amahussein opened a new pull request #3196:
URL: https://github.com/apache/hadoop/pull/3196
…and various FsDatasetImpl methods should use datanode readlock. Contributed
By Stephen O'Donnell and Ahmed Hussein
Backporting HDFS-15160 ReplicaMap, Disk Balancer, Directory Scanner and
various FsDatasetImpl methods should use datanode readlock.
Also backported the two jiras that fix unit tests:
- HDFS-15818
- HDFS-15457
The main Conflicts were as follow:
- main conflicts caused by [HDFS-10636. Modify ReplicaInfo to remove the
assumption that replica metadata and data are stored in
java.io.File.](https://issues.apache.org/jira/browse/HDFS-10636)
- `FsDatasetImpl.java#validateBlockFile` due to HDFS-10636
- `FsDatasetImpl.java#getFile` only exists in branch-2.10 and was
removed in HDFS-10636
- `DiskBalancer` does not exist in branch-2.10
- `FsDatasetImpl.java#moveBlockAcrossStorage` is different in branch-2.10
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