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https://issues.apache.org/jira/browse/HADOOP-3748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628456#action_12628456
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Doug Cutting commented on HADOOP-3748:
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If processing counters ever becomes a significant significant burden on the JT,
then we should automatically transmit them less frequently, degenerating to
once per task completion for short-lived tasks, rather than forcing
applications to explicitly set (yet another) configuration parameter.
> 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
> Attachments: [HADOOP-3748].patch
>
>
> 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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