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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6551) Rename with OVERWRITE may throw NPE when the target file/directory is a reference INode
Date Tue, 17 Jun 2014 04:59:01 GMT
Jing Zhao created HDFS-6551:
-------------------------------

             Summary: Rename with OVERWRITE 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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