JobClient should work with -1/+1 version of JobTracker
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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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