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https://issues.apache.org/jira/browse/HADOOP-8968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13484242#comment-13484242
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Harsh J commented on HADOOP-8968:
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I just went through these and the code plus tests look fine to me. +1.
I understand that such a change isn't exactly required on the trunk-end, as we
no longer utilize Hadoop-RPC there.
> add flag to disable completely version check in the TaskTracker and DataNode
> ----------------------------------------------------------------------------
>
> Key: HADOOP-8968
> URL: https://issues.apache.org/jira/browse/HADOOP-8968
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Alejandro Abdelnur
> Assignee: Alejandro Abdelnur
> Fix For: 1.2.0
>
> Attachments: HADOOP-8968.patch, HADOOP-8968.patch
>
>
> The current logic in the TaskTracker and the DataNode to allow a relax
> version check with the JobTracker and NameNode works only if the versions of
> Hadoop are exactly the same.
> We should add a switch to disable version checking completely, to enable
> rolling upgrades between compatible versions (typically patch versions).
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