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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-958) TT should bail out early when mapred.job.tracker is bound to 0:0:0:0
Date Tue, 08 Sep 2009 17:29:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752622#action_12752622
] 

Allen Wittenauer commented on MAPREDUCE-958:
--------------------------------------------

I'm likely misunderstanding, but won't this prevent hadoop working on machines with only a
loopback?  [I'm thinking primarily of single node clusters on laptops on an airplane.]  It
would also be interesting to see how Solaris Zones would interpret this changes.

> TT should bail out early when mapred.job.tracker is bound to 0:0:0:0
> --------------------------------------------------------------------
>
>                 Key: MAPREDUCE-958
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-958
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.21.0
>            Reporter: Steve Loughran
>
> It's OK for your job tracker's config to tells the JobTracker to come up on port 0:0:0:0,
but its not OK for the TaskTrackers to get the same mapred.job.tracker configuration value,
as it stops the TT from being able to report its heartbeat.
> This misconfiguration surfaces in the TT's {{offerService()}} routine catching and logging
a ConnectionRefused exception every time it tries to heartbeat. Now we have improved the error
message in such a situation, it is still a bit late in the process to encounter a problem
which should be obvious the moment the TT looks at its configuration.
> Better to have the TT refuse to start up if {{jobTrackAddr.getAddress().isAnyLocalAddress()}}.


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