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From "Mahadev Konar" <maha...@yahoo-inc.com>
Subject RE: Classes Not Loading Correctly in MapRed 0.7
Date Tue, 17 Oct 2006 17:33:38 GMT
Hi Albert,
   There has been a critical bug in 0.7 release. The bug and the patch are
avalaible at https://issues.apache.org/jira/browse/HADOOP-607. There should
be a release soon fixing this problem.


> -----Original Message-----
> From: Albert Chern [mailto:albert.chern@gmail.com]
> Sent: Thursday, October 12, 2006 7:44 PM
> To: hadoop-user@lucene.apache.org
> Subject: Classes Not Loading Correctly in MapRed 0.7
> Hello,
> After upgrading from 0.6 to 0.7, we have experienced a strange error
> with MapReduce jobs.  Jobs that ran perfectly before now seem to have
> trouble finding the classes from our code.  The stack trace is long,
> but the errors happen in MapTask.run() when it tries to get the map
> output key class from the JobConf, which is probably the first time
> any of our classes are loaded.  Then it fails with a
> ClassNotFoundException.
> The strange thing is, the error does not occur on all of the machines
> in the cluster.  As far as we can tell, the Hadoop installation and
> configuration are the same across the machines.  Downgrading to 0.6
> fixes the problem.  Has anyone experienced something similar, or have
> any idea what could be causing this problem?  Something incorrectly
> configured, maybe?
> Thanks,
> Albert

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