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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3748) Flag to make tasks to send counter information only at the end of the task
Date Wed, 16 Jul 2008 00:09:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613794#action_12613794
] 

Chris Douglas commented on HADOOP-3748:
---------------------------------------

Have you been able to quantify the impact of counters on either the network traffic or JobTracker
load? If there is a significant impact on either, that seems like sound motivation to repair/improve
the counters, rather than simply providing a means of disabling them.

> 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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