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https://issues.apache.org/jira/browse/HDFS-8452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14558638#comment-14558638
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Haohui Mai commented on HDFS-8452:
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{quote}
1. If this is an Idempotent Operation when same file name is given it is
returning 1 ,ideally it should return 0 .
2. Check the documentation :
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/FileSystemShell.html#mkdir
Exit Code:Returns 0 on success and -1 on error.
{quote}
Please do not confuse the {{mkdir()}} utility in the FSShell with the
{{mkdirs()}} operation in HDFS. The utility checks whether the file exists to
make its behavior closer to the POSIX one. The {{mkdirs()}} operation, however,
is designed to be idempotent to simplify the process of handling failures. The
{{mkdirs()}} operation in WebHDFS has the same semantic of the one in HDFS.
> In WebHDFS, duplicate directory creation is not throwing exception.
> -------------------------------------------------------------------
>
> Key: HDFS-8452
> URL: https://issues.apache.org/jira/browse/HDFS-8452
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Jagadesh Kiran N
> Priority: Minor
>
> *Case 1 (CLI):*
> a. In HDFS Create a new Directory
> {code}./hdfs dfs -mkdir /new , A New directory will be
> created{code}
> b. Now Execute the same Command again
> {code} mkdir: `/new': File exists , Error message will be shown {code}
> *Case 2 (RestAPI) :*
> a. In HDFS Create a new Directory
> {code}curl -i -X PUT -L
> "http://host1:50070/webhdfs/v1/new1?op=MKDIRS&overwrite=false"{code}
> A New Directory will be created
> b. Now Execute the same webhdfs command again
> No exception will be thrown back to the client.
> {code}
> HTTP/1.1 200 OK
> Cache-Control: no-cache
> Expires: Thu, 21 May 2015 15:11:57 GMT
> Date: Thu, 21 May 2015 15:11:57 GMT
> Pragma: no-cache
> Content-Type: application/json
> Transfer-Encoding: chunked
> {code}
>
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