[jira] [Created] (HADOOP-12172) FsShell mkdir -p makes an unnecessary check for the existence of the parent.

["Chris Nauroth (JIRA)" <ji...@apache.org>]

Chris Nauroth created HADOOP-12172:
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             Summary: FsShell mkdir -p makes an unnecessary check for the existence of the parent.
                 Key: HADOOP-12172
                 URL: https://issues.apache.org/jira/browse/HADOOP-12172
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth
            Priority: Minor


The {{mkdir}} command in {{FsShell}} checks for the existence of the parent of the directory and returns an error if it doesn't exist.  The {{-p}} option suppresses the error and allows the directory creation to continue, implicitly creating all missing intermediate directories.  However, the existence check still runs even with {{-p}} specified, and its result is ignored.  Depending on the file system, this is a wasteful RPC call (HDFS) or HTTP request (WebHDFS/S3/Azure) imposing extra latency for the client and extra load for the server.



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