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https://issues.apache.org/jira/browse/MAPREDUCE-6720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15341331#comment-15341331
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Varun Saxena commented on MAPREDUCE-6720:
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This is not a problem with the co-processor for sure. The flow run coprocessor
is aggregating the app metrics correctly.
I think AM is reporting incorrect values for app though. Probably because
reducer's counters are updated after the data is report to ATS.
I haven't really checked why this is happening as I found this late last night.
Will update if and when I find something.
> Inconsistent values of counters across tasks and job reported to timeline
> service.
> ----------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6720
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6720
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: applicationmaster
> Affects Versions: YARN-2928
> Reporter: Varun Saxena
> Attachments: Counters For Job.png, Counters for Tasks.png
>
>
> While testing found below issue. For some of the task counters, we do not
> have consistent values. This is not the case with every counter though.
> Consider the case of counter
> "org.apache.hadoop.mapreduce.FileSystemCounter:FILE_BYTES_WRITTEN".
> I found that its value for a flow I ran, was 936018 bytes. For the 3 apps
> associated with this flow run, the values were 312006 bytes each (which
> equals to value for a flow run i.e. 3 * 312006 = 936018). Drilling further
> down I found though that for one of the apps, the 4 tasks(2 mappers and 2
> reducers) had values as 155918 bytes each for the 2 reducers and 156003 bytes
> each for the 2 mappers.
> This means the value reported for the app should be (2 * 156003 + 2* 155918)
> or 623842 bytes but it is only 312006 bytes which indicates that only counter
> value of mappers is being picked up.
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