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https://issues.apache.org/jira/browse/HADOOP-8873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702418#comment-13702418
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Akira AJISAKA commented on HADOOP-8873:
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On 1.2.0, mkdir doesn't fail if parent direcotry exists.
{code}
$ hadoop dfs -mkdir parent
$ hadoop dfs -mkdir parent/child
$ hadoop dfs -ls parent
Found 1 items
drwxr-xr-x - hadoop supergroup 0 2013-07-08 13:35
/user/hadoop/parent/child
{code}
If -p option is set, both parent/child2 and "-p" directories are created.
{code}
$ hadoop dfs -mkdir -p parent/child2
$ hadoop dfs -ls
Found 2 items
drwxr-xr-x - hadoop supergroup 0 2013-07-08 13:35 /user/hadoop/-p
drwxr-xr-x - hadoop supergroup 0 2013-07-08 13:35 /user/hadoop/parent
$ hadoop dfs -ls parent
Found 2 items
drwxr-xr-x - hadoop supergroup 0 2013-07-08 13:35
/user/hadoop/parent/child
drwxr-xr-x - hadoop supergroup 0 2013-07-08 13:35
/user/hadoop/parent/child2
{code}
> Port HADOOP-8175 (Add mkdir -p flag) to branch-1
> ------------------------------------------------
>
> Key: HADOOP-8873
> URL: https://issues.apache.org/jira/browse/HADOOP-8873
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 1.0.0
> Reporter: Eli Collins
> Labels: newbie
>
> Per HADOOP-8551 let's port the mkdir -p option to branch-1 for a 1.x release
> to help users transition to the new shell behavior. In Hadoop 2.x mkdir
> currently requires the -p option to create parent directories but a program
> that specifies it won't work on 1.x since it doesn't support this option.
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