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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8617) Throttle DiskChecker#checkDirs() speed.
Date Thu, 25 Aug 2016 07:47:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15436437#comment-15436437
] 

Arpit Agarwal commented on HDFS-8617:
-------------------------------------

I believe this is a duplicate of HDFS-8845. 

> Throttle DiskChecker#checkDirs() speed.
> ---------------------------------------
>
>                 Key: HDFS-8617
>                 URL: https://issues.apache.org/jira/browse/HDFS-8617
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: HDFS-8617.000.patch
>
>
> As described in HDFS-8564,  {{DiskChecker.checkDirs(finalizedDir)}} is causing excessive
I/Os because {{finalizedDirs}} might have up to 64K sub-directories (HDFS-6482).
> This patch proposes to limit the rate of IO operations in {{DiskChecker.checkDirs()}}.




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