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Hadoop >> mail # user >> MR job scheduler

Hi all,

Can anyone tell me how the MR scheduler schedule the MR jobs?
How does it decide where t create MAP tasks and how many to create.
Once the MAP tasks are over how does it decide to move the keys to the
reducer efficiently(minimizing the data movement across the network).
Is there any doc available which describes this scheduling process quite

Kindly respond to this mail.

Thanks in advance.