Yufei Gu created YARN-8162:

             Summary: Method DirectoryCollection#verifyDirUsingMkdir isn't 
needed anymore
                 Key: YARN-8162
                 URL: https://issues.apache.org/jira/browse/YARN-8162
             Project: Hadoop YARN
          Issue Type: Bug
          Components: nodemanager
    Affects Versions: 3.1.0
            Reporter: Yufei Gu
            Assignee: Yufei Gu

First of all, DirectoryCollection#verifyDirUsingMkdir doesn't do what it claims 
to do, it creates a file but its Java doc says it create a dir. What's more, it 
is no longer needed after HADOOP-13738 (DiskChecker should perform some disk 
IO). It duplicates what HADOOP-13738 does. We should remove it.

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