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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5185) Upate thread in FairScheduler runs too frequently
Date Fri, 06 Feb 2009 09:39:59 GMT
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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