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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12975) Add jitter to CachingGetSpaceUsed's thread
Date Thu, 12 May 2016 16:47:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281731#comment-15281731
] 

Colin Patrick McCabe commented on HADOOP-12975:
-----------------------------------------------

Thanks, [~eclark].  +1 pending jenkins

> Add jitter to CachingGetSpaceUsed's thread
> ------------------------------------------
>
>                 Key: HADOOP-12975
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12975
>             Project: Hadoop Common
>          Issue Type: Sub-task
>    Affects Versions: 2.9.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>         Attachments: HADOOP-12975v0.patch, HADOOP-12975v1.patch, HADOOP-12975v2.patch,
HADOOP-12975v3.patch, HADOOP-12975v4.patch, HADOOP-12975v5.patch, HADOOP-12975v6.patch
>
>
> Running DU across lots of disks is very expensive and running all of the processes at
the same time creates a noticeable IO spike. We should add some jitter.



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