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https://issues.apache.org/jira/browse/MAPREDUCE-6979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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rangjiaheng resolved MAPREDUCE-6979.
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Resolution: Duplicate
> CLONE - MR task counters deserialized through RPC throws OutOfBoundsException
> if Counter enum class version not match
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6979
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6979
> 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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