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HDFS-12288. Fix DataNode's xceiver count calculation. 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-15242. Add metrics for operations hold lock times of FsDatasetImpl. Contributed by Xiaoqiao He.

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

Reviewed-by: Inigo Goiri <inigoiri@apache.org>

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

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HDFS-15158. The number of failed volumes mismatch with volumeFailures of Datanode metrics. Contributed by Yang Yun.

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HDFS-15158. The number of failed volumes mismatch with volumeFailures of Datanode metrics. Contributed by Yang Yun.

(cherry picked from commit 6191d4b4a0919863fda78e549ab6c60022e3ebc2)

(cherry picked from commit 1e3b0df6abcc1252907c41aaedb3e7e257bce497)

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HDFS-15158. The number of failed volumes mismatch with volumeFailures of Datanode metrics. Contributed by Yang Yun.

(cherry picked from commit 6191d4b4a0919863fda78e549ab6c60022e3ebc2)

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HDFS-14997. BPServiceActor processes commands from NameNode asynchronously. Contributed by Xiaoqiao He.

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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-14235. Handle ArrayIndexOutOfBoundsException in DataNodeDiskMetrics#slowDiskDetectionDaemon. Contributed by Ranith Sardar.

(cherry picked from commit 41e18feda3f5ff924c87c4bed5b5cbbaecb19ae1)

HDFS-14235. Handle ArrayIndexOutOfBoundsException in DataNodeDiskMetrics#slowDiskDetectionDaemon. Contributed by Ranith Sardar.

HDFS-14235. Handle ArrayIndexOutOfBoundsException in DataNodeDiskMetrics#slowDiskDetectionDaemon. Contributed by Ranith Sardar.

(cherry picked from commit 41e18feda3f5ff924c87c4bed5b5cbbaecb19ae1)

(cherry picked from commit b93b127956508072904b44098fdc1c0dfc899606)

HDFS-14045. Use different metrics in DataNode to better measure latency of heartbeat/blockReports/incrementalBlockReports of Active/Standby NN. Contributed by Jiandan Yang.

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HDFS-13942. [JDK10] Fix javadoc errors in hadoop-hdfs module. Contributed by Dinesh Chitlangia.

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HDFS-13055. Aggregate usage statistics from datanodes. Contributed by Ajay Kumar.

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HDFS-12409. Add metrics of execution time of different stages in EC recovery task. (Lei (Eddy) Xu)

(cherry picked from commit 73aed34dffa5e79f6f819137b69054c1dee2d4dd)

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HDFS-12409. Add metrics of execution time of different stages in EC recovery task. (Lei (Eddy) Xu)

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HADOOP-14503. Make RollingAverages a mutable metric. Contributed by Hanisha Koneru.

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HADOOP-14503. Make RollingAverages a mutable metric. Contributed by Hanisha Koneru.

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HDFS-11551. Support Timeout when checking single disk. Contributed by Hanisha Koneru.

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HDFS-11545. Propagate DataNode's slow disks info to the NameNode via Heartbeat. Contributed by Hanisha Koneru.

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HDFS-11551. Handle SlowDiskReport from DataNode at the NameNode. Contributed by Hanisha Koneru.

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HDFS-11534. Add counters for number of blocks in pending IBR. Contributed by Xiaobing Zhou.

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HDFS-11534. Add counters for number of blocks in pending IBR. Contributed by Xiaobing Zhou.

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HDFS-11545. Propagate DataNode's slow disks info to the NameNode via Heartbeats. Contributed by Hanisha Koneru.

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HDFS-11517. Include missed change in previous commit.

HDFS-11517. Expose slow disks via DataNode JMX. Contributed by Hanisha Koneru

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HDFS-11517. Expose slow disks via DataNode JMX. Contributed by Hanisha Koneru

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