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Posted to common-issues@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2016/05/20 01:22:13 UTC
[jira] [Commented] (HADOOP-10048) LocalDirAllocator should avoid
holding locks while accessing the filesystem
[ https://issues.apache.org/jira/browse/HADOOP-10048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15292506#comment-15292506 ]
Junping Du commented on HADOOP-10048:
-------------------------------------
The patch is a bit old. Kick off Jenkins test manually again. Will start to review it from there.
[~jlowe], this long existing issue is still valid now. Isn't it?
> LocalDirAllocator should avoid holding locks while accessing the filesystem
> ---------------------------------------------------------------------------
>
> Key: HADOOP-10048
> URL: https://issues.apache.org/jira/browse/HADOOP-10048
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.3.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Attachments: HADOOP-10048.003.patch, HADOOP-10048.patch, HADOOP-10048.trunk.patch
>
>
> As noted in MAPREDUCE-5584 and HADOOP-7016, LocalDirAllocator can be a bottleneck for multithreaded setups like the ShuffleHandler. We should consider moving to a lockless design or minimizing the critical sections to a very small amount of time that does not involve I/O operations.
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