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https://issues.apache.org/jira/browse/HADOOP-5203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672292#action_12672292
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Runping Qi commented on HADOOP-5203:
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Well, this is a bad feature:)
Here is a situation one may face. Say you have a cluster with different
machines, say some are 32 bits and others are 64 bits.
One needs to build Hadoop need on different machines. It is almost impossible
to have the builds happen at the exact same time.
Thus, with tgis feature, it is almost impossible to deploy Hadoop on this kind
of environment.
Also, suppose you discover some problems with TT and you want to go ahead to
fix it and build a reease. You don't want to shut down the job tracker. But
with this feature, you cannot deploy the task trackers without shutting down
the job tracker.
> TT's version build is too restrictive
> -------------------------------------
>
> Key: HADOOP-5203
> URL: https://issues.apache.org/jira/browse/HADOOP-5203
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Runping Qi
>
> At start time, TT checks whether its version is compatible with JT.
> The condition is too restrictive.
> It will shut down itself if one of the following conditions fail:
> * the version numbers must match
> * the revision numbers must match
> * the user ids who build the jar must match
> * the build times must match
> I think it should check the major part of the version numbers only (thus any
> version like 0.19.xxxx should be compatible).
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