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Posted to common-dev@hadoop.apache.org by "Doug Cutting (JIRA)" <ji...@apache.org> on 2006/02/06 19:41:58 UTC
[jira] Moved: (HADOOP-9) mapred.local.dir temp dir. space
allocation limited by smallest area
[ http://issues.apache.org/jira/browse/HADOOP-9?page=all ]
Doug Cutting moved NUTCH-181 to HADOOP-9:
-----------------------------------------
Project: Hadoop (was: Nutch)
Key: HADOOP-9 (was: NUTCH-181)
Version: (was: 0.8-dev)
> mapred.local.dir temp dir. space allocation limited by smallest area
> ---------------------------------------------------------------------
>
> Key: HADOOP-9
> URL: http://issues.apache.org/jira/browse/HADOOP-9
> Project: Hadoop
> Type: Bug
> Components: indexer
> Environment: all
> Reporter: Paul Baclace
>
> 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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