Erik Krogen created HADOOP-15008:
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Summary: Metrics sinks may emit too frequently if multiple sink
periods are configured
Key: HADOOP-15008
URL: https://issues.apache.org/jira/browse/HADOOP-15008
Project: Hadoop Common
Issue Type: Bug
Components: metrics
Reporter: Erik Krogen
Assignee: Erik Krogen
Priority: Minor
If there are multiple metrics sink periods configured, depending on what those
periods are, some sinks may emit too frequently. For example with the following:
{code:title=hadoop-metrics2.properties}
namenode.sink.file10.class=org.apache.hadoop.metrics2.sink.FileSink
namenode.sink.file5.class=org.apache.hadoop.metrics2.sink.FileSink
namenode.sink.file10.filename=namenode-metrics_per10.out
namenode.sink.file5.filename=namenode-metrics_per5.out
namenode.sink.file10.period=10
namenode.sink.file5.period=5
{code}
I get the following:
{code}
± for f in namenode-metrics_per*.out; do echo "$f" && grep
"metricssystem.MetricsSystem" $f | awk '{last=curr; curr=$1} END { print
curr-last }'; done
namenode-metrics_per10.out
5000
namenode-metrics_per5.out
5000
{code}
i.e., for both metrics files, each record is 5000 ms apart, even though one of
the sinks has been configured to emit at 10s intervals
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