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what is JobTracker in Hadoop and what are the actions followed by Hadoop

what is JobTracker in Hadoop and what are the actions followed by Hadoop
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In Hadoop for submitting and tracking MapReduce jobs,  JobTracker is used. Job tracker run on its own JVM process

Hadoop performs following actions in Hadoop

Client application submit jobs to the job tracker and JobTracker communicates to the Namemode to determine data location. Based on available slots the JobTracker locates TaskTracker nodes and chose TaskTracker Nodes and submits the work. When a task fails, Job tracker notify and decides what to do then. The TaskTracker nodes are monitored by JobTracker

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