[jira] [Created] (HDFS-7493) removedDst should be checked against null in finally block of FSDirRenameOp#unprotectedRenameTo()

[Ted Yu (JIRA)]

Ted Yu created HDFS-7493:
----------------------------

             Summary: removedDst should be checked against null in finally 
block of FSDirRenameOp#unprotectedRenameTo()
                 Key: HDFS-7493
                 URL: https://issues.apache.org/jira/browse/HDFS-7493
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


{code}
          removedDst = dstIIP.getLastINode();
          undoRemoveDst = true;
{code}
If removedDst is null, the following code in finally block may result in NPE:
{code}
        if (dstParent.isDirectory() &&
            dstParent.asDirectory().isWithSnapshot()) {
          dstParent.asDirectory().undoRename4DstParent(removedDst,
              dstIIP.getLatestSnapshotId());
{code}



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