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https://issues.apache.org/jira/browse/MAPREDUCE-1538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839136#action_12839136
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Scott Chen commented on MAPREDUCE-1538:
---------------------------------------
In the patch, we track the number of subdirectories and if it goes up to a
threshold, we delete the released cache.
Similar mechanism is there for the total size. So we just adapt from that.
> TrackerDistributedCacheManager can fail because the number of subdirectories
> reaches system limit
> -------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1538
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1538
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 0.22.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1538.patch
>
>
> TrackerDistributedCacheManager deletes the cached files when the size goes up
> to a configured number.
> But there is no such limit for the number of subdirectories. Therefore the
> number of subdirectories may grow large and exceed system limit.
> This will make TT cannot create directory when getLocalCache and fails the
> tasks.
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