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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3936) JobClient should work with -1/+1 version of JobTracker
Date Tue, 12 Aug 2008 11:24:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621776#action_12621776
] 

Alejandro Abdelnur commented on HADOOP-3936:
--------------------------------------------

This could be done by either allowing a range version of clients on the {{JobTracker}}, or
having an HTTP transport with potentially reduced functionality (like the HDFS over HTTP).



> 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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