[ http://issues.apache.org/jira/browse/HADOOP-844?page=all ]
Doug Cutting updated HADOOP-844:
--------------------------------
Status: Patch Available (was: Open)
> 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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