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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-91) snapshot a map-reduce to DFS ... and restore
Date Fri, 17 Mar 2006 04:27:11 GMT
snapshot a map-reduce to DFS ... and restore
--------------------------------------------

         Key: HADOOP-91
         URL: http://issues.apache.org/jira/browse/HADOOP-91
     Project: Hadoop
        Type: New Feature
  Components: mapred  
    Reporter: eric baldeschwieler
    Priority: Minor


The idea is to be able to issue a command to the job tracker that
will halt a map-reduce and archive it to a directory in such a way
that it can later be restarted.

We could also set a mode that would cause this to happen to a job
when it fails.  This would allow one to debug and restart a failing
job reasonably, which might be important, for long running jobs.  It
has certainly been important in similar systems I've seen before.  One 
could restart with a new jar or work bench a single failing map or reduce.


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