[jira] [Created] (MAPREDUCE-6925) CLONE - Make Counter limits consistent across JobClient, MRAppMaster, and YarnChild

["Junping Du (JIRA)" <ji...@apache.org>]

Junping Du created MAPREDUCE-6925:
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             Summary: CLONE - Make Counter limits consistent across JobClient, MRAppMaster, and YarnChild
                 Key: MAPREDUCE-6925
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6925
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: applicationmaster, client, task
    Affects Versions: 2.4.0
            Reporter: Gera Shegalov
            Assignee: Gera Shegalov
             Fix For: 2.9.0, 3.0.0-alpha1


Currently, counter limits "mapreduce.job.counters.*" handled by {{org.apache.hadoop.mapreduce.counters.Limits}} are initialized asymmetrically: on the client side, and on the AM, job.xml is ignored whereas it's taken into account in YarnChild.

It would be good to make the Limits job-configurable, such that max counters/groups is only increased when needed. With the current Limits implementation relying on static constants, it's going to be challenging for tools that submit jobs concurrently  without resorting to class loading isolation.

The patch that I am uploading is not perfect but demonstrates the issue. 



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