How and where is input split size mentioned or passed to a MR program?

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I understand what input split size and what a block size means. But what I am trying to understand is where and how the input split size is mentioned for a MR program... is it passed a parameter while starting a MR job using (Hadoop jar MRPROGRAM ... etc) or is it specified in the MR Job configuration program or is it mentioned some where else. Please explain.

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