Metrics messages are sent on a fixed-delay schedule instead of a fixed-rate
schedule
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Key: HADOOP-844
URL: http://issues.apache.org/jira/browse/HADOOP-844
Project: Hadoop
Issue Type: Bug
Components: metrics
Reporter: David Bowen
Priority: Minor
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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