2014-11-06 04:33:26 +00:00
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BREAKDOWN OF HDFS-7285 SUBTASKS AND RELATED JIRAS
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HDFS-7347. Configurable erasure coding policy for individual files and
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2015-03-25 10:01:03 +00:00
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directories ( Zhe Zhang via vinayakumarb )
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2015-03-31 09:42:09 +00:00
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HDFS-7339. Representing striped block groups in NameNode with hierarchical
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naming protocol ( Zhe Zhang )
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HDFS-7652. Process block reports for erasure coded blocks (Zhe Zhang)
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HDFS-7716. Erasure Coding: extend BlockInfo to handle EC info (Jing Zhao)
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HDFS-7749. Erasure Coding: Add striped block support in INodeFile (Jing Zhao)
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HDFS-7837. Erasure Coding: allocate and persist striped blocks in NameNode
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(Jing Zhao via Zhe Zhang)
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HDFS-7872. Erasure Coding: INodeFile.dumpTreeRecursively() supports to print
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striped blocks (Takuya Fukudome via jing9)
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HDFS-7853. Erasure coding: extend LocatedBlocks to support reading from
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striped files (Jing Zhao)
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HDFS-7826. Erasure Coding: Update INodeFile quota computation for striped
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blocks ( Kai Sasaki via jing9 )
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HDFS-7912. Erasure Coding: track BlockInfo instead of Block in
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UnderReplicatedBlocks and PendingReplicationBlocks (Jing Zhao)
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HDFS-7369. Erasure coding: distribute recovery work for striped blocks to
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DataNode (Zhe Zhang)
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HDFS-7864. Erasure Coding: Update safemode calculation for striped blocks
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(GAO Rui via jing9)
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HDFS-7827. Erasure Coding: support striped blocks in non-protobuf fsimage
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( Hui Zheng via jing9 )
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HDFS-7616. Add a test for BlockGroup support in FSImage.
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2015-03-25 10:01:03 +00:00
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(Takuya Fukudome via szetszwo)
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2015-03-31 09:42:09 +00:00
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HDFS-7907. Erasure Coding: track invalid, corrupt, and under-recovery striped
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blocks in NameNode (Jing Zhao)
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HDFS-8005. Erasure Coding: simplify striped block recovery work computation
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2015-04-03 22:22:50 +00:00
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and add tests (Jing Zhao)
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HDFS-7617. Add unit tests for editlog transactions for EC
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(Hui Zheng via Zhe Zhang)
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HDFS-7839. Erasure coding: implement facilities in NameNode to create and
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2015-04-08 07:18:59 +00:00
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manage EC zones (Zhe Zhang)
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2015-04-15 06:53:07 +00:00
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HDFS-7969. Erasure coding: NameNode support for lease recovery of striped
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block groups. (Zhe Zhang)
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HDFS-7782. Erasure coding: pread from files in striped layout.
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(Zhe Zhang and Jing Zhao via Zhe Zhang)
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2015-04-08 07:18:59 +00:00
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HDFS-8023. Erasure Coding: retrieve eraure coding schema for a file from
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2015-04-08 17:30:02 +00:00
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NameNode (vinayakumarb)
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2015-05-20 00:25:27 +00:00
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2015-04-09 16:16:28 +00:00
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HDFS-8074. Define a system-wide default EC schema. (Kai Zheng)
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2015-04-15 06:53:07 +00:00
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HDFS-8077. Erasure coding: fix bugs in EC zone and symlinks.
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(Jing Zhao and Zhe Zhang via Jing Zhao)
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2015-04-10 17:03:37 +00:00
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HDFS-8104. Make hard-coded values consistent with the system default schema first before remove them. (Kai Zheng)
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2015-04-10 09:37:32 +00:00
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HDFS-7889. Subclass DFSOutputStream to support writing striping layout files. (Li Bo via Kai Zheng)
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HDFS-8090. Erasure Coding: Add RPC to client-namenode to list all
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2015-04-15 06:39:16 +00:00
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ECSchemas loaded in Namenode. (vinayakumarb)
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2015-04-15 06:53:07 +00:00
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HDFS-8122. Erasure Coding: Support specifying ECSchema during creation of ECZone.
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(Vinayakumar B via Zhe Zhang)
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HDFS-8114. Erasure coding: Add auditlog FSNamesystem#createErasureCodingZone if this
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operation fails. (Rakesh R via Zhe Zhang)
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2015-04-15 06:39:16 +00:00
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HDFS-8123. Erasure Coding: Better to move EC related proto messages to a
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2015-04-15 11:08:22 +00:00
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separate erasurecoding proto file (Rakesh R via vinayakumarb)
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2015-04-16 20:16:37 +00:00
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HDFS-7349. Support DFS command for the EC encoding (vinayakumarb)
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2015-04-20 09:34:49 +00:00
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HDFS-8120. Erasure coding: created util class to analyze striped block groups.
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(Contributed by Zhe Zhang and Li Bo via Jing Zhao)
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2015-04-16 20:16:37 +00:00
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HDFS-7994. Detect if resevered EC Block ID is already used during namenode
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startup. (Hui Zheng via szetszwo)
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2015-04-17 19:05:31 +00:00
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HDFS-8167. BlockManager.addBlockCollectionWithCheck should check if the block is a striped block. (Hui Zheng via zhz).
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2015-04-18 17:50:45 +00:00
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2015-04-20 09:34:49 +00:00
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HDFS-8166. DFSStripedOutputStream should not create empty blocks. (Jing Zhao)
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HDFS-7937. Erasure Coding: INodeFile quota computation unit tests.
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(Kai Sasaki via Jing Zhao)
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HDFS-8145. Fix the editlog corruption exposed by failed TestAddStripedBlocks.
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(Jing Zhao)
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2015-04-18 17:50:45 +00:00
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HDFS-8146. Protobuf changes for BlockECRecoveryCommand and its fields for
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making it ready for transfer to DN (Uma Maheswara Rao G via vinayakumarb)
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2015-04-20 09:34:49 +00:00
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HDFS-8181. createErasureCodingZone sets retryCache state as false always
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(Uma Maheswara Rao G via vinayakumarb)
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2015-04-21 00:42:02 +00:00
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HDFS-8190. StripedBlockUtil.getInternalBlockLength may have overflow error.
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(szetszwo)
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2015-04-22 03:56:39 +00:00
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HDFS-8216. TestDFSStripedOutputStream should use BlockReaderTestUtil to
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create BlockReader. (szetszwo via Zhe Zhang)
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2015-05-20 00:25:27 +00:00
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2015-04-22 04:03:07 +00:00
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HDFS-8212. DistributedFileSystem.createErasureCodingZone should pass schema
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in FileSystemLinkResolver. (szetszwo via Zhe Zhang)
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2015-04-22 14:00:14 +00:00
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HDFS-8024. Erasure Coding: ECworker frame, basics, bootstraping and configuration.
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(umamahesh)
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2015-04-22 21:48:54 +00:00
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HDFS-8156. Add/implement necessary APIs even we just have the system default
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schema. (Kai Zheng via Zhe Zhang)
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2015-04-23 16:19:12 +00:00
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HDFS-8136. Client gets and uses EC schema when reads and writes a stripping
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2015-04-23 22:43:04 +00:00
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file. (Kai Sasaki via Kai Zheng)
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HDFS-8233. Fix DFSStripedOutputStream#getCurrentBlockGroupBytes when the last
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stripe is at the block group boundary. (jing9)
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2015-04-23 22:48:21 +00:00
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HDFS-8223. Should calculate checksum for parity blocks in DFSStripedOutputStream.
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(Yi Liu via jing9)
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2015-04-24 16:30:38 +00:00
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HDFS-8228. Erasure Coding: SequentialBlockGroupIdGenerator#nextValue may cause
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block id conflicts (Jing Zhao via Zhe Zhang)
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2015-04-25 05:36:15 +00:00
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HDFS-8033. Erasure coding: stateful (non-positional) read from files in
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striped layout (Zhe Zhang)
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2015-04-28 08:44:33 +00:00
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HDFS-8230. Erasure Coding: Ignore DatanodeProtocol#DNA_ERASURE_CODING_RECOVERY
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2015-04-28 08:54:17 +00:00
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commands from standbynode if any (vinayakumarb)
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HDFS-8189. ClientProtocol#createErasureCodingZone API was wrongly annotated
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2015-04-28 20:42:24 +00:00
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as Idempotent (vinayakumarb)
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HDFS-8235. Erasure Coding: Create DFSStripedInputStream in DFSClient#open.
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(Kai Sasaki via jing9)
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2015-04-29 22:53:31 +00:00
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HDFS-8272. Erasure Coding: simplify the retry logic in DFSStripedInputStream
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(stateful read). (Jing Zhao via Zhe Zhang)
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2015-04-30 06:49:52 +00:00
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HDFS-8282. Erasure coding: move striped reading logic to StripedBlockUtil.
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(Zhe Zhang)
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2015-04-30 07:13:32 +00:00
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HDFS-8183. Erasure Coding: Improve DFSStripedOutputStream closing of
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datastreamer threads. (Rakesh R via Zhe Zhang)
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2015-05-01 02:42:29 +00:00
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HDFS-8308. Erasure Coding: NameNode may get blocked in waitForLoadingFSImage()
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when loading editlog. (jing9)
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2015-05-01 22:59:58 +00:00
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HDFS-7949. WebImageViewer need support file size calculation with striped
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blocks. (Rakesh R via Zhe Zhang)
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2015-05-04 18:24:35 +00:00
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HDFS-8316. Erasure coding: refactor EC constants to be consistent with HDFS-8249.
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(Zhe Zhang via jing9)
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2015-05-04 21:44:58 +00:00
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HDFS-8281. Erasure Coding: implement parallel stateful reading for striped layout.
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(jing9)
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2015-05-05 05:52:52 +00:00
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HDFS-8137. Send the EC schema to DataNode via EC encoding/recovering command(umamahesh)
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2015-05-05 06:24:30 +00:00
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HDFS-8242. Erasure Coding: XML based end-to-end test for ECCli commands
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(Rakesh R via vinayakumarb)
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2015-05-05 13:55:21 +00:00
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HDFS-8324. Add trace info to DFSClient#getErasureCodingZoneInfo(..) (vinayakumarb via
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umamahesh)
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2015-05-20 00:25:27 +00:00
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2015-05-05 23:26:49 +00:00
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HDFS-7672. Handle write failure for stripping blocks and refactor the
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existing code in DFSStripedOutputStream and StripedDataStreamer. (szetszwo)
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2015-05-05 23:33:56 +00:00
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HDFS-7348. Erasure Coding: DataNode reconstruct striped blocks.
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(Yi Liu via Zhe Zhang)
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2015-05-06 22:34:37 +00:00
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HADOOP-11921. Enhance tests for erasure coders. (Kai Zheng)
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HDFS-8334. Erasure coding: rename DFSStripedInputStream related test
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classes. (Zhe Zhang)
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2015-05-07 10:56:01 +00:00
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HDFS-8129. Erasure Coding: Maintain consistent naming for Erasure Coding related classes - EC/ErasureCoding
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(umamahesh)
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2015-05-07 18:06:40 +00:00
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HDFS-8203. Erasure Coding: Seek and other Ops in DFSStripedInputStream.
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(Yi Liu via jing9)
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2015-05-07 18:52:49 +00:00
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HDFS-8289. Erasure Coding: add ECSchema to HdfsFileStatus. (Yong Zhang via
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jing9)
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2015-05-08 20:56:56 +00:00
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HDFS-8355. Erasure Coding: Refactor BlockInfo and BlockInfoUnderConstruction.
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(Tsz Wo Nicholas Sze via jing9)
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2015-05-12 04:10:23 +00:00
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HDFS-7678. Erasure coding: DFSInputStream with decode functionality (pread).
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(Zhe Zhang)
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2015-05-12 18:43:04 +00:00
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HDFS-8372. Erasure coding: compute storage type quotas for striped files,
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to be consistent with HDFS-8327. (Zhe Zhang via jing9)
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2015-05-12 21:31:28 +00:00
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HDFS-8368. Erasure Coding: DFS opening a non-existent file need to be
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handled properly (Rakesh R via zhz)
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2015-05-13 00:48:56 +00:00
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HDFS-8363. Erasure Coding: DFSStripedInputStream#seekToNewSource. (yliu)
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2015-05-13 06:10:25 +00:00
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HDFS-8195. Erasure coding: Fix file quota change when we complete/commit
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the striped blocks. (Takuya Fukudome via zhz)
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2015-05-13 07:13:39 +00:00
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HDFS-8364. Erasure coding: fix some minor bugs in EC CLI
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(Walter Su via vinayakumarb)
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2015-05-14 05:57:48 +00:00
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HDFS-8391. NN should consider current EC tasks handling count from DN while
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assigning new tasks. (umamahesh)
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2015-05-18 16:10:30 +00:00
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HDFS-8367. BlockInfoStriped uses EC schema. (Kai Sasaki via Kai Zheng)
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2015-05-18 22:08:30 +00:00
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2015-05-19 06:59:23 +00:00
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HDFS-8352. Erasure Coding: test webhdfs read write stripe file. (waltersu4549)
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2015-05-18 22:08:30 +00:00
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HDFS-8417. Erasure Coding: Pread failed to read data starting from not-first stripe.
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(Walter Su via jing9)
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2015-05-19 02:06:34 +00:00
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HDFS-8418. Fix the isNeededReplication calculation for Striped block in NN.
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(Yi Liu via jing9)
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2015-05-19 05:55:27 +00:00
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HDFS-8320. Erasure coding: consolidate striping-related terminologies. (zhz)
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2015-05-19 20:58:50 +00:00
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HDFS-8366. Erasure Coding: Make the timeout parameter of polling blocking queue
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configurable in DFSStripedOutputStream. (Li Bo)
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2015-05-19 06:59:23 +00:00
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HDFS-8378. Erasure Coding: Few improvements for the erasure coding worker.
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(Rakesh R via waltersu4549)
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2015-05-19 20:58:50 +00:00
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HDFS-8375. Add cellSize as an XAttr to ECZone. ( Vinayakumar B via zhz).
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2015-05-20 00:25:27 +00:00
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HDFS-8428. Erasure Coding: Fix the NullPointerException when deleting file.
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(Yi Liu via zhz).
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2015-05-20 04:19:51 +00:00
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HDFS-8323. Bump GenerationStamp for write faliure in DFSStripedOutputStream.
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(Tsz Wo Nicholas Sze via jing9)
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2015-05-20 21:52:51 +00:00
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HDFS-8427. Remove dataBlockNum and parityBlockNum from BlockInfoStriped.
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(Kai Sasaki via jing9)
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2015-05-20 22:37:50 +00:00
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HDFS-8186. Erasure coding: Make block placement policy for EC file configurable.
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(Walter Su via zhz)
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2015-05-21 21:40:14 +00:00
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HDFS-8294. Erasure Coding: Fix Findbug warnings present in erasure coding.
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(Rakesh R via zhz)
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2015-05-22 02:25:53 +00:00
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HDFS-8441. Erasure Coding: make condition check earlier for setReplication.
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(waltersu4549)
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2015-05-24 15:07:34 +00:00
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HDFS-7768. Change fsck to support EC files. (Takanobu Asanuma via szetszwo)
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2015-05-25 08:13:29 +00:00
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HDFS-8382. Remove chunkSize and initialize from erasure coder. (Kai Zheng)
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2015-05-25 06:27:17 +00:00
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HDFS-8408. Revisit and refactor ErasureCodingInfo (vinayakumarb)
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2015-05-26 23:06:50 +00:00
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HDFS-8479. Erasure coding: fix striping related logic in FSDirWriteFileOp to
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sync with HDFS-8421. (Zhe Zhang via jing9)
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2015-06-01 16:37:29 +00:00
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HDFS-8481. Erasure coding: remove workarounds in client side stripped blocks
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recovering. (zhz)
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2015-06-02 11:08:43 +00:00
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HDFS-8336. Expose some administrative erasure coding operations to HdfsAdmin
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(Uma Maheswara Rao G via vinayakumarb)
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2015-06-02 11:11:19 +00:00
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HDFS-8444. Erasure Coding: fix cannot rename a zone dir
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(Walter Su via vinayakumarb)
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2015-06-02 22:35:49 +00:00
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HDFS-8517. Fix a decoding issue in stripped block recovering in client side.
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(Kai Zheng via jing9)
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2015-06-02 23:14:08 +00:00
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HDFS-8453. Erasure coding: properly handle start offset for internal blocks
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in a block group. (Zhe Zhang via jing9)
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2015-06-03 18:51:58 +00:00
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HDFS-7621. Erasure Coding: update the Balancer/Mover data migration logic.
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(Walter Su via zhz)
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2015-06-04 06:41:38 +00:00
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HDFS-8328. Follow-on to update decode for DataNode striped blocks
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reconstruction. (yliu)
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2015-06-05 01:16:41 +00:00
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HDFS-8319. Erasure Coding: support decoding for stateful read.
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(Jing Zhao via zhz)
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2015-06-05 20:39:37 +00:00
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HDFS-8460. Erasure Coding: stateful read result doesn't match data
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occasionally because of flawed test. (Walter Su via zhz)
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2015-06-10 05:12:45 +00:00
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HDFS-8556. Erasure Coding: Fix usage of 'createZone' (vinayakumarb)
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2015-06-11 02:26:07 +00:00
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HDFS-8571. Fix TestErasureCodingCli test (Vinayakumar B via waltersu4549)
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2015-06-11 05:18:02 +00:00
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HDFS-8450. Erasure Coding: Consolidate erasure coding zone related
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implementation into a single class (Rakesh R via vinayakumarb)
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2015-06-12 21:48:53 +00:00
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HDFS-8585. Erasure Coding: Remove dataBlockNum and parityBlockNum from
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StripedBlockProto. (Yi Liu via jing9)
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2015-06-14 07:39:19 +00:00
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HDFS-8559. Erasure Coding: fix non-protobuf fsimage for striped blocks.
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(Jing Zhao via yliu)
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2015-06-17 18:35:31 +00:00
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HDFS-8580. Erasure coding: Persist cellSize in BlockInfoStriped and
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StripedBlocksFeature. (Walter Su via jing9)
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2015-06-18 08:49:49 +00:00
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HDFS-8466. Refactor BlockInfoContiguous and fix NPE in
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2015-06-19 17:23:45 +00:00
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TestBlockInfo#testCopyConstructor() (vinayakumarb)
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HDFS-8254. Avoid assigning a leading streamer in StripedDataStreamer to
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tolerate datanode failure. (Tsz Wo Nicholas Sze via jing9)
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2015-06-19 18:53:05 +00:00
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HDFS-8543. Erasure Coding: processOverReplicatedBlock() handles striped block.
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(Walter Su via jing9)
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2015-06-19 21:07:38 +00:00
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HDFS-8602. Erasure Coding: Client can't read(decode) the EC files which have
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corrupt blocks. (jing9 and Kai Sasaki)
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2015-06-24 05:29:28 +00:00
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HDFS-8567. Erasure Coding: SafeMode handles file smaller than a full stripe.
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(Walter Su via jing9)
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2015-06-24 15:39:05 +00:00
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HDFS-8253. DFSStripedOutputStream.closeThreads releases cellBuffers
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multiple times. (Kai Sasaki via szetszwo)
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2015-06-30 05:32:13 +00:00
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HDFS-8468. 2 RPC calls for every file read in DFSClient#open(..) resulting in
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2015-07-06 11:14:18 +00:00
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double Audit log entries (vinayakumarb)
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HDFS-8684. Erasure Coding: fix some block number calculation for striped
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block. (yliu)
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2015-07-06 23:39:47 +00:00
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HDFS-8461. Erasure coding: fix priority level of UnderReplicatedBlocks for
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striped block. (Walter Su via jing9)
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2015-07-09 08:18:05 +00:00
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HDFS-8719. Erasure Coding: client generates too many small packets when
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writing parity data. (Li Bo via waltersu4549)
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2015-07-09 17:55:28 +00:00
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HDFS-8563. Erasure Coding: fsck handles file smaller than a full stripe.
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(Walter Su via jing9)
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2015-07-09 21:07:37 +00:00
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HDFS-8484. Erasure coding: Two contiguous blocks occupy IDs belong to same
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striped group. (Walter Su via jing9)
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2015-07-13 04:41:36 +00:00
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HDFS-8744. Erasure Coding: the number of chunks in packet is not updated
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when writing parity data. (Li Bo)
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2015-07-13 18:41:18 +00:00
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HDFS-8669. Erasure Coding: handle missing internal block locations in
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DFSStripedInputStream. (jing9)
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2015-07-14 17:55:58 +00:00
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HDFS-8702. Erasure coding: update BlockManager.blockHasEnoughRacks(..) logic
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for striped block. (Kai Sasaki via jing9)
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2015-07-14 20:10:51 +00:00
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HDFS-8734. Erasure Coding: fix one cell need two packets. (Walter Su via
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jing9)
|
2015-07-15 14:35:19 +00:00
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HDFS-8619. Erasure Coding: revisit replica counting for striped blocks.
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(Jing Zhao via yliu)
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2015-07-15 16:49:32 +00:00
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HDFS-8058. Erasure coding: use BlockInfo[] for both striped and contiguous
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blocks in INodeFile. (Zhe Zhang and Yi Liu via zhz)
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2015-07-16 03:13:04 +00:00
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HDFS-8787. Erasure coding: rename BlockInfoContiguousUC and BlockInfoStripedUC
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to be consistent with trunk. (zhz)
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2015-07-20 02:18:34 +00:00
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HDFS-8433. Erasure coding: set blockToken in LocatedStripedBlock.(waltersu4549)
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2015-07-21 22:47:26 +00:00
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HDFS-8760. Erasure Coding: reuse BlockReader when reading the same block in pread.
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(jing9)
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2015-07-22 00:00:49 +00:00
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HDFS-8781. Erasure Coding: Correctly handle BlockManager#InvalidateBlocks for
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striped block. (Yi Liu via jing9)
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2015-07-23 18:42:02 +00:00
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HDFS-8813. Erasure Coding: Client no need to decode missing parity blocks.
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(Walter Su via jing9)
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2015-07-24 20:52:50 +00:00
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HDFS-8798. Erasure Coding: fix DFSStripedInputStream/DFSStripedOutputStream
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re-fetch token when expired. (Walter Su via jing9)
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2015-07-25 02:07:40 +00:00
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HDFS-8769. Erasure coding: unit test for SequentialBlockGroupIdGenerator.
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(Rakesh R via waltersu4549)
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2015-07-31 19:16:15 +00:00
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HDFS-8202. Improve end to end stirpping file test to add erasure recovering
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test. (Xinwei Qin via zhz)
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2015-08-04 00:03:15 +00:00
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HDFS-8804. Erasure Coding: use DirectBufferPool in DFSStripedInputStream for
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buffer allocation. (jing9)
|
2015-08-04 22:23:39 +00:00
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HDFS-8399. Erasure Coding: unit test the behaviour of BlockManager recovery
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work for the deleted blocks. (Rakesh R via zhz)
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2015-08-06 02:11:50 +00:00
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HDFS-8857. Erasure Coding: Fix ArrayIndexOutOfBoundsException in
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TestWriteStripedFileWithFailure. (Li Bo)
|
2015-08-07 18:25:20 +00:00
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HDFS-8827. Erasure Coding: Fix NPE when NameNode processes over-replicated
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striped blocks. (Walter Su and Takuya Fukudome via jing9)
|
2015-08-13 17:04:45 +00:00
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HDFS-8854. Erasure coding: add ECPolicy to replace schema+cellSize in
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hadoop-hdfs. (Walter Su via zhz)
|
2015-08-14 22:16:22 +00:00
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HDFS-8220. Erasure Coding: StripedDataStreamer fails to handle the
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blocklocations which doesn't satisfy BlockGroupSize. (Rakesh R via zhz)
|
2015-08-27 01:09:52 +00:00
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HDFS-8838. Erasure Coding: Tolerate datanode failures in DFSStripedOutputStream
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when the data length is small. (szetszwo via waltersu4549)
|
2015-08-27 08:02:30 +00:00
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HDFS-8909. Erasure coding: update BlockInfoContiguousUC and BlockInfoStripedUC
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to use BlockUnderConstructionFeature. (Jing Zhao via waltersu4549)
|
2015-09-02 18:45:45 +00:00
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HDFS-8937. Erasure coding: do not throw exception when setting replication on
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EC file. (Gao Rui via jing9)
|
2015-09-03 00:41:08 +00:00
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HDFS-8978. Erasure coding: fix 2 failed tests of DFSStripedOutputStream.
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(Walter Su via jing9)
|
2015-09-10 06:07:20 +00:00
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HDFS-8833. Erasure coding: store EC schema and cell size in INodeFile and
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eliminate notion of EC zones. (zhz)
|
2015-09-10 23:31:37 +00:00
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HDFS-8853. Erasure Coding: Provide ECSchema validation when setting EC
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policy. (andreina via zhz)
|
2015-09-12 07:59:25 +00:00
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HDFS-8975. Erasure coding : Fix random failure in TestSafeModeWithStripedFile
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(J.Andreina via vinayakumarb)
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2015-09-15 17:16:45 +00:00
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HDFS-7351. Document the HDFS Erasure Coding feature.
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(umamahesh and Zhe Zhang via wang)
|
2015-09-15 17:43:13 +00:00
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HDFS-8899. Erasure Coding: use threadpool for EC recovery tasks on DataNode.
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(Rakesh R via zhz)
|
2015-09-17 16:56:32 +00:00
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HDFS-9088. Cleanup erasure coding documentation. (wang via zhz)
|
2015-09-17 21:52:37 +00:00
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HDFS-9097. Erasure coding: update EC command "-s" flag to "-p" when
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specifying policy. (zhz)
|
2015-09-18 17:45:29 +00:00
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HDFS-9086. Rename dfs.datanode.stripedread.threshold.millis to
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dfs.datanode.stripedread.timeout.millis. (wang via zhz)
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