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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2759) creating a file in hdfs should not automatically create the parent directories
Date Mon, 12 May 2008 06:37:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595989#action_12595989
] 

Amareshwari Sriramadasu commented on HADOOP-2759:
-------------------------------------------------

Here is a usecase : Creation of side-files by the task:
Every running job has a temporary output directory ${mapred.output.dir}/\_temporary, which
is deleted at the completion of the job. And a job can be declared SUCCESSFUL before killing
the speculative tasks. If the speculative task is creating a side file after the deletion
of \_temporary, since _create_ api creates the parent directories, \_temporary will be created
again in output directory. So, there is possibility that  \_temporary directory will be present
in the output directory read by a chained job. 
More discussion is available at http://issues.apache.org/jira/browse/HADOOP-2391?focusedCommentId=12566183#action_12566183
and http://issues.apache.org/jira/browse/HADOOP-2391?focusedCommentId=12566761#action_12566761

> creating a file in hdfs should not automatically create the parent directories
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-2759
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2759
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.17.0
>            Reporter: Owen O'Malley
>            Assignee: Pi Song
>             Fix For: 0.18.0
>
>         Attachments: hadoop-2759-complete1.patch, HADOOP-2759_1.patch, hadoop_tmp.patch
>
>
> I think it would be better if HDFS didn't automatically create directories for the user.
In particular, in clean up code, it would be nice if deleting a directory couldn't be undone
by mistake by a process that hasn't been killed yet creating a new file.

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