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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-844) Metrics messages are sent on a fixed-delay schedule instead of a fixed-rate schedule
Date Fri, 22 Dec 2006 17:39:22 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-844?page=comments#action_12460553 ] 
            
Hadoop QA commented on HADOOP-844:
----------------------------------

+1, because http://issues.apache.org/jira/secure/attachment/12347694/hadoop-844.patch applied
and successfully tested against trunk revision r489489.

> Metrics messages are sent on a fixed-delay schedule instead of a fixed-rate schedule
> ------------------------------------------------------------------------------------
>
>                 Key: HADOOP-844
>                 URL: http://issues.apache.org/jira/browse/HADOOP-844
>             Project: Hadoop
>          Issue Type: Bug
>          Components: metrics
>            Reporter: David Bowen
>            Priority: Minor
>         Attachments: hadoop-844.patch
>
>
> This potentially affects all metrics implementation packages which use a server that
expects data to be sent at a particular rate.  It means that with counter metrics you will
see a spurious periodic dip in the metric, because the rate at which metrics are sent is not
 quite keeping up with what the server expects.
> The fix is trivial.  In org.apache.hadoop.metrics.spi.AbstractMetricsContext, the call
to Timer.schedule should be changes to Timer.scheduleAtFixedRate (which takes the same arguments).

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