[jira] [Resolved] (MAPREDUCE-6978) MR task counters deserialized through RPC throws OutOfBoundsException if Counter enum class version not match

["Jason Lowe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Lowe resolved MAPREDUCE-6978.
-----------------------------------
    Resolution: Duplicate

> MR task counters deserialized through RPC throws OutOfBoundsException if Counter enum class version not match
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6978
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6978
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mr-am, task
>    Affects Versions: 3.0.0-alpha4
>         Environment: NM1 TaskCounter.class old version; 
> NM2 TaskCounter.class new version (new Enumeration values appended); 
>            Reporter: rangjiaheng
>
> Environment:
> NM1 TaskCounter.class old version; 
> NM2 TaskCounter.class new version (new Enumeration values appended); 
> Result:
> When an MR app's AM running on NM1, and it's containers on NM2; the containers on NM2 will all failed, AM cause OutOfBoundsException;
> Reason:
> When app running, containers will report their counters to AM through RPC, while the Container with new version TaskCounter.class will write more Counter values to RPC; however, the AM with old version TaskCounter.class which can not read them correctly from RPC.



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