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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5185) Upate thread in FairScheduler runs too frequently
Date Fri, 20 Mar 2009 00:17:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683691#action_12683691
] 

Matei Zaharia commented on HADOOP-5185:
---------------------------------------

Is anyone from Yahoo working on this? It's pretty straightforward to add a config option.

> Upate thread in FairScheduler runs too frequently
> -------------------------------------------------
>
>                 Key: HADOOP-5185
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5185
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/fair-share
>            Reporter: Vinod K V
>
> The UpdateThread in FairScheduler runs every 500ms (hardcoded). This proves to be very
costly when running large clusters. UpdateThread tries to acquire lock on JT object every
that often and so seriously affects HeartBeat processing besides everything else. The update
interval should be a function of the cluster size. Or in the minimum it should be configurable
and by default should be set to a reasonably high default value.

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