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https://issues.apache.org/jira/browse/HDFS-8452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14557148#comment-14557148
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Jagadesh Kiran N commented on HDFS-8452:
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I have some queries regarding the same ., Iam confused with the”
idempotent operation” as both are client side request to the server.,
a. CLI :
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.
Query : a. Ideally -1 should return but in CLI 1 will get return for error
message
b. if it is Idempotent function why error is there, I feel it
should be consistent .
b. Rest API :
1. Your comments “ It should not overwrite ,should throw exception when
any file is there inside folder”
https://hadoop.apache.org/docs/current2/hadoop-project-dist/hadoop-common/filesystem/filesystem.html
if exists(FS, p) and not isDir(FS, p) :
raise [ParentNotDirectoryException, FileAlreadyExistsException,
IOException]
2. I tried this scenario also ,but still the same 200 will be returned ,
no exception will be thrown, so the condition mentioned about for file is not
working .Its overwriting but files still exists inside that folder.
3. I didn’t get which document is not proper and where it needs to be
changed ,the comment by Haohui Mai
Please clarify me the above.
> 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
> Fix For: 3.0.0
>
>
> *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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