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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1477) Number of free slots on TaskTracker are calculated differently by JobTracker and TaskTracker
Date Wed, 10 Feb 2010 11:06:27 GMT
Number of free slots on TaskTracker are calculated differently by JobTracker and TaskTracker
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                 Key: MAPREDUCE-1477
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1477
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker, tasktracker
            Reporter: Amareshwari Sriramadasu


Currently number of free slots of TaskTracker come from different sources on JobTracker and
TaskTracker. JobTracker iterates through TaskReports in TaskTrackerStatus and finds out how
many slots are free, where as TaskTracker keeps it as a number. 
We saw some situations where these values could be different (when bugs like MAPREDUCE-1475
were hit).

To make it a single source, I think TaskTracker should send number of free slots also in the
heartbeat.

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