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https://issues.apache.org/jira/browse/HADOOP-4766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661988#action_12661988
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Devaraj Das commented on HADOOP-4766:
-------------------------------------
+1 (though I should note that the policy for purging a completed job can be
tweaked to take into account the user factor, for example, purge the oldest
completed jobs in a round robin fashion on a per user basis). But this patch is
good for now.
> Hadoop performance degrades significantly as more and more jobs complete
> ------------------------------------------------------------------------
>
> Key: HADOOP-4766
> URL: https://issues.apache.org/jira/browse/HADOOP-4766
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.18.2, 0.19.0
> Reporter: Runping Qi
> Assignee: Amar Kamat
> Priority: Blocker
> Fix For: 0.18.3, 0.19.1, 0.20.0
>
> Attachments: HADOOP-4766-v1.patch, HADOOP-4766-v2.4.patch,
> HADOOP-4766-v2.6.patch, HADOOP-4766-v2.7-0.18.patch,
> HADOOP-4766-v2.7-0.19.patch, HADOOP-4766-v2.7.patch,
> HADOOP-4766-v2.8-0.18.patch, HADOOP-4766-v2.8-0.19.patch,
> HADOOP-4766-v2.8.patch, map_scheduling_rate.txt
>
>
> When I ran the gridmix 2 benchmark load on a fresh cluster of 500 nodes with
> hadoop trunk,
> the gridmix load, consisting of 202 map/reduce jobs of various sizes,
> completed in 32 minutes.
> Then I ran the same set of the jobs on the same cluster, yhey completed in 43
> minutes.
> When I ran them the third times, it took (almost) forever --- the job tracker
> became non-responsive.
> The job tracker's heap size was set to 2GB.
> The cluster is configured to keep up to 500 jobs in memory.
> The job tracker kept one cpu busy all the time. Look like it was due to GC.
> I believe the release 0.18/0.19 have the similar behavior.
> I believe 0.18 and 0.18 also have the similar behavior.
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