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Date: Thu, 6 Jan 2011 12:50:47 -0500 (EST)
From: "Tom White (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-2219) JT should not try to remove
 mapred.system.dir during startup
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-2219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12978424#action_12978424 ] 

Tom White commented on MAPREDUCE-2219:
--------------------------------------

> Unfortunately I couldn't use FileUtil.fullyDeleteContents because that method takes File and not Path/FileSystem.

I see. The patch has tests for this code, so +1 (pending Hudson).

> JT should not try to remove mapred.system.dir during startup
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-2219
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2219
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: mapreduce-2219.2.txt, mapreduce-2219.txt
>
>
> During startup, the JT tries to clean up mapred.system.dir by recursively removing it and then recreating it. This requires that mapred.system.dir is inside a directory owned by the mapred user. For example, if set to /system/mapred then /system must be owned by the mapred account. This isn't documented properly and also seems unnecessary. Instead we can remove the *contents* of mapred.system.dir instead of the directory itself.

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