amahussein opened a new pull request #3200:
URL: https://github.com/apache/hadoop/pull/3200
- Backporting HDFS-15160 to branch-3.2
- First: [HDFS-15150. Introduce read write lock to Datanode. Contributed
Stephen O'Donnell](https://issues.apache.org/jira/browse/HDFS-15150)
- `git cherry-pick -x d7c136b9ed6d99e1b03f5b89723b3a20df359ba8`
- main conflicts:
- `FsDatasetImpl.java.deepCopyReplica`
- `FoldedTreeSet` is not used in branch-3.2
- testing:
- ```
mvn test -Dtest=TestWriteToReplica,TestReplicaMap,\
TestProvidedImpl,TestFsVolumeList,TestInterDatanodeProtocol
```
- Second: [HDFS-15160](https://issues.apache.org/jira/browse/HDFS-15160)
- `git cherry-pick -x 2a67e2b1a0e3a5f91056f5b977ef9c4c07ba6718`
- main conflicts:
- `ReplicaMap.java`
- `FsDatasetImpl.java.deepCopyReplica`
- `FsDatasetImpl.java.addVolume` different code. I passed the red and
write locks to `tempVolumeMap`
- `DirectoryScanner.scan()` conflict in the entire loop.
- [HDFS-15415. Reduce locking in Datanode
DirectoryScanner](https://issues.apache.org/jira/browse/HDFS-15415) Which is
already committed to branch-2.10 removes what
[HDFS-15160](https://issues.apache.org/jira/browse/HDFS-15160) has added. So, I
skipped that.
- Third: [HDFS-15457. TestFsDatasetImpl fails intermittently
(#2407)](https://issues.apache.org/jira/browse/HDFS-15457) and [HDFS-15818. Fix
TestFsDatasetImpl.testReadLockCanBeDisabledByConfig
(#2679)](https://issues.apache.org/jira/browse/HDFS-15818)
- `git cherry-pick -x 98097b8f19789605b9697f6a959da57261e0fe19
9434c1eccc255a25ea5e11f6d8c9e1f83996d6b4`
- main conflicts:
- Java imports
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