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https://issues.apache.org/jira/browse/HADOOP-1485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12507903
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David Bowen commented on HADOOP-1485:
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Please scratch my comment above about moving the update calls outside of the
sync blocks. That is a pattern that works in other places, where we are using
a timer-callback to do the update (so only the timer thread calls update). But
in this case, multilple threads are calling update, so it is necessary to keep
the updates inside the sync blocks. My apologies for giving bad advice.
> Metrics should be there for reporting shuffle failures/successes
> ----------------------------------------------------------------
>
> Key: HADOOP-1485
> URL: https://issues.apache.org/jira/browse/HADOOP-1485
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Devaraj Das
> Fix For: 0.14.0
>
> Attachments: 1485.1.patch, 1485.1.patch, shuffle-metrics.patch
>
>
> It would be nice to have metrics for the shuffle phase which reports the
> failures/successes for the fetches. This would aid in performance tests and
> in debugging (shuffle).
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