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Posted to yarn-issues@hadoop.apache.org by "Daniel Templeton (JIRA)" <ji...@apache.org> on 2016/03/12 01:08:52 UTC

[jira] [Created] (YARN-4795) ContainerMetrics drops records

Daniel Templeton created YARN-4795:
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             Summary: ContainerMetrics drops records
                 Key: YARN-4795
                 URL: https://issues.apache.org/jira/browse/YARN-4795
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 2.9.0
            Reporter: Daniel Templeton
            Assignee: Daniel Templeton


The metrics2 system was implemented to deal with persistent sources.  {{ContainerMetrics}} is an ephemeral source, and so it causes problems.  Specifically, the {{ContainerMetrics}} only reports metrics once after the container has been stopped.  This behavior is a problem because the metrics2 system can ask sources for reports that will be quietly dropped by the sinks that care.  (It's a metrics2 feature, not a bug.)  If that final report is silently dropped, it's lost, because the {{ContainerMetrics}} won't report anything else ever anymore.



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