The heartBeat from the taskTracker to the jobTracker give information about status of the task.
The TaskTracker sends a heart beat to the JobTracker at regular intervals, and also indicates that it can take new tasks for execution.
Then JobTracker consults the Scheduler to assign tasks to the TaskTracker and sends back the list of tasks as the heartbeat response to TaskTracker.
What will happen if JobTracker doesn't recieve any heartbeat ?
It assume that TaskTracker is down and resubmit the corresponding task to other node in the cluster.
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