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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5203) TT's version build is too restrictive
Date Tue, 10 Feb 2009 15:27:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672292#action_12672292

Runping Qi commented on HADOOP-5203:

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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