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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12172) FsShell mkdir -p makes an unnecessary check for the existence of the parent.
Date Thu, 02 Jul 2015 02:55:04 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HADOOP-12172:
-----------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 2.8.0
           Status: Resolved  (was: Patch Available)

Yi and Brahma, thank you for the code reviews.  I have committed this to trunk and branch-2.

bq. The patch doesn't appear to include any new or modified tests.

The functionality was covered by existing unit tests.  I did manual testing by inspecting
the HDFS audit log to confirm that this change reduced the number of RPC calls.

> 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
>             Fix For: 2.8.0
>
>         Attachments: HADOOP-12172.001.patch
>
>
> 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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