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https://issues.apache.org/jira/browse/HADOOP-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12476363
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Doug Cutting commented on HADOOP-1048:
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It might also be interesting to profile the counter code. I wonder how much
faster it would be if instead of a Map<String,Long> we used a
Map<String,CounterValue> where CounterValue is defined as something like:
private class CounterValue { long value; }
Then incrementing the value would not require creating a new Long instance.
> Sort500 failing since counters patch went in
> --------------------------------------------
>
> Key: HADOOP-1048
> URL: https://issues.apache.org/jira/browse/HADOOP-1048
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Reporter: David Bowen
>
> Nigel wrote:
> We have a problem
> Looks like counters patch is "breaking" things
> Sort500 has been failing since the patch went in
> Looking at the JT logs, there are 0 "Call queue overflow" message before
> the patch went in and 15000+ after the patch went in
> Looks like the counters stuff is overwhelming the JT
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