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From "Vinod K V (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 Wed, 09 Sep 2009 03:47:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752886#action_12752886

Vinod K V commented on MAPREDUCE-958:

Even I thought so, but when I verified it("http://java.sun.com/javase/6/docs/api/java/net/InetAddress.html#isAnyLocalAddress()"),
I realized that this method checks if the InetAddress in a wildcard addresses only and not
the loopback/localhost addresses. So I guess single node clusters will still work fine. Steve?

> 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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