[ 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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