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https://issues.apache.org/jira/browse/MAPREDUCE-6720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15342112#comment-15342112
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Varun Saxena commented on MAPREDUCE-6720:
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I am fine with reporting Map and reduce counter values separately as well. But
this will increase the number of metrics being stored to upto 2 times.
If we see a use case and have consensus on it, we can probably append _MAP or
_REDUCE to the counter group name as that can help us filter out certain
metrics based on prefix (we can specify prefixes in metricstoretrieve)
> 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
> Assignee: Varun Saxena
> Labels: yarn-2928-1st-milestone
> Attachments: Counters For Job.png, Counters for Tasks.png,
> MAPREDUCE-6720-YARN-2928.01.patch
>
>
> 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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