You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-issues@hadoop.apache.org by "Yi Liu (JIRA)" <ji...@apache.org> on 2015/07/02 03:15:04 UTC

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

    [ https://issues.apache.org/jira/browse/HADOOP-12172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14611287#comment-14611287 ] 

Yi Liu commented on HADOOP-12172:
---------------------------------

+1, thanks Chris

> 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
>         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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)