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https://issues.apache.org/jira/browse/HADOOP-12172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14611287#comment-14611287
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Yi Liu commented on HADOOP-12172:
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+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.
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