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https://issues.apache.org/jira/browse/PIG-116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573971#action_12573971
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Olga Natkovich commented on PIG-116:
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Update: we would add the call to the clean up the files just before the main
exit. This will solve the issue for normally completeing pig jobs but not for
jobs that were killed.
Hadoop team will consider fixing this in the 0.17 release
> pig leaves temp files behind
> ----------------------------
>
> Key: PIG-116
> URL: https://issues.apache.org/jira/browse/PIG-116
> Project: Pig
> Issue Type: Bug
> Reporter: Olga Natkovich
> Assignee: Olga Natkovich
>
> Currently, pig creates temp dirs via call to FileLocalizer.getTemporaryPath.
> They are created on the client and are mainly used to store data between 2
> M-R jobs. Pig then attempts to clean them up in the client's shutdown hook.
> The problem with this approach is that, because there is now way to order the
> shutdown hooks, in some cases, the DFS is already closed when we try to
> delete the files in which case a substention amount of data can be left in
> DFS. I see this issue more frequently with hadoop 0.16 perhaps because I had
> to add an extra shutdown hook to handle hod disconnects.
> The short term, I would like to propose the approach below:
> (1) If trash is configured on the cluster, use trash location to create temp
> directory that will expire in 7 days. The hope is that most jobs don't run
> longer that 7 days. The user can specify a longer interval via a command line
> switch
> (2) If trash is not enabled on the cluster, the location that we use now will
> be used
> (3) In the shutdown hook, we will attempt to cleanup. If the attempt fails
> and trash is enabled, we let trash handle it; otherwise we provide the list
> of locations to the user to clean. (I realize that this is not ideal but
> could not figure out a better way.)
> Longer term, I am talking with hadoop team to have better temp file support:
> https://issues.apache.org/jira/browse/HADOOP-2815
> Comments? Suggestions?
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