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https://issues.apache.org/jira/browse/HDFS-5336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792365#comment-13792365
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Chris Nauroth commented on HDFS-5336:
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This is caused by reliance on static initialization coming back to bite us.
The startup progress metrics get registered during static initialization of the
{{NameNode}} class. Any process accessing that class will register the startup
progress metrics as a side effect. For example, {{DatanodeWebHdfsMethods}}
calls {{NameNode#getHttpAddress}}. I don't know yet how the YARN code
triggered it.
> DataNode should not output 'StartupProgress' metrics
> ----------------------------------------------------
>
> Key: HDFS-5336
> URL: https://issues.apache.org/jira/browse/HDFS-5336
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.1.0-beta
> Environment: trunk
> Reporter: Akira AJISAKA
> Assignee: Akira AJISAKA
> Priority: Minor
> Labels: metrics
>
> I found the following metrics output from DataNode.
> {code}
> 1381355455731 default.StartupProgress: Hostname=trunk, ElapsedTime=0,
> PercentComplete=0.0, LoadingFsImageCount=0, LoadingFsImageElapsedTime=0,
> LoadingFsImageTotal=0, LoadingFsImagePercentComplete=0.0,
> LoadingEditsCount=0, LoadingEditsElapsedTime=0, LoadingEditsTotal=0,
> LoadingEditsPercentComplete=0.0, SavingCheckpointCount=0,
> SavingCheckpointElapsedTime=0, SavingCheckpointTotal=0,
> SavingCheckpointPercentComplete=0.0, SafeModeCount=0, SafeModeElapsedTime=0,
> SafeModeTotal=0, SafeModePercentComplete=0.0
> {code}
> DataNode should not output 'StartupProgress' metrics because the metrics
> shows the progress of NameNode startup.
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