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https://issues.apache.org/jira/browse/HDFS-6551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14037408#comment-14037408
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Hudson commented on HDFS-6551:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #1806 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1806/])
HDFS-6551. Rename with OVERWRITE option may throw NPE when the target
file/directory is a reference INode. Contributed by Jing Zhao. (jing9:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1603612)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestRenameWithSnapshots.java
> 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
> Components: namenode, snapshots
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Fix For: 2.5.0
>
> Attachments: HDFS-6551.000.patch
>
>
> 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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