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Posted to mapreduce-issues@hadoop.apache.org by "Varun Saxena (JIRA)" <ji...@apache.org> on 2017/10/21 06:31:00 UTC
[jira] [Updated] (MAPREDUCE-6720) Inconsistent values of counters
across tasks and job reported to timeline service.
[ https://issues.apache.org/jira/browse/MAPREDUCE-6720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Varun Saxena updated MAPREDUCE-6720:
------------------------------------
Fix Version/s: 2.9.0
> 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
> Fix For: 2.9.0, 3.0.0-alpha1
>
> Attachments: Counters For Job.png, Counters for Tasks.png, MAPREDUCE-6720-YARN-2928.01.patch, MAPREDUCE-6720-YARN-2928.02.patch, MAPREDUCE-6720-YARN-2928.03.patch, MAPREDUCE-6720-YARN-2928.04.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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