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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