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Posted to common-dev@hadoop.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2008/08/22 14:34:52 UTC
[jira] Commented: (HADOOP-9) mapred.local.dir temp dir. space
allocation limited by smallest area
[ https://issues.apache.org/jira/browse/HADOOP-9?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624768#action_12624768 ]
Hudson commented on HADOOP-9:
-----------------------------
Integrated in Hadoop-trunk #581 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/581/])
> mapred.local.dir temp dir. space allocation limited by smallest area
> ---------------------------------------------------------------------
>
> Key: HADOOP-9
> URL: https://issues.apache.org/jira/browse/HADOOP-9
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Environment: all
> Reporter: Paul Baclace
> Assignee: Ari Rabkin
> Priority: Minor
> Fix For: 0.19.0
>
> Attachments: hadoop9.patch
>
>
> When mapred.local.dir is used to specify multiple temp dir. areas, space allocation limited by smallest area because the temp dir. selection algorithm is "round robin starting from a randomish point". When round robin is used with approximately constant sized chunks, the smallest area runs out of space first, and this is a fatal error.
> Workaround: only list local fs dirs in mapred.local.dir with similarly-sized available areas.
> I wrote a patch to JobConf (currenly being tested) which uses df to check available space (once a minute or less often) and then uses an efficient roulette selection to do allocation weighted by magnitude of available space.
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