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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1141) Localization of a task's distributed-cache files gets blocked by deletion of old unrelated files when mapreduce.tasktracker.cache.local.size is hit.
Date Fri, 23 Oct 2009 09:44:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769151#action_12769151
] 

Vinod K V commented on MAPREDUCE-1141:
--------------------------------------


Here's roughly the offending code:

{code}
getLocalizeCache(URI uri) {
   localizeCache();

   if(currentDiskUsage > conf.get(mapreduce.tasktracker.cache.local.size)) {
      deleteOldFilesInCache();
   }
}
{code}

So, when mapreduce.tasktracker.cache.local.size is hit, localization of a task will not complete
_till_ the deleltion of (possibly a large number of) old DistributedCache files is completed
(which can possibly take long time).

Localization of a task should not ideally be blocked on cleanup of old files. Clean-up can
best be done in a separate thread.

> Localization of a task's distributed-cache files gets blocked by deletion of old unrelated
files when mapreduce.tasktracker.cache.local.size is hit.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1141
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1141
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.2, 0.21.0, 0.22.0
>            Reporter: Vinod K V
>


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