in Block.toString() and
-    getBlockName() (Staffan Friberg via cmccabe)
-
-    HDFS-9624. DataNode start slowly due to the initial DU command operations.
-    (Lin Yiqun via wang)
-
-    HDFS-9576: HTrace: collect position/length information on read operations
-    (zhz via cmccabe)
-
-    HDFS-9542. Move BlockIdManager from FSNamesystem to BlockManager. (jing9)
-
-    HDFS-9674. The HTrace span for OpWriteBlock should record the maxWriteToDisk
-    time. (cmccabe via zhz)
-
-    HDFS-9094. Add command line option to ask NameNode reload
-    configuration. (Xiaobing Zhou via Arpit Agarwal)
-
-    HDFS-9541. Add hdfsStreamBuilder API to libhdfs to support defaultBlockSizes
-    greater than 2 GB. (cmccabe via zhz)
-
-    HDFS-9677. Rename generationStampV1/generationStampV2 to
-    legacyGenerationStamp/generationStamp. (Mingliang Liu via jing9)
-
-    HDFS-7764. DirectoryScanner shouldn't abort the scan if one directory had
-    an error (Rakesh R via cmccabe)
-
-    HDFS-9637. Tests for RollingFileSystemSink. (Daniel Templeton via kasha)
-
-    HDFS-9780. RollingFileSystemSink doesn't work on secure clusters. 
-    (Daniel Templeton via kasha)
-
-    HDFS-9754. Avoid unnecessary getBlockCollection calls in BlockManager.
-    (jing9)
-
-    HDFS-7964. Add support for async edit logging. (Daryn Sharp)
-
-    HDFS-9534. Add CLI command to clear storage policy from a path.
-    (Xiaobing Zhou via Arpit Agarwal)
-
-  OPTIMIZATIONS
-
-  BUG FIXES
-
-    HDFS-9618. Fix mismatch between log level and guard in
-    BlockManager#computeRecoveryWorkForBlocks (iwasakims)
-
-    HDFS-9621. getListing wrongly associates Erasure Coding policy to pre-existing
-    replicated files under an EC directory. (jing9)
-
-    HDFS-9691. TestBlockManagerSafeMode#testCheckSafeMode fails intermittently.
-    (Mingliang Liu via aajisaka)
-
-    HDFS-9608. Disk IO imbalance in HDFS with heterogeneous storages.
-    (Wei Zhou via wang)
-
-    HDFS-9858. RollingFileSystemSink can throw an NPE on non-secure clusters. 
-    (Daniel Templeton via kasha)
-
-Release 2.8.0 - UNRELEASED
-
-  NEW FEATURES
-
-    HDFS-7891. A block placement policy with best rack failure tolerance.
-    (Walter Su via szetszwo)
-
-    HDFS-8131. Implement a space balanced block placement policy (Liu Shaohui
-    via kihwal)
-
-    HDFS-8155. Support OAuth2 in WebHDFS. (jghoman)
-
-    HDFS-9184. Logging HDFS operation's caller context into audit logs.
-    (Mingliang Liu via jitendra)
-
-    HDFS-9244. Support nested encryption zones. (zhz)
-
-    HDFS-9711. Integrate CSRF prevention filter in WebHDFS. (cnauroth)
-
-  IMPROVEMENTS
-
-    HDFS-9257. improve error message for "Absolute path required" in INode.java
-    to contain the rejected path (Marcell Szabo via harsh)
-
-    HDFS-2390. dfsadmin -setBalancerBandwidth does not validate -ve value
-    (Gautam Gopalakrishnan via harsh)
-
-    HDFS-8821. Explain message "Operation category X is not supported
-    in state standby" (Gautam Gopalakrishnan via harsh)
-
-    HDFS-3918. EditLogTailer shouldn't log WARN when other node
-    is in standby mode (todd via harsh)
-
-    HDFS-4396. Add START_MSG/SHUTDOWN_MSG for ZKFC
-    (Liang Xie via harsh)
-
-    HDFS-7875. Improve log message when wrong value configured for
-    dfs.datanode.failed.volumes.tolerated.
-    (nijel via harsh)
-
-    HDFS-2360. Ugly stacktrace when quota exceeds. (harsh)
-
-    HDFS-7835. make initial sleeptime in locateFollowingBlock configurable for
-    DFSClient. (Zhihai Xu via Yongjun Zhang)
-
-    HDFS-7829. Code clean up for LocatedBlock. (Takanobu Asanuma via jing9)
-
-    HDFS-7854. Separate class DataStreamer out of DFSOutputStream. (Li Bo via
-    jing9)
-
-    HDFS-7713. Implement mkdirs in the HDFS Web UI. (Ravi Prakash via wheat9)
-
-    HDFS-7928. Scanning blocks from disk during rolling upgrade startup takes
-    a lot of time if disks are busy (Rushabh S Shah via kihwal)
-
-    HDFS-7990. IBR delete ack should not be delayed. (daryn via kihwal)
-
-    HDFS-8004. Use KeyProviderCryptoExtension#warmUpEncryptedKeys when creating
-    an encryption zone. (awang via asuresh)
-
-    HDFS-6263. Remove DRFA.MaxBackupIndex config from log4j.properties.
-    (Abhiraj Butala via aajisaka)
-
-    HDFS-6408. Remove redundant definitions in log4j.properties.
-    (Abhiraj Butala via aajisaka)
-
-    HDFS-7890. Improve information on Top users for metrics in
-    RollingWindowsManager and lower log level (J.Andreina via vinayakumarb)
-
-    HDFS-7645. Rolling upgrade is restoring blocks from trash multiple times.
-    (Vinayakumar B and Keisuke Ogiwara via Arpit Agarwal)
-
-    HDFS-7944. Minor cleanup of BlockPoolManager#getAllNamenodeThreads.
-    (Arpit Agarwal)
-
-    HDFS-7671. hdfs user guide should point to the common rack awareness doc.
-    (Kai Sasaki via aajisaka)
-
-    HDFS-8009. Signal congestion on the DataNode. (wheat9)
-
-    HDFS-7978. Add LOG.isDebugEnabled() guard for some LOG.debug(..).
-    (Walter Su via wang)
-
-    HDFS-7888. Change DFSOutputStream and DataStreamer for convenience of
-    subclassing. (Li Bo via szetszwo)
-
-    HDFS-8049. Add @InterfaceAudience.Private annotation to hdfs client
-    implementation. (Takuya Fukudome via szetszwo)
-
-    HDFS-8079. Move dfs.client.retry.* confs from DFSConfigKeys to
-    HdfsClientConfigKeys.Retry.  (szetszwo)
-
-    HDFS-8073. Split BlockPlacementPolicyDefault.chooseTarget(..) so it
-    can be easily overrided. (Walter Su via vinayakumarb)
-
-    HDFS-8080. Separate JSON related routines used by WebHdfsFileSystem to a
-    package local class. (wheat9)
-
-    HDFS-8085. Move CorruptFileBlockIterator to a new hdfs.client.impl package.
-    (szetszwo)
-
-    HDFS-8076. Code cleanup for DFSInputStream: use offset instead of
-    LocatedBlock when possible. (Zhe Zhang via wang)
-
-    HDFS-8025. Addendum fix for HDFS-3087 Decomissioning on NN restart can
-    complete without blocks being replicated. (Ming Ma via wang)
-
-    HDFS-8089. Move o.a.h.hdfs.web.resources.* to the client jars. (wheat9)
-
-    HDFS-7979. Initialize block report IDs with a random number. (wang)
-
-    HDFS-8101. DFSClient use of non-constant DFSConfigKeys pulls in WebHDFS
-    classes at runtime. (Sean Busbey via atm)
-
-    HDFS-8102. Separate webhdfs retry configuration keys from DFSConfigKeys.
-    (wheat9)
-
-    HDFS-8100. Refactor DFSClient.Conf to a standalone class and separates
-    short-circuit related conf to ShortCircuitConf.  (szetszwo)
-
-    HDFS-8103. Move BlockTokenSecretManager.AccessMode into
-    BlockTokenIdentifier. (wheat9)
-
-    HDFS-8084. Move dfs.client.failover.* confs from DFSConfigKeys to
-    HdfsClientConfigKeys.Failover and fix typos in the dfs.http.client.*
-    configuration keys.  (szetszwo)
-
-    HDFS-7933. fsck should also report decommissioning replicas.
-    (Xiaoyu Yao via cnauroth)
-
-    HDFS-8083. Move dfs.client.write.* conf from DFSConfigKeys to 
-    HdfsClientConfigKeys.Write.  (szetszwo)
-
-    HDFS-8117. More accurate verification in SimulatedFSDataset: replace
-    DEFAULT_DATABYTE with patterned data. (Zhe Zhang via wang)
-
-    HDFS-8144. Split TestLazyPersistFiles into multiple tests. (Arpit Agarwal)
-
-    HDFS-8082. Move dfs.client.read.*, dfs.client.short.circuit.*,
-    dfs.client.mmap.* and dfs.client.hedged.read.* conf from DFSConfigKeys
-    to HdfsClientConfigKeys.  (szetszwo)
-
-    HDFS-8165. Move GRANDFATHER_GENERATION_STAMP and GRANDFATER_INODE_ID to
-    hdfs-client. (wheat9)
-
-    HDFS-8152. Refactoring of lazy persist storage cases. (Arpit Agarwal)
-
-    HDFS-8169. Move LocatedBlocks and related classes to hdfs-client. (wheat9)
-
-    HDFS-8133. Improve readability of deleted block check (Daryn Sharp via
-    Colin P. McCabe)
-
-    HDFS-8185. Separate client related routines in HAUtil into a new class.
-    (wheat9)
-
-    HDFS-8218. Move classes that used by ClientProtocol into hdfs-client.
-    (wheat9)
-
-    HDFS-4448. Allow HA NN to start in secure mode with wildcard address
-    configured (atm via asuresh)
-
-    HDFS-8215. Refactor NamenodeFsck#check method.  (Takanobu Asanuma
-    via szetszwo)
-
-    HDFS-8052. Move WebHdfsFileSystem into hadoop-hdfs-client. (wheat9)
-
-    HDFS-8176. Record from/to snapshots in audit log for snapshot diff report.
-    (J. Andreina via jing9)
-
-    HDFS-8280. Code Cleanup in DFSInputStream. (Jing Zhao via wheat9)
-
-    HDFS-8283. DataStreamer cleanup and some minor improvement. (szetszwo via
-    jing9)
-
-    HDFS-5574. Remove buffer copy in BlockReader.skip.
-    (Binglin Chang via aajisaka)
-
-    HDFS-8200. Refactor FSDirStatAndListingOp. (wheat9)
-
-    HDFS-8292. Move conditional in fmt_time from dfs-dust.js to status.html.
-    (Charles Lamb via wang)
-
-    HDFS-8086. Move LeaseRenewer to the hdfs.client.impl package.  (Takanobu
-    Asanuma via szetszwo)
-
-    HDFS-8249. Separate HdfsConstants into the client and the server side
-    class. (wheat9)
-
-    HDFS-7397. Add more detail to the documentation for the conf key
-    "dfs.client.read.shortcircuit.streams.cache.size" (Brahma Reddy Battula via
-    Colin P. McCabe)
-
-    HDFS-8237. Move all protocol classes used by ClientProtocol to hdfs-client.
-    (wheat9)
-
-    HDFS-7758. Retire FsDatasetSpi#getVolumes() and use
-    FsDatasetSpi#getVolumeRefs() instead (Lei (Eddy) Xu via Colin P. McCabe)
-
-    HDFS-7847. Modify NNThroughputBenchmark to be able to operate on a remote
-    NameNode (Charles Lamb via Colin P. McCabe)
-
-    HDFS-8314. Move HdfsServerConstants#IO_FILE_BUFFER_SIZE and
-    SMALL_BUFFER_SIZE to the users. (Li Lu via wheat9)
-
-    HDFS-8207. Improper log message when blockreport interval compared with
-    initial delay. (Brahma Reddy Battula and Ashish Singhi via ozawa)
-
-    HDFS-7559. Create unit test to automatically compare HDFS related classes
-    and hdfs-default.xml. (Ray Chiang via asuresh)
-
-    HDFS-5640. Add snapshot methods to FileContext. (Rakesh R via cnauroth)
-
-    HDFS-8284. Update documentation about how to use HTrace with HDFS (Masatake
-    Iwasaki via Colin P. McCabe)
-
-    HDFS-8113. Add check for null BlockCollection pointers in
-    BlockInfoContiguous structures (Chengbing Liu via Colin P. McCabe)
-
-    HDFS-6757. Simplify lease manager with INodeID. (wheat9)
-
-    HDFS-8327. Simplify quota calculations for snapshots and truncate. (wheat9)
-
-    HDFS-8357. Consolidate parameters of INode.CleanSubtree() into a parameter
-    objects. (Li Lu via wheat9)
-
-    HDFS-8255. Rename getBlockReplication to getPreferredBlockReplication.
-    (Contributed by Zhe Zhang)
-
-    HDFS-6184. Capture NN's thread dump when it fails over.
-    (Ming Ma via aajisaka)
-
-    HDFS-8350. Remove old webhdfs.xml and other outdated documentation stuff.
-    (Brahma Reddy Battula via aajisaka)
-
-    HDFS-6888. Allow selectively audit logging ops (Chen He via vinayakumarb)
-
-    HDFS-8397. Refactor the error handling code in DataStreamer.
-    (Tsz Wo Nicholas Sze via jing9)
-
-    HDFS-8394. Move getAdditionalBlock() and related functionalities into a
-    separate class. (wheat9)
-
-    HDFS-8157. Writes to RAM DISK reserve locked memory for block files.
-    (Arpit Agarwal)
-
-    HDFS-8345. Storage policy APIs must be exposed via the FileSystem
-    interface. (Arpit Agarwal)
-
-    HDFS-4185. Add a metric for number of active leases (Rakesh R via raviprak)
-
-    HDFS-4383. Document the lease limits. (Arshad Mohammad via aajisaka)
-
-    HDFS-8421. Move startFile() and related functions into FSDirWriteFileOp.
-    (wheat9)
-
-    HDFS-8377. Support HTTP/2 in datanode. (Duo Zhang via wheat9)
-
-    HDFS-8482. Rename BlockInfoContiguous to BlockInfo. (Zhe Zhang via wang)
-
-    HDFS-8443. Document dfs.namenode.service.handler.count in hdfs-site.xml.
-    (J.Andreina via aajisaka)
-
-    HDFS-8489. Subclass BlockInfo to represent contiguous blocks.
-    (Zhe Zhang via jing9)
-
-    HDFS-8386. Improve synchronization of 'streamer' reference in
-    DFSOutputStream. (Rakesh R via wang)
-
-    HDFS-8513. Rename BlockPlacementPolicyRackFaultTolarent to
-    BlockPlacementPolicyRackFaultTolerant. (wang)
-
-    HDFS-8532. Make the visibility of DFSOutputStream#streamer member variable
-    to private. (Rakesh R via wang)
-
-    HDFS-8535. Clarify that dfs usage in dfsadmin -report output includes all
-    block replicas. (Eddy Xu via wang)
-
-    HDFS-8432. Introduce a minimum compatible layout version to allow downgrade
-    in more rolling upgrade use cases. (cnauroth)
-
-    HDFS-8116. Cleanup uncessary if LOG.isDebugEnabled() from
-    RollingWindowManager. (Brahma Reddy Battula via xyao)
-
-    HDFS-8553. Document hdfs class path options.
-    (Brahma Reddy Battula via cnauroth)
-
-    HDFS-8552. Fix hdfs CLI usage message for namenode and zkfc.
-    (Brahma Reddy Battula via xyao)
-
-    HDFS-8568. TestClusterId#testFormatWithEmptyClusterIdOption is failing.
-    (Rakesh R. via xyao)
-
-    HDFS-8549. Abort the balancer if an upgrade is in progress. (wang)
-
-    HDFS-8573. Move creation of restartMeta file logic from BlockReceiver to
-    ReplicaInPipeline. (Eddy Xu via wang)
-
-    HDFS-7923. The DataNodes should rate-limit their full block reports by
-    asking the NN on heartbeat messages (cmccabe)
-
-    HDFS-8540.  Mover should exit with NO_MOVE_BLOCK if no block can be moved.
-    (surendra singh lilhore via szetszwo)
-
-    HDFS-8606. Cleanup DFSOutputStream by removing unwanted changes
-    from HDFS-8386. (Rakesh R via szetszwo)
-
-    HDFS-9608. Merge HDFS-7912 to trunk and branch-2 (track BlockInfo instead
-    of Block in UnderReplicatedBlocks and PendingReplicationBlocks).
-    (Zhe Zhang via wang)
-
-    HDFS-8238. Move ClientProtocol to the hdfs-client.
-    (Takanobu Asanuma via wheat9)
-
-    HDFS-8446. Separate safemode related operations in GetBlockLocations().
-    (wheat9)
-
-    HDFS-8589. Fix unused imports in BPServiceActor and BlockReportLeaseManager
-    (cmccabe)
-
-    HDFS-6249. Output AclEntry in PBImageXmlWriter.
-    (surendra singh lilhore via aajisaka)
-
-    HDFS-8605. Merge Refactor of DFSOutputStream from HDFS-7285 branch.
-    (vinayakumarb via wang)
-
-    HDFS-8582. Support getting a list of reconfigurable config properties and
-    do not generate spurious reconfig warnings (Lei (Eddy) Xu via Colin P.
-    McCabe)
-
-    HDFS-8192. Eviction should key off used locked memory instead of
-    ram disk free space. (Arpit Agarwal)
-
-    HDFS-6564. Use slf4j instead of common-logging in hdfs-client.
-    (Rakesh R via wheat9)
-
-    HDFS-8639. Add Option for NameNode HTTP port in MiniDFSClusterManager.
-    (Kai Sasaki via jing9)
-
-    HDFS-8462. Implement GETXATTRS and LISTXATTRS operations for WebImageViewer.
-    (Jagadesh Kiran N via aajisaka)
-
-    HDFS-8640. Make reserved RBW space visible through JMX. (kanaka kumar
-    avvaru via Arpit Agarwal)
-
-    HDFS-8665. Fix replication check in DFSTestUtils#waitForReplication. (wang)
-
-    HDFS-8546. Use try with resources in DataStorage and Storage. (wang)
-
-    HDFS-8651. Make hadoop-hdfs-project Native code -Wall-clean (Alan Burlison
-    via Colin P. McCabe)
-
-    HDFS-8653. Code cleanup for DatanodeManager, DatanodeDescriptor and
-    DatanodeStorageInfo. (Zhe Zhang via wang)
-
-    HDFS-8493. Consolidate truncate() related implementation in a single class.
-    (Rakesh R via wheat9)
-
-    HDFS-8635. Migrate HDFS native build to new CMake framework (Alan Burlison
-    via Colin P. McCabe)
-
-    HDFS-8666. Speedup the TestMover tests. (Walter Su via jing9)
-
-    HDFS-8703. Merge refactor of DFSInputStream from ErasureCoding branch
-    (vinayakumarb)
-
-    HDFS-8709. Clarify automatic sync in FSEditLog#logEdit. (wang)
-
-    HDFS-8711. setSpaceQuota command should print the available storage type
-    when input storage type is wrong. (Brahma Reddy Battula via xyao)
-
-    HDFS-8620. Clean up the checkstyle warinings about ClientProtocol.
-    (Takanobu Asanuma via wheat9)
-
-    HDFS-8712. Remove 'public' and 'abstracta modifiers in FsVolumeSpi and
-    FsDatasetSpi (Lei (Eddy) Xu via vinayakumarb)
-
-    HDFS-8726. Move protobuf files that define the client-sever protocols to
-    hdfs-client. (wheat9)
-
-    HDFS-8751. Remove setBlocks API from INodeFile and misc code cleanup. (Zhe
-    Zhang via jing9)
-
-    HDFS-8541. Mover should exit with NO_MOVE_PROGRESS if there is no move
-    progress.  (Surendra Singh Lilhore via szetszwo)
-
-    HDFS-8742. Inotify: Support event for OP_TRUNCATE.
-    (Surendra Singh Lilhore via aajisaka)
-
-    HDFS-8794. Improve CorruptReplicasMap#corruptReplicasMap. (yliu)
-
-    HDFS-7483. Display information per tier on the Namenode UI.
-    (Benoy Antony and wheat9 via wheat9)
-
-    HDFS-8721. Add a metric for number of encryption zones.
-    (Rakesh R via cnauroth)
-
-    HDFS-8495. Consolidate append() related implementation into a single class.
-    (Rakesh R via wheat9)
-
-    HDFS-8795. Improve InvalidateBlocks#node2blocks. (yliu)
-
-    HDFS-8797. WebHdfsFileSystem creates too many connections for pread. (jing9)
-
-    HDFS-8730. Clean up the import statements in ClientProtocol.
-    (Takanobu Asanuma via wheat9)
-
-    HDFS-8735. Inotify: All events classes should implement toString() API.
-    (Surendra Singh Lilhore via aajisaka)
-
-    HDFS-7858. Improve HA Namenode Failover detection on the client. (asuresh)
-
-    HDFS-8180. AbstractFileSystem Implementation for WebHdfs. (snayak via jghoman)
-
-    HDFS-8811. Move BlockStoragePolicy name's constants from
-    HdfsServerConstants.java to HdfsConstants.java (vinayakumarb)
-
-    HDFS-8822. Add SSD storagepolicy tests in TestBlockStoragePolicy#
-    testDefaultPolicies (vinayakumarb)
-
-    HDFS-8816. Improve visualization for the Datanode tab in the NN UI. (wheat9)
-
-    HDFS-7192. DN should ignore lazyPersist hint if the writer is
-    not local. (Arpit Agarwal)
-
-    HDFS-6860. BlockStateChange logs are too noisy. (Chang Li and xyao via xyao)
-
-    HDFS-8815. DFS getStoragePolicy implementation using single RPC call
-    (Surendra Singh Lilhore via vinayakumarb)
-
-    HDFS-8856. Make LeaseManager#countPath O(1). (Arpit Agarwal)
-
-    HDFS-8772. Fix TestStandbyIsHot#testDatanodeRestarts which occasionally fails.
-    (Walter Su via wang)
-
-    HDFS-8818. Changes the global moveExecutor to per datanode executors and
-    changes MAX_SIZE_TO_MOVE to be configurable.  (szetszwo)
-
-    HDFS-8805. Archival Storage: getStoragePolicy should not need superuser privilege.
-    (Brahma Reddy Battula via jing9)
-
-    HDFS-8887. Expose storage type and storage ID in BlockLocation. (wang)
-
-    HDFS-8622. Implement GETCONTENTSUMMARY operation for WebImageViewer.
-    (Jagadesh Kiran N via aajisaka)
-
-    HDFS-7649. Multihoming docs should emphasize using hostnames in
-    configurations. (Brahma Reddy Battula via Arpit Agarwal)
-
-    HDFS-8824. Do not use small blocks for balancing the cluster.  (szetszwo)
-
-    HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length.
-    (Anu Engineer via xyao)
-
-    HDFS-8713. Convert DatanodeDescriptor to use SLF4J logging. (wang)
-
-    HDFS-6407. Add sorting and pagination in the datanode tab of the NN Web UI.
-    (wheat9)
-
-    HDFS-8801. Convert BlockInfoUnderConstruction as a feature.
-    (Jing Zhao via wheat9)
-
-    HDFS-8880. NameNode metrics logging. (Arpit Agarwal)
-
-    HDFS-8278. When computing max-size-to-move in Balancer, count only the
-    storage with remaining >= default block size.  (szetszwo)
-
-    HDFS-8435. Support CreateFlag in WebHDFS. (Jakob Homan via cdouglas)
-
-    HDFS-8826. In Balancer, add an option to specify the source node list
-    so that balancer only selects blocks to move from those nodes.  (szetszwo)
-
-    HDFS-8911. NameNode Metric : Add Editlog counters as a JMX metric.
-    (Anu Engineer via Arpit Agarwal)
-
-    HDFS-8803. Move DfsClientConf to hdfs-client. (Mingliang Liu via wheat9)
-
-    HDFS-8917. Cleanup BlockInfoUnderConstruction from comments and tests.
-    (Zhe Zhang via jing9)
-
-    HDFS-8884. Fail-fast check in BlockPlacementPolicyDefault#chooseTarget.
-    (yliu)
-
-    HDFS-8828. Utilize Snapshot diff report to build diff copy list in distcp.
-    (Yufei Gu via Yongjun Zhang)
-
-    HDFS-8823. Move replication factor into individual blocks. (wheat9)
-
-    HDFS-8934. Move ShortCircuitShm to hdfs-client. (Mingliang Liu via wheat9)
-
-    HDFS-8928. Improvements for BlockUnderConstructionFeature:
-    ReplicaUnderConstruction as a separate class and replicas as an array.
-    (jing9)
-
-    HDFS-8900. Compact XAttrs to optimize memory footprint. (yliu)
-
-    HDFS-8951. Move the shortcircuit package to hdfs-client.
-    (Mingliang Liu via wheat9)
-
-    HDFS-8896. DataNode object isn't GCed when shutdown, because it has GC
-    root in ShutdownHookManager. (Walter Su via jing9)
-
-    HDFS-8248. Store INodeId instead of the INodeFile object in
-    BlockInfoContiguous. (wheat9)
-
-    HDFS-8962. Clean up checkstyle warnings in o.a.h.hdfs.DfsClientConf.
-    (Mingliang Liu via wheat9)
-
-    HDFS-8865. Improve quota initialization performance. (kihwal)
-
-    HDFS-8938. Extract BlockToMarkCorrupt and ReplicationWork as standalone
-    classes from BlockManager. (Mingliang Liu via wheat9)
-
-    HDFS-8925. Move BlockReaderLocal to hdfs-client.
-    (Mingliang Liu via wheat9)
-
-    HDFS-8983. NameNode support for protected directories. (Arpit Agarwal)
-
-    HDFS-8980. Remove unnecessary block replacement in INodeFile. (jing9)
-
-    HDFS-8990. Move RemoteBlockReader to hdfs-client module.
-    (Mingliang via wheat9)
-
-    HDFS-8946. Improve choosing datanode storage for block placement. (yliu)
-
-    HDFS-8965. Harden edit log reading code against out of memory errors (cmccabe)
-
-    HDFS-2070. Add more unit tests for FsShell getmerge (Daniel Templeton via
-    Colin P. McCabe)
-
-    HDFS-328. Improve fs -setrep error message for invalid replication factors.
-    (Daniel Templeton via wang)
-
-    HDFS-8890. Allow admin to specify which blockpools the balancer should run
-    on. (Chris Trezzo via mingma)
-
-    HDFS-9002. Move o.a.h.hdfs.net/*Peer classes to hdfs-client.
-    (Mingliang Liu via wheat9)
-
-    HDFS-9021. Use a yellow elephant rather than a blue one in diagram. (wang)
-
-    HDFS-9012. Move o.a.h.hdfs.protocol.datatransfer.PipelineAck class to
-    hadoop-hdfs-client module. (Mingliang Liu via wheat9)
-
-    HDFS-8984. Move replication queues related methods in FSNamesystem to
-    BlockManager. (wheat9)
-
-    HDFS-9019. Adding informative message to sticky bit permission denied
-    exception. (xyao)
-
-    HDFS-8860. Remove unused Replica copyOnWrite code (Lei (Eddy) Xu via Colin P. McCabe)
-
-    HDFS-8716. Introduce a new config specifically for safe mode block count
-    (Chang Li via kihwal)
-
-    HDFS-7116. Add a command to get the balancer bandwidth
-    (Rakesh R via vinayakumarb)
-
-    HDFS-8974. Convert docs in xdoc format to markdown.
-    (Masatake Iwasaki via aajisaka)
-
-    HDFS-6763. Initialize file system-wide quota once on transitioning to active
-    (kihwal)
-
-    HDFS-9027. Refactor o.a.h.hdfs.DataStreamer#isLazyPersist() method.
-    (Mingliang Liu via Arpit Agarwal)
-
-    HDFS-8996. Consolidate validateLog and scanLog in FJM#EditLogFile (Zhe
-    Zhang via Colin P. McCabe)
-
-    HDFS-9010. Replace NameNode.DEFAULT_PORT with HdfsClientConfigKeys.
-    DFS_NAMENODE_RPC_PORT_DEFAULT config key. (Mingliang Liu via wheat9)
-
-    HDFS-9065. Include commas on # of files, blocks, total filesystem objects
-    in NN Web UI. (Daniel Templeton via wheat9)
-
-    HDFS-9008. Balancer#Parameters class could use a builder pattern.
-    (Chris Trezzo via mingma)
-
-    HDFS-8953. DataNode Metrics logging (Kanaka Kumar Avvaru via vinayakumarb)
-
-    HDFS-9082. Change the log level in WebHdfsFileSystem.initialize() from INFO
-    to DEBUG. (Santhosh Nayak via cnauroth)
-
-    HDFS-7986. Allow files / directories to be deleted from the NameNode UI.
-    (Ravi Prakash via wheat9)
-
-    HDFS-7995. Implement chmod in the HDFS Web UI.
-    (Ravi Prakash and Haohui Mai via wheat9)
-
-    HDFS-9022. Move NameNode.getAddress() and NameNode.getUri() to
-    hadoop-hdfs-client. (Mingliang Liu via wheat9)
-
-    HDFS-5802. NameNode does not check for inode type before traversing down a
-    path. (Xiao Chen via Yongjun Zhang)
-
-    HDFS-9101. Remove deprecated NameNode.getUri() static helper method.
-    (Mingliang Liu via wheat9)
-
-    HDFS-9111. Move hdfs-client protobuf convert methods from PBHelper to
-    PBHelperClient. (Mingliang Liu via wheat9)
-
-    HADOOP-12428. Fix inconsistency between log-level guards and statements.
-    (Jagadesh Kiran N and Jackie Chang via ozawa)
-
-    HDFS-9039. Separate client and server side methods of o.a.h.hdfs.
-    NameNodeProxies. (Mingliang Liu via wheat9)
-
-    HDFS-8733. Keep server related definition in hdfs.proto on server side.
-    (Mingliang Liu via wheat9)
-
-    HDFS-9130. Use GenericTestUtils#setLogLevel to the logging level.
-    (Mingliang Liu via wheat9)
-
-    HDFS-9131 Move config keys used by hdfs-client to HdfsClientConfigKeys.
-    (Mingliang Liu via wheat9)
-  
-    HDFS-7529. Consolidate encryption zone related implementation into a single
-    class. (Rakesh R via wheat9)
-
-    HDFS-9134. Move LEASE_{SOFTLIMIT,HARDLIMIT}_PERIOD constants from
-    HdfsServerConstants to HdfsConstants. (Mingliang Liu via wheat9)
-
-    HDFS-5795. RemoteBlockReader2#checkSuccess() shoud print error status.
-    (Xiao Chen via Yongjun Zhang)
-
-    HDFS-9112. Improve error message for Haadmin when multiple name service IDs
-    are configured. (Anu Engineer via jing9)
-
-    HDFS-9132. Pass genstamp to ReplicaAccessorBuilder. (Colin Patrick McCabe via
-    Lei (Eddy) Xu)
-
-    HDFS-9133. ExternalBlockReader and ReplicaAccessor need to return -1 on read
-    when at EOF. (Colin Patrick McCabe via Lei (Eddy) Xu)
-
-    HDFS-8873. Allow the directoryScanner to be rate-limited (Daniel Templeton
-    via Colin P. McCabe)
-
-    HDFS-8053. Move DFSIn/OutputStream and related classes to
-    hadoop-hdfs-client. (Mingliang Liu via wheat9)
-
-    HDFS-9087. Add some jitter to DataNode.checkDiskErrorThread (Elliott Clark
-    via Colin P. McCabe) 
-
-    HDFS-8740. Move DistributedFileSystem to hadoop-hdfs-client. (Mingliang Liu
-    via wheat9)
-
-    HDFS-9080. Update htrace version to 4.0.1 (cmccabe)
-
-    HDFS-9148. Incorrect assert message in TestWriteToReplica#testWriteToTemporary
-    (Tony Wu via lei)
-
-    HDFS-8859. Improve DataNode ReplicaMap memory footprint to save about 45%.
-    (yliu)
-
-    HDFS-9165. Move entries in META-INF/services/o.a.h.fs.FileSystem to
-    hdfs-client. (Mingliang Liu via wheat9)
-
-    HDFS-8696. Make the lower and higher watermark in the DN Netty server
-    configurable. (Xiaobing Zhou via wheat9)
-
-    HDFS-8971. Remove guards when calling LOG.debug() and LOG.trace() in client
-    package. (Mingliang Liu via wheat9)
-
-    HDFS-9175. Change scope of 'AccessTokenProvider.getAccessToken()' and
-    'CredentialBasedAccessTokenProvider.getCredential()' abstract methods to
-    public (Santhosh Nayak via cnauroth)
-
-    HDFS-9015. Refactor TestReplicationPolicy to test different block placement
-    policies. (Ming Ma via lei)
-
-    HDFS-8979. Clean up checkstyle warnings in hadoop-hdfs-client module.
-    (Mingliang Liu via wheat9)
-
-    HDFS-9155. OEV should treat .XML files as XML even when the file name
-    extension is uppercase (nijel via cmccabe)
-
-    HDFS-9170. Move libhdfs / fuse-dfs / libwebhdfs to hdfs-client. (wheat9)
-
-    HDFS-8164. cTime is 0 in VERSION file for newly formatted NameNode.
-    (Xiao Chen via Yongjun Zhang)
-
-    HDFS-9181. Better handling of exceptions thrown during upgrade shutdown.
-    (Wei-Chiu Chuang via Yongjun Zhang)
-
-    HDFS-9110. Use Files.walkFileTree in NNUpgradeUtil#doPreUpgrade for
-    better efficiency. (Charlie Helin via wang)
-
-    HDFS-8988. Use LightWeightHashSet instead of LightWeightLinkedSet in
-    BlockManager#excessReplicateMap. (yliu)
-
-    HDFS-9006. Provide BlockPlacementPolicy that supports upgrade domain.
-    (Ming Ma via lei)
-
-    HDFS-1172. Blocks in newly completed files are considered under-replicated
-    too quickly. (Masatake Iwasaki via jing9)
-
-    HDFS-9238. Update TestFileCreation.testLeaseExpireHardLimit() to avoid using
-    DataNodeTestUtils.getFile(). (Tony Wu via lei)
-
-    HDFS-9223. Code cleanup for DatanodeDescriptor and HeartbeatManager. (jing9)
-
-    HDFS-9188. Make block corruption related tests FsDataset-agnostic. (lei)
-
-    HDFS-9205. Do not schedule corrupt blocks for replication.  (szetszwo)
-
-    HDFS-9250. Add Precondition check to LocatedBlock#addCachedLoc.
-    (Xiao Chen via wang)
-
-    HDFS-9251. Refactor TestWriteToReplica and TestFsDatasetImpl to avoid
-    explicitly creating Files in the tests code. (lei)
-
-    HDFS-8647. Abstract BlockManager's rack policy into BlockPlacementPolicy.
-    (Brahma Reddy Battula via mingma)
-
-    HDFS-9225. Fix intermittent test failure of
-    TestBlockManager.testBlocksAreNotUnderreplicatedInSingleRack.
-    (Masatake Iwasaki via wang)
-
-    HDFS-7087. Ability to list /.reserved. (Xiao Chen via wang)
-
-    HDFS-9264. Minor cleanup of operations on FsVolumeList#volumes.
-    (Walter Su via lei)
-
-    HDFS-8808. dfs.image.transfer.bandwidthPerSec should not apply to
-    -bootstrapStandby (zhz)
-
-    HDFS-4015. Safemode should count and report orphaned blocks.
-    (Anu Engineer via Arpit Agarwal)
-
-    HDFS-7284. Add more debug info to
-    BlockInfoUnderConstruction#setGenerationStampAndVerifyReplicas.
-    (Wei-Chiu Chuang via Yongjun Zhang)
-
-    HDFS-9284. fsck command should not print exception trace when file not
-    found. (Jagadesh Kiran N via wang)
-
-    HDFS-9291. Fix TestInterDatanodeProtocol to be FsDataset-agnostic. (lei)
-
-    HDFS-8945. Update the description about replica placement in HDFS
-    Architecture documentation. (Masatake Iwasaki via wang)
-
-    HDFS-9292. Make TestFileConcorruption independent to underlying FsDataset
-    Implementation. (lei)
-
-    HDFS-9259. Make SO_SNDBUF size configurable at DFSClient side for hdfs
-    write scenario. (Mingliang Liu via mingma)
-
-    HDFS-9299. Give ReplicationMonitor a readable thread name (Staffan Friberg
-    via Colin P. McCabe)
-
-    HDFS-9307. fuseConnect should be private to fuse_connect.c (Mingliang Liu
-    via Colin P. McCabe)
-
-    HDFS-9311. Support optional offload of NameNode HA service health checks to
-    a separate RPC server. (cnauroth)
-
-    HDFS-9255. Consolidate block recovery related implementation into a single
-    class. (Walter Su via zhz)
-
-    HDFS-9295. Add a thorough test of the full KMS code path. 
-    (Daniel Templeton via zhz)
-
-    HDFS-8545. Refactor FS#getUsed() to use ContentSummary and add an API to fetch
-    the total file length from a specific path (J.Andreina via vinayakumarb)
-
-    HDFS-9229. Expose size of NameNode directory as a metric.
-    (Surendra Singh Lilhore via zhz)
-
-    HDFS-9339. Extend full test of KMS ACLs. (Daniel Templeton via zhz)
-
-    HDFS-9007. Fix HDFS Balancer to honor upgrade domain policy. (Ming Ma via lei)
-
-    HDFS-9331. Modify TestNameNodeMXBean#testNameNodeMXBeanInfo() to account for
-    filesystem entirely allocated for DFS use. (Tony Wu via lei)
-
-    HDFS-9363. Add fetchReplica() to FsDatasetTestUtils to return FsDataset-agnostic
-    replica. (Tony Wu via lei)
-
-    HDFS-9377. Fix findbugs warnings in FSDirSnapshotOp.
-    (Mingliang Liu via Yongjun Zhang)
-
-    HDFS-9236. Missing sanity check for block size during block recovery.
-    (Tony Wu via Yongjun Zhang)
-
-    HDFS-9379. Make NNThroughputBenchmark$BlockReportStats support more than 10
-    datanodes. (Mingliang Liu via Arpit Agarwal)
-
-    HDFS-9398. Make ByteArraryManager log message in one-line format.
-    (Mingliang Liu via szetszwo)
-
-    HDFS-2261. AOP unit tests are not getting compiled or run. (wheat9)
-
-    HDFS-9369. Use ctest to run tests for hadoop-hdfs-native-client. (wheat9)
-
-    HDFS-9252. Change TestFileTruncate to use FsDatasetTestUtils to get block
-    file size and genstamp. (Lei (Eddy) Xu via cmccabe)
-
-    HDFS-8056. Decommissioned dead nodes should continue to be counted as dead
-    after NN restart. (mingma)
-
-    HDFS-9439. Include status of closeAck into exception message in DataNode#run.
-    (Xiao Chen via Yongjun Zhang)
-
-    HDFS-9402. Switch DataNode.LOG to use slf4j. (Walter Su via wheat9)
-
-    HDFS-9153. Pretty-format the output for DFSIO. (Kai Zheng via wheat9)
-
-    HDFS-7988. Replace usage of ExactSizeInputStream with LimitInputStream.
-    (Walter Su via wheat9)
-
-    HDFS-9314. Improve BlockPlacementPolicyDefault's picking of excess
-    replicas. (Xiao Chen via mingma)
-
-    HDFS-8807.  dfs.datanode.data.dir does not handle spaces between
-    storageType and URI correctly.  (Anu Engineer via szetszwo)
-
-    HDFS-9438. TestPipelinesFailover assumes Linux ifconfig.
-    (John Zhuge via Yongjun Zhang)
-
-    HDFS-8512. WebHDFS : GETFILESTATUS should return LocatedBlock with storage
-    type info. (xyao)
-
-    HDFS-9269. Update the documentation and wrapper for fuse-dfs. 
-    (Wei-Chiu Chuang via zhz)
-
-    HDFS-9485. Make BlockManager#removeFromExcessReplicateMap accept BlockInfo
-    instead of Block. (Mingliang Liu via jing9)
-
-    HDFS-9490. MiniDFSCluster should change block generation stamp via
-    FsDatasetTestUtils. (Tony Wu via lei)
-
-    HDFS-9474. TestPipelinesFailover should not fail when printing debug
-    message. (John Zhuge via Yongjun Zhang)
-
-    HDFS-9214. Support reconfiguring dfs.datanode.balance.max.concurrent.moves
-    without DN restart. (Xiaobing Zhou via Arpit Agarwal)
-
-    HDFS-9527. The return type of FSNamesystem.getBlockCollection should be
-    changed to INodeFile. (szetszwo)
-
-    HDFS-9472. concat() API does not give proper exception messages on ./reserved 
-    relative path (Rakesh R via umamahesh)
-
-    HDFS-9528. Cleanup namenode audit/log/exception messages. (szetszwo via umamahesh)
-
-    HDFS-9532. Detailed exception info is lost in reportTo methods of
-    ErrorReportAction and ReportBadBlockAction. (Yongjun Zhang)
-
-    HDFS-9519. Some coding improvement in SecondaryNameNode#main.
-    (Xiao Chen via Yongjun Zhang)
-
-    HDFS-9514. TestDistributedFileSystem.testDFSClientPeerWriteTimeout failing;
-    exception being swallowed. (Wei-Chiu Chuang via Yongjun Zhang)
-
-    HDFS-9535. Newly completed blocks in IBR should not be considered
-    under-replicated too quickly. (Mingliang Liu via jing9)
-
-    HDFS-8894. Set SO_KEEPALIVE on DN server sockets.
-    (Kanaka Kumar Avvaru via wang)
-
-    HDFS-9557. Reduce object allocation in PB conversion
-    (Daryn Sharp via cnauroth)
-
-    HDFS-9552. Document types of permission checks performed for HDFS
-    operations. (cnauroth)
-
-    HDFS-7779. Support changing ownership, group and replication in HDFS Web
-    UI. (Ravi Prakash via wheat9)
-
-    HDFS-9498. Move code that tracks blocks with future generation stamps
-    to BlockManagerSafeMode. (Mingliang Liu via Arpit Agarwal)
-
-    HDFS-9626. TestBlockReplacement#testBlockReplacement fails occasionally.
-    (Xiao Chen via zhz)
-
-    HDFS-9630. DistCp minor refactoring and clean up. (Kai Zheng via zhz)
-
-    HDFS-9415. Document dfs.cluster.administrators and
-    dfs.permissions.superusergroup. (Xiaobing Zhou via Arpit Agarwal)
-
-    HDFS-9655. NN should start JVM pause monitor before loading fsimage.
-    (John Zhuge via Lei (Eddy) Xu)
-
-    HDFS-8898. Create API and command-line argument to get quota and quota
-    usage without detailed content summary. (Ming Ma via kihwal)
-
-    HDFS-9706. Log more details in debug logs in BlockReceiver's constructor.
-    (Xiao Chen via Yongjun Zhang)
-
-    HDFS-9638. Improve DistCp Help and documentation.
-    (Wei-Chiu Chuang via Yongjun Zhang)
-
-    HDFS-9721. Allow Delimited PB OIV tool to run upon fsimage that contains
-    INodeReference. (Xiao Chen via lei)
-
-    HDFS-9503. Use generic option -fs for NNThroughputBenchmark instead of
-    -namenode. (Mingliang Liu via shv)
-
-    HDFS-9777. Fix typos in DFSAdmin command line and documentation.
-    (Wei-Chiu Chuang via umamahesh)
-
-    HDFS-9700. DFSClient and DFSOutputStream should set TCP_NODELAY on sockets
-    for DataTransferProtocol (Gary Helmling via iwasakims)
-
-    HDFS-9644. Update encryption documentation to reflect nested EZs. (zhz)
-
-    HDFS-9797. Log Standby exceptions thrown by RequestHedgingProxyProvider
-    at DEBUG Level (Inigo Goiri via asuresh)
-
-    HDFS-9773. Remove dead code related to SimulatedFSDataset in tests.
-    (Brahma Reddy Battula via aajisaka)
-
-    HDFS-8923. Add -source flag to balancer usage message.  (Chris Trezzo
-    via szetszwo)
-
-    HDFS-9764. DistCp doesn't print value for several arguments including
-    -numListstatusThreads. (Wei-Chiu Chuang via Yongjun Zhang) 
-
-    HDFS-9084. Pagination, sorting and filtering of files/directories in the
-    HDFS Web UI. (Ravi Prakash via ozawa)
-
-    HDFS-9844. Correct path creation in getTrashRoot to handle root dir. (zhz)
-
-    HDFS-9854. Log cipher suite negotiation more verbosely
-    (Wei-Chiu Chuang via cnauroth)
-
-    HDFS-9843. Document distcp options required for copying between encrypted
-    locations. (Xiaoyu Yao via cnauroth)
-
-    HDFS-9831. Document webhdfs retry configuration keys introduced by
-    HDFS-5219/HDFS-5122. (Xiaobing Zhou via xyao)
-
-    HDFS-9887. WebHdfs socket timeouts should be configurable.
-    (Austin Donnelly and Chris Douglas via xyao)
-
-  OPTIMIZATIONS
-
-    HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than
-    DFSOutputStream#writeChunk (cmccabe)
-
-    HDFS-7433. Optimize performance of DatanodeManager's node map.
-    (daryn via kihwal)
-
-    HDFS-8792. BlockManager#postponedMisreplicatedBlocks should use a
-    LightWeightHashSet to save memory (Yi Liu via Colin P. McCabe)
-
-    HDFS-8845. DiskChecker should not traverse the entire tree (Chang Li via
-    Colin P. McCabe)
-
-    HDFS-8862. BlockManager#excessReplicateMap should use a HashMap. (yliu)
-
-    HDFS-8929. Add a metric to expose the timestamp of the last journal
-    (surendra singh lilhore via vinayakumarb)
-
-    HDFS-8829. Make SO_RCVBUF and SO_SNDBUF size configurable for
-    DataTransferProtocol sockets and allow configuring auto-tuning (He Tianyi
-    via Colin P. McCabe)
-
-    HDFS-9139. Enable parallel JUnit tests for HDFS Pre-commit
-    (Chris Nauroth and Vinayakumar B via vinayakumarb)
-
-    HDFS-9145. Tracking methods that hold FSNamesytemLock for too long.
-    (Mingliang Liu via wheat9)
-
-    HDFS-9167. Update pom.xml in other modules to depend on hdfs-client instead
-    of hdfs. (Mingliang Liu via wheat9)
-
-    HDFS-9253. Refactor tests of libhdfs into a directory. (wheat9)
-
-    HDFS-9280. Document NFS gateway export point parameter. (Xiao Chen via zhz)
-
-    HDFS-9297. Update TestBlockMissingException to use corruptBlockOnDataNodesByDeletingBlockFile().
-    (Tony Wu via lei)
-
-    HDFS-9168. Move client side unit test to hadoop-hdfs-client. (wheat9)
-
-    HDFS-9312. Fix TestReplication to be FsDataset-agnostic. (lei)
-
-    HDFS-9308. Add truncateMeta() and deleteMeta() to MiniDFSCluster. (Tony Wu via lei)
-
-    HDFS-9372. Remove dead code in DataStorage.recoverTransitionRead.
-    (Duo Zhang via wheat9)
-
-    HDFS-9282. Make data directory count and storage raw capacity related tests
-    FsDataset-agnostic. (Tony Wu via lei)
-
-    HDFS-9318. considerLoad factor can be improved. (Kuhu Shukla via kihwal)
-
-    HDFS-8335. FSNamesystem should construct FSPermissionChecker only if
-    permission is enabled. (Gabor Liptak via wheat9)
-
-    HDFS-9436. Make NNThroughputBenchmark$BlockReportStats run with 10
-    datanodes by default. (Mingliang Liu via shv)
-
-    HDFS-8999. Allow a file to be closed with COMMITTED but not yet COMPLETE
-    blocks.  (szetszwo)
-
-    HDFS-9715. Check storage ID uniqueness on datanode startup
-    (Lei (Eddy) Xu via vinayakumarb)
-
-    HDFS-9726. Refactor IBR code to a new class.  (szetszwo)
-
-    HDFS-9686. Remove useless boxing/unboxing code.
-    (Kousuke Saruta via aajisaka)
-
-    HDFS-9768. Reuse ObjectMapper instance in HDFS to improve the performance.
-    (Lin Yiqun via aajisaka)
-
-    HDFS-9425. Expose number of blocks per volume as a metric
-    (Brahma Reddy Battula via vinayakumarb)
-
-    HDFS-9710. DN can be configured to send block receipt IBRs in batches.
-    (szetszwo)
-
-  BUG FIXES
-
-    HDFS-7501. TransactionsSinceLastCheckpoint can be negative on SBNs.
-    (Gautam Gopalakrishnan via harsh)
-
-    HDFS-5356. MiniDFSCluster should close all open FileSystems when shutdown()
-    (Rakesh R via vinayakumarb)
-
-    HDFS-7867. Update action param from "start" to "prepare" in rolling upgrade
-    javadoc (J.Andreina via vinayakumarb)
-
-    HDFS-3325. When configuring "dfs.namenode.safemode.threshold-pct" to a value
-    greater or equal to 1 there is mismatch in the UI report
-    (J.Andreina via vinayakumarb)
-
-    HDFS-8002. Website refers to /trash directory. (Brahma Reddy Battula via
-    aajisaka)
-
-    HDFS-7261. storageMap is accessed without synchronization in
-    DatanodeDescriptor#updateHeartbeatState() (Brahma Reddy Battula via Colin
-    P. McCabe)
-
-    HDFS-7997. The first non-existing xattr should also throw IOException.
-    (zhouyingchao via yliu)
-
-    HDFS-7922. ShortCircuitCache#close is not releasing
-    ScheduledThreadPoolExecutors (Rakesh R via Colin P. McCabe)
-
-    HDFS-5215. dfs.datanode.du.reserved is not considered while computing
-    available space ( Brahma Reddy Battula via Yongjun Zhang)
-
-    HDFS-7725. Incorrect "nodes in service" metrics caused all writes to fail.
-    (Ming Ma via wang)
-
-    HDFS-8096. DatanodeMetrics#blocksReplicated will get incremented early and
-    even for failed transfers (vinayakumarb)
-
-    HDFS-7939. Two fsimage_rollback_* files are created which are not deleted
-    after rollback. (J.Andreina via vinayakumarb)
-
-    HDFS-8111. NPE thrown when invalid FSImage filename given for
-    'hdfs oiv_legacy' cmd ( surendra singh lilhore via vinayakumarb )
-
-    HDFS-7701. Support reporting per storage type quota and usage
-    with hadoop/hdfs shell. (Peter Shi via Arpit Agarwal)
-
-    HDFS-6666. Abort NameNode and DataNode startup if security is enabled but
-    block access token is not enabled. (Vijay Bhat via cnauroth)
-
-    HDFS-8055. NullPointerException when topology script is missing.
-    (Anu Engineer via cnauroth)
-
-    HDFS-8142. DistributedFileSystem encryption zone commands should resolve
-    relative paths. (Rakesh R via wang)
-
-    HDFS-7863. Missing description of some methods and parameters in javadoc of
-    FSDirDeleteOp. (Brahma Reddy Battula via ozawa)
-
-    HDFS-8043. NPE in MiniDFSCluster teardown. (Brahma Reddy Battula via ozawa)
-
-    HDFS-8173. NPE thrown at DataNode shutdown when HTTP server was not able to
-    create (surendra singh lilhore via vinayakumarb)
-
-    HDFS-7993. Provide each Replica details in fsck (J.Andreina via vinayakumarb)
-
-    HDFS-8217. During block recovery for truncate Log new Block Id in case of
-    copy-on-truncate is true. (vinayakumarb)
-
-    HDFS-8231. StackTrace displayed at client while QuotaByStorageType exceeds
-    (J.Andreina and Xiaoyu Yao via vinayakumarb)
-
-    HDFS-8191. Fix byte to integer casting in SimulatedFSDataset#simulatedByte.
-    (Zhe Zhang via wang)
-
-    HDFS-8211. DataNode UUID is always null in the JMX counter. (Anu Engineer
-    via Arpit Agarwal)
-
-    HDFS-8247. TestDiskspaceQuotaUpdate#testAppendOverTypeQuota is failing.
-    (Xiaoyu Yao via cnauroth)
-
-    HDFS-8206. Fix the typos in hadoop-hdfs-httpfs. (Brahma Reddy Battula via xyao)
-
-    HDFS-8205. CommandFormat#parse() should not parse option as
-    value of option. (Peter Shi and Xiaoyu Yao via Arpit Agarwal)
-
-    HDFS-8232. Missing datanode counters when using Metrics2 sink interface.
-    (Anu Engineer via cnauroth)
-
-    HDFS-8214. Secondary NN Web UI shows wrong date for Last Checkpoint. (clamb via wang)
-
-    HDFS-8300. Fix unit test failures and findbugs warning caused by HDFS-8283.
-    (jing9)
-
-    HDFS-8276. LazyPersistFileScrubber should be disabled if scrubber interval
-    configured zero. (Surendra Singh Lilhore via Arpit Agarwal)
-
-    HDFS-8229. LAZY_PERSIST file gets deleted after NameNode restart.
-    (Surendra Singh Lilhore via Arpit Agarwal)
-
-    HDFS-8309. Skip unit test using DataNodeTestUtils#injectDataDirFailure() on Windows.
-    (xyao)
-
-    HDFS-8290. WebHDFS calls before namesystem initialization can cause
-    NullPointerException. (cnauroth)
-
-    HDFS-8310. Fix TestCLI.testAll "help: help for find" on Windows.
-    (Kiran Kumar M R via Xiaoyu Yao)
-
-    HDFS-2484. checkLease should throw FileNotFoundException when file does
-    not exist. (Rakesh R via shv)
-
-    HDFS-7833. DataNode reconfiguration does not recalculate valid volumes
-    required, based on configured failed volumes tolerated.
-    (Lei (Eddy) Xu via cnauroth)
-
-    HDFS-8325. Misspelling of threshold in log4j.properties for tests.
-    (Brahma Reddy Battula via aajisaka)
-
-    HDFS-8321. CacheDirectives and CachePool operations should throw
-    RetriableException in safemode. (wheat9)
-
-    HDFS-8037. CheckAccess in WebHDFS silently accepts malformed FsActions
-    parameters. (wheat9)
-
-    HDFS-8257. Namenode rollingUpgrade option is incorrect in document
-    (J.Andreina via vinayakumarb)
-
-    HDFS-8067. haadmin prints out stale help messages (Ajith S via vinayakumarb)
-
-    HDFS-8174. Update replication count to live rep count in fsck report. (J.Andreina)
-
-    HDFS-6291. FSImage may be left unclosed in BootstrapStandby#doRun()
-    (Sanghyun Yun via vinayakumarb)
-
-    HDFS-7998. HDFS Federation : Command mentioned to add a NN to existing
-    federated cluster is wrong (Ajith S via vinayakumarb)
-
-    HDFS-8222. Remove usage of "dfsadmin -upgradeProgress" from document which
-    is no longer supported. (J.Andreina via aajisaka)
-
-    HDFS-8108. Fsck should provide the info on mandatory option to be used along with "-blocks ,
-    -locations and -racks" (J.Andreina via umamahesh)
-
-    HDFS-8187. Remove usage of "-setStoragePolicy" and "-getStoragePolicy" using
-    dfsadmin cmd (as it is not been supported) (J.Andreina via vinayakumarb)
-
-    HDFS-8175. Provide information on snapshotDiff for supporting the comparison
-    between snapshot and current status (J.Andreina via vinayakumarb)
-
-    HDFS-8209. Support different number of datanode directories in MiniDFSCluster.
-    (surendra singh lilhore via vinayakumarb)
-
-    HDFS-6576. Datanode log is generating at root directory in security mode
-    (surendra singh lilhore via vinayakumarb)
-
-    HDFS-3384. DataStreamer thread should be closed immediatly when failed to
-    setup a PipelineForAppendOrRecovery (Uma Maheswara Rao G via vinayakumarb)
-
-    HDFS-6285. tidy an error log inside BlockReceiver. (Liang Xie via umamahesh)
-
-    HDFS-8346. libwebhdfs build fails during link due to unresolved external
-    symbols. (Chris Nauroth via wheat9)
-
-    HDFS-8274. NFS configuration nfs.dump.dir not working. (Ajith S via
-    Arpit Agarwal)
-
-    HDFS-8340. Fix NFS documentation of nfs.wtmax. (Ajith S via Arpit Agarwal)
-
-    HDFS-8311. DataStreamer.transfer() should timeout the socket InputStream.
-    (Esteban Gutierrez via Yongjun Zhang)
-
-    HDFS-8326. Documentation about when checkpoints are run is out of date.
-    (Misty Stanley-Jones via xyao)
-
-    HDFS-8097. TestFileTruncate is failing intermittently. (Rakesh R via
-    Arpit Agarwal)
-
-    HDFS-8351. Remove namenode -finalize option from document. (aajisaka)
-
-    HDFS-8362. Java Compilation Error in TestHdfsConfigFields.java
-    (Arshad Mohammad via vinayakumarb)
-
-    HDFS-8358. TestTraceAdmin fails (Masatake Iwasaki via kihwal)
-
-    HDFS-8380. Always call addStoredBlock on blocks which have been shifted
-    from one storage to another (cmccabe)
-
-    HDFS-8243. Files written by TestHostsFiles and TestNameNodeMXBean are
-    causing Release Audit Warnings. (Ruth Wisniewski via Arpit Agarwal)
-
-    HDFS-7728. Avoid updating quota usage while loading edits.
-    (Jing Zhao via wheat9)
-
-    HDFS-8150. Make getFileChecksum fail for blocks under construction
-    (J.Andreina via vinayakumarb)
-
-    HDFS-8371. Fix test failure in TestHdfsConfigFields for spanreceiver
-    properties. (Ray Chiang via aajisaka)
-
-    HDFS-8403. Eliminate retries in TestFileCreation
-    #testOverwriteOpenForWrite. (Arpit Agarwal via wheat9)
-
-    HDFS-6348. SecondaryNameNode not terminating properly on runtime exceptions
-    (Rakesh R via vinayakumarb)
-
-    HDFS-8454. Remove unnecessary throttling in TestDatanodeDeath.
-    (Arpit Agarwal)
-
-    HDFS-8268. Port conflict log for data node server is not sufficient
-    (Mohammad Shahid Khan via vinayakumarb)
-
-    HDFS-8407. hdfsListDirectory must set errno to 0 on success (Masatake
-    Iwasaki via Colin P. McCabe)
-
-    HDFS-7401. Add block info to DFSInputStream' WARN message when it adds
-    node

<TRUNCATED>

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