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https://issues.apache.org/jira/browse/HADOOP-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602174#action_12602174
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Sharad Agarwal commented on HADOOP-236:
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Not included any test case as it is difficult to write for this functionality.
> job tracker should refuse connection from a task tracker with a different
> version number
> ----------------------------------------------------------------------------------------
>
> Key: HADOOP-236
> URL: https://issues.apache.org/jira/browse/HADOOP-236
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.2.1
> Reporter: Hairong Kuang
> Assignee: Sharad Agarwal
> Fix For: 0.18.0
>
> Attachments: 236_v1.patch
>
>
> After one mapred system upgrade, we noticed that all tasks assigned to one
> task tracker failed. It turned out that for some reason the task tracker was
> not upgraded.
> To avoid this, a task tracker should reports its version # when it registers
> itsself with a job tracker. If the job tracker receives an inconsistent
> version #, it should refuse the connection.
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