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https://issues.apache.org/jira/browse/HADOOP-3748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12626650#action_12626650
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Runping Qi commented on HADOOP-3748:
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I think we need to be more pragmatic about performance related contributions.
I think any improvement is worth to consider. It is reasonable that we weight
performance improvement brought in by a patch against the additional code
complexity it introduces.
However, it is too strong to state that such a patch will not be committed
unless it brought significant performance gain.
BTW, how do you characterize significant performance gain?
> Flag to make tasks to send counter information only at the end of the task
> --------------------------------------------------------------------------
>
> Key: HADOOP-3748
> URL: https://issues.apache.org/jira/browse/HADOOP-3748
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Environment: all
> Reporter: Alejandro Abdelnur
>
> Currently counters are streaming from the task to the jobtracker as the task
> progresses. If the number of counters is large this has a significant impact
> on the network traffic as well as in the JobTracker load.
> The should be a flag, for example by counter-group, that indicates that the
> counters are to be reported at the end of the task. By default this flag
> should be set to false for all counter-groups maintaining the current
> behavior.
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