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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15008) Metrics sinks may emit too frequently if multiple sink periods are configured
Date Fri, 10 Nov 2017 16:17:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247725#comment-16247725
] 

Erik Krogen commented on HADOOP-15008:
--------------------------------------

[~eyang] any chance you can help review?

> 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
>         Attachments: HADOOP-15008.000.patch
>
>
> 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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