[jira] [Created] (HDFS-5476) Snapshot: clean the blocks/files/directories under a renamed file/directory while deletion

["Jing Zhao (JIRA)" <ji...@apache.org>]

Jing Zhao created HDFS-5476:
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             Summary: Snapshot: clean the blocks/files/directories under a renamed file/directory while deletion
                 Key: HDFS-5476
                 URL: https://issues.apache.org/jira/browse/HDFS-5476
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.2.0
            Reporter: Jing Zhao
            Assignee: Jing Zhao


Currently DstReference#destroyAndCollectBlocks may fail to clean the subtree under the DstReference node for file/directory/snapshot deletion.

Use case 1:
# rename under-construction file with 0-sized blocks after snapshot.
# delete the renamed directory.

We need to make sure we delete the 0-sized block.

Use case 2:
# create snapshot s0 for /
# create a new file under /foo/bar/
# rename foo --> foo2
# create snapshot s1
# delete bar and foo2
# delete snapshot s1

We need to make sure we delete the file under /foo/bar since it is not included in snapshot s0.



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