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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8452) In WebHDFS, duplicate directory creation is not throwing exception.
Date Tue, 26 May 2015 02:57:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14558638#comment-14558638
] 

Haohui Mai commented on HDFS-8452:
----------------------------------

{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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