Priya

[Priya]

MapReduce has 2 key components:
Job Tracker:
Coordinates all the jobs run on the system by scheduling tasks
Keeps a record of overall progress of each job
If a job fails, reschedules the job on a different tasktracker

Task Tracker:
Slave daemon which accepts tasks to be run a block of data
Sends progress reports as heart beat signals to the Job tracker at regular intervals

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