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https://issues.apache.org/jira/browse/HADOOP-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621875#action_12621875
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Owen O'Malley commented on HADOOP-3936:
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This requires more version tolerant rpc. The current version of rpc can't do it
and so this is a big project.
> JobClient should work with -1/+1 version of JobTracker
> ------------------------------------------------------
>
> Key: HADOOP-3936
> URL: https://issues.apache.org/jira/browse/HADOOP-3936
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Environment: all
> Reporter: Alejandro Abdelnur
> Priority: Critical
>
> Currently there is version check on the RPC calls that enforces the same
> Hadoop version on the client and the server.
> To enable phased upgrades of systems using Hadoop and Hadoop itself the
> {{JobClient}} should be able to interact with a {{JobTracker}} of the
> previous and the next version of Hadoop (or with a range).
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