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HDFS-13901. INode access time is ignored because of race between open and rename. Contributed by Jinglun.

HDFS-12749. DN may not send block report to NN after NN restart. Contributed by Xiaoqiao He.

(cherry picked from commit c4e27ef7735acd6f91b73d2ecb0227f8dd75a2e4)

HDFS-12749. DN may not send block report to NN after NN restart. Contributed by Xiaoqiao He.

(cherry picked from commit c4e27ef7735acd6f91b73d2ecb0227f8dd75a2e4)

HDFS-12749. DN may not send block report to NN after NN restart. Contributed by Xiaoqiao He.

(cherry picked from commit c4e27ef7735acd6f91b73d2ecb0227f8dd75a2e4)

HDFS-12749. DN may not send block report to NN after NN restart. Contributed by Xiaoqiao He.

(cherry picked from commit c4e27ef7735acd6f91b73d2ecb0227f8dd75a2e4)

HDFS-12749. DN may not send block report to NN after NN restart. Contributed by Xiaoqiao He.

(cherry picked from commit c4e27ef7735acd6f91b73d2ecb0227f8dd75a2e4)

HDFS-12749. DN may not send block report to NN after NN restart. Contributed by Xiaoqiao He.

(cherry picked from commit c4e27ef7735acd6f91b73d2ecb0227f8dd75a2e4)

HDFS-12749. DN may not send block report to NN after NN restart. Contributed by Xiaoqiao He.

YARN-9915: Fix FindBug issue in QueueMetrics. Contributed by Prabhu Joseph.

(cherry picked from commit 83d148074f9299de02d5c896a3ed4e11292cba73)

YARN-9915: Fix FindBug issue in QueueMetrics. Contributed by Prabhu Joseph.

(cherry picked from commit 83d148074f9299de02d5c896a3ed4e11292cba73)

YARN-9915: Fix FindBug issue in QueueMetrics. Contributed by Prabhu Joseph.

YARN-9922. Fixed YARN javadoc errors from YARN-9699. Contributed by Peter Bacsko

HDFS-14913. Correct the value of available count in DFSNetworkTopology#chooseRandomWithStorageType(). Contributed by Ayush Saxena.

HDFS-14913. Correct the value of available count in DFSNetworkTopology#chooseRandomWithStorageType(). Contributed by Ayush Saxena.

HDFS-14913. Correct the value of available count in DFSNetworkTopology#chooseRandomWithStorageType(). Contributed by Ayush Saxena.

HDFS-14916. RBF: line breaks are missing from the output of 'hdfs dfsrouteradmin -ls'. Contributed by Xieming Li.

HDFS-14847. Erasure Coding: Blocks are over-replicated while EC decommissioning. Contributed by Fei Hui.

HDFS-14847. Erasure Coding: Blocks are over-replicated while EC decommissioning. Contributed by Fei Hui.

HDFS-14847. Erasure Coding: Blocks are over-replicated while EC decommissioning. Contributed by Fei Hui.

HDFS-14887. RBF: In Router Web UI, Observer Namenode Information displaying as Unavailable. Contributed by hemanthboyina.

HADOOP-16662. Remove unnecessary InnerNode check in NetworkTopology#add(). Contributed by Lisheng Sun.

HADOOP-16662. Remove unnecessary InnerNode check in NetworkTopology#add(). Contributed by Lisheng Sun.

HADOOP-16662. Remove unnecessary InnerNode check in NetworkTopology#add(). Contributed by Lisheng Sun.

HADOOP-16662. Remove unnecessary InnerNode check in NetworkTopology#add(). Contributed by Lisheng Sun.

HADOOP-16662. Remove unnecessary InnerNode check in NetworkTopology#add(). Contributed by Lisheng Sun.

HADOOP-16662. Remove unnecessary InnerNode check in NetworkTopology#add(). Contributed by Lisheng Sun.

HADOOP-16662. Remove unnecessary InnerNode check in NetworkTopology#add(). Contributed by Lisheng Sun.

YARN-9875. Improve fair scheduler configuration store on HDFS. Contributed by Prabhu Joseph

YARN-9884. Make container-executor mount logic modular Contributed by Eric Badger

HADOOP-16579. Upgrade to Curator 4.2.0 and ZooKeeper 3.5.5 (#1656). Contributed by Norbert Kalmár, Mate Szalay-Beko

* HADOOP-16579 - Upgrade to Apache Curator 4.2.0 and ZooKeeper 3.5.5

- Add a static initializer for the unit tests using ZooKeeper to enable

the four-letter-words diagnostic telnet commands. (this is an interface

that become disabled by default, so to keep the ZooKeeper 3.4.x behavior

we enabled it for the tests)

- Also fix ZKFailoverController to look for relevant fail-over ActiveAttempt

records. The new ZooKeeper seems to respond quicker during the fail-over

tests than the ZooKeeper, so we made sure to catch all the relevant records

by adding a new parameter to ZKFailoverontroller.waitForActiveAttempt().

Co-authored-by: Norbert Kalmár <nkalmar@cloudera.com>