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HDFS-15160. ReplicaMap, Disk Balancer, Directory Scanner and various FsDatasetImpl methods should use datanode readlock. Contributed by Stephen O'Donnell.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

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HDFS-15359. EC: Allow closing a file with committed blocks. Contributed by Ayush Saxena.

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HDFS-15355. Make the default block storage policy ID configurable. Contributed by Yang Yun.

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HDFS-15288. Add Available Space Rack Fault Tolerant BPP. Contributed by Ayush Saxena.

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Revert "HDFS-15202 Boost short circuit cache (rebase PR-1884) (#2016)"

This reverts commit ad9a6a0ee3d6cb3bde5e23c73151c0857d47ffd4.

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HDFS-15202 Boost short circuit cache (rebase PR-1884) (#2016)

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HDFS-15202 Boost short circuit cache (rebase PR-1884) (#2016)

(cherry picked from commit 2abcf7762ae74b936e1cedb60d5d2b4cc4ee86ea)

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Revert "HDFS-15202 Boost short circuit cache (rebase PR-1884) (#2016)"

This reverts commit 86e6aa8eec538e142044e2b6415ec1caff5e9cbd.

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HDFS-15207. VolumeScanner skip to scan blocks accessed during recent scan peroid. Contributed by Yang Yun.

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HDFS-15207. VolumeScanner skip to scan blocks accessed during recent scan peroid. Contributed by Yang Yun.

(cherry picked from commit 50caba1a92cb36ce78307d47ed7624ce216562fc)

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HDFS-15202 Boost short circuit cache (rebase PR-1884) (#2016)

Added parameter dfs.client.short.circuit.num improving HDFS-client's massive reading performance by create few instances ShortCircuit caches instead of one. It helps avoid locks and lets CPU do job.

(cherry picked from commit 86e6aa8eec538e142044e2b6415ec1caff5e9cbd)

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HDFS-15202 Boost short circuit cache (rebase PR-1884) (#2016)

Added parameter dfs.client.short.circuit.num improving HDFS-client's massive reading performance by create few instances ShortCircuit caches instead of one. It helps avoid locks and lets CPU do job.

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HDFS-15264. Backport Datanode detection to branch-2.10. Contributed by Lisheng Sun.

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HDFS-15356. Unify configuration `dfs.ha.allow.stale.reads` to DFSConfigKeys. Contributed by Xiaoqiao He.

(cherry picked from commit 178336f8a8bb291eb355bede729082f2f0382216)

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HDFS-15356. Unify configuration `dfs.ha.allow.stale.reads` to DFSConfigKeys. Contributed by Xiaoqiao He.

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HDFS-15350. Set dfs.client.failover.random.order to true as default. (#2008)

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HDFS-15255. Consider StorageType when DatanodeManager#sortLocatedBlock(). Contributed by Lisheng Sun.

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HDFS-15255. Consider StorageType when DatanodeManager#sortLocatedBlock(). Contributed by Lisheng Sun.

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HDFS-15243. Add an option to prevent sub-directories of protected directories from deletion. Contributed by liuyanyu.

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HDFS-14283. DFSInputStream to prefer cached replica. Contributed by Lisheng Sun.

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HDFS-14283. DFSInputStream to prefer cached replica. Contributed by Lisheng Sun.

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HADOOP-16988. Remove source code from branch-2. (aajisaka via jhung)

This closes #1959

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HDFS-15075. Remove process command timing from BPServiceActor. Contributed by Xiaoqiao He.

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HDFS-15154. Allow only hdfs superusers the ability to assign HDFS storage policies. Contributed by Siddharth Wagle.

Change-Id: I32d6dd2837945b8fc026a759aa367c55daefe348

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HDFS-13377. The owner of folder can set quota for his sub folder. Contributed by Yang Yun.

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HDFS-15200. Delete Corrupt Replica Immediately Irrespective of Replicas On Stale Storage. Contributed by Ayush Saxena.

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HDFS-14820. The default 8KB buffer of BlockReaderRemote#newBlockReader#BufferedOutputStream is too big. Contributed by Lisheng Sun.

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HDFS-15033. Support to save replica cached files to other place and make expired time configurable. Contributed by Yang Yun.

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HDFS-14861. Reset LowRedundancyBlocks Iterator periodically. Contributed by Stephen O'Donnell.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

(cherry picked from commit 900430b9907b590ed2d73a0d68f079c7f4d754b1)

(cherry picked from commit 2377649cdb1307a72a946b95a9a04f316c6483ef)

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HDFS-14861. Reset LowRedundancyBlocks Iterator periodically. Contributed by Stephen O'Donnell.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

(cherry picked from commit 900430b9907b590ed2d73a0d68f079c7f4d754b1)

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