mapReduce – rent cloud resources#IaaS

MR is popular on clouds — offered by AWS/Azure/Google.

I used to question the validity of on-demand/rent proposition. I felt during a peak period everyone is busy and in an off-peak period everyone has low volume. Now I think Hadoop is a nice example. 
It often runs for a short time but involves many compute nodes. This could be in a off-peak period. Without cloud, the Hadoop will have to make do with much fewer compute nodes.
Further, any batch job in general could be scheduled off-peak. 

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