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Can anyone explain what is JobTracker in Hadoop?

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In Hadoop, the task of the task tracker is to send out heartbeat pings to the Jobtracker after a few minutes or so. This is done to ensure if the JobTracker is running and active. This heartbeat ping also conveys to the JobTracker the number of available slots. Based on the slot information, the JobTracker to appropriately schedule workload.       

If you are looking for an online course to learn Hadoop, check out this Hadoop Certification by Intellipaat.

You can watch this YouTube tutorial on Hadoop to get started:

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