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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6720) Inconsistent values of counters across tasks and job reported to timeline service.
Date Tue, 21 Jun 2016 16:34:58 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15342112#comment-15342112

Varun Saxena commented on MAPREDUCE-6720:

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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