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HDFS-14856. Fetch file ACLs while mounting external store. (#1478)

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HDFS-14655. [SBN Read] Namenode crashes if one of The JN is down. Contributed by Ayush Saxena.

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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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HDFS-14655. [SBN Read] Namenode crashes if one of The JN is down. Contributed by Ayush Saxena.

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HDFS-14655. [SBN Read] Namenode crashes if one of The JN is down. Contributed by Ayush Saxena.

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HDFS-14655. [SBN Read] Namenode crashes if one of The JN is down. Contributed by Ayush Saxena.

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HDFS-14844. Make buffer of BlockReaderRemote#newBlockReader#BufferedOutputStream configurable. Contributed by Lisheng Sun.

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HDFS-14795. Add Throttler for writing block. Contributed by Lisheng Sun.

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HDFS-14771. Backport HDFS-14617 to branch-2 (Improve fsimage load time by writing sub-sections to the fsimage index). Contributed by He Xiaoqiao and Stephen O'Donnel.

Reviewed-by: Stephen O'Donnell <sodonnell@cloudera.com>

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

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HDFS-14821. Make HDFS-14617 (fsimage sub-sections) off by default. Contributed by Stephen O'Donnell.

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

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HDFS-14826. dfs.ha.zkfc.port property duplicated in hdfs-default.xml. Contributed by Renukaprasad C.

HDFS-12904. Add DataTransferThrottler to the Datanode transfers. Contributed by Lisheng Sun.

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HDFS-14630. Configuration.getTimeDurationHelper() should not log time unit warning in info log. Contributed by hemanthboyina.

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Make DataNodePeerMetrics#minOutlierDetectionSamples configurable (#1314). Contributed by Lisheng Sun.

Signed-off-by: sunlisheng <sunlisheng@xiaomi.com>

(cherry picked from commit 915271245b9a3f682409db380eb311ffd465b041)

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Make DataNodePeerMetrics#minOutlierDetectionSamples configurable (#1314). Contributed by Lisheng Sun.

Signed-off-by: sunlisheng <sunlisheng@xiaomi.com>

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Make DataNodePeerMetrics#minOutlierDetectionSamples configurable (#1314). Contributed by Lisheng Sun.

Signed-off-by: sunlisheng <sunlisheng@xiaomi.com>

(cherry picked from commit 915271245b9a3f682409db380eb311ffd465b041)

(cherry picked from commit b516d2ea7b2b96a1af350edd7964d3e082ee4fe7)

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HDFS-2470. NN should automatically set permissions on dfs.namenode.*.dir. Contributed by Siddharth Wagle.

(cherry picked from commit a64a43b77fb1032dcb66730a6b6257a24726c256)

(cherry picked from commit 8b1238171752d03712ae69d8464108ef0803ae10)

Conflicts:

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLog.java

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestStartup.java

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HDFS-2470. NN should automatically set permissions on dfs.namenode.*.dir. Contributed by Siddharth Wagle.

(cherry picked from commit a64a43b77fb1032dcb66730a6b6257a24726c256)

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HDFS-2470. NN should automatically set permissions on dfs.namenode.*.dir. Contributed by Siddharth Wagle.

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HDFS-14617. Improve fsimage load time by writing sub-sections to the fsimage index (#1028). Contributed by Stephen O'Donnell.

Reviewed-by: He Xiaoqiao <hexiaoqiao@apache.org>

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HDFS-14675. Increase Balancer Defaults Further. Contributed by Stephen O'Donnell.

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

Reviewed-by: Gabor Bota <gabota@apache.org>

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HDFS-14127. Add a description about the observer read configuration. Contributed by xiangheng.

HDFS-13505. Turn on HDFS ACLs by default. Contributed by Siyao Meng.

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HDFS-13783. Add an option to the Balancer to make it run as a long-running service. Contributed by Chen Zhang.

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HDFS-14370. Add exponential backoff to the edit log tailer to avoid spinning on empty edit tail requests. Contributed by Erik Krogen.

(cherry picked from 827dbb11e24be294b40088a8aa46086ba8ca4ba8)

(cherry picked from 016aa139406d1a151fbec3fb8912eb08e0f638d7)

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HDFS-14370. Add exponential backoff to the edit log tailer to avoid spinning on empty edit tail requests. Contributed by Erik Krogen.

(cherry picked from 827dbb11e24be294b40088a8aa46086ba8ca4ba8)

(cherry picked from 016aa139406d1a151fbec3fb8912eb08e0f638d7)

(cherry picked from f6ce2f4a50898b16556089fe18a6717a15570d85)

(cherry picked from 5657e45fb2b904bb31a4e3b70a360477ba288c15)

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HDFS-14370. Add exponential backoff to the edit log tailer to avoid spinning on empty edit tail requests. Contributed by Erik Krogen.

(cherry picked from 827dbb11e24be294b40088a8aa46086ba8ca4ba8)

(cherry picked from 016aa139406d1a151fbec3fb8912eb08e0f638d7)

(cherry picked from f6ce2f4a50898b16556089fe18a6717a15570d85)

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