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https://issues.apache.org/jira/browse/HDFS-6551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-6551:
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Summary: Rename with OVERWRITE option may throw NPE when the target
file/directory is a reference INode (was: Rename with OVERWRITE may throw NPE
when the target file/directory is a reference INode)
> Rename with OVERWRITE option may throw NPE when the target file/directory is
> a reference INode
> ----------------------------------------------------------------------------------------------
>
> Key: HDFS-6551
> URL: https://issues.apache.org/jira/browse/HDFS-6551
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Jing Zhao
> Assignee: Jing Zhao
>
> The following steps can reproduce the NPE:
> 1. create a snapshot on /
> 2. move /foo/file1 to /bar/
> 3. rename /foo/file2 to /bar/file1 with the OVERWRITE option
> After step 2, /bar/file1 is a DstReference inode. In step 3,
> FSDirectory#unprotectedRename first detaches the DstReference inode from the
> WithCount inode, then it still calls the cleanSubtree method of the
> corresponding INodeFile instance, which triggers the NPE. We should follow
> the same logic in FSDirectory#unprotectedDelete which skips the cleanSubtree
> call in this scenario.
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