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Will increasing the nodes keep on reducing the processing time in cluster?

 
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I have worked on a hadoop cluster which had 3 nodes. When we added 2 more nodes , the processing time reduced. If we add more nodes the processing time will come down.Is there any limit. Will the processing time keep coming down if we keep on increasing the number of nodes to a very high number or will there be a limit beyond which the processing time will stop coming down by increasing the nodes?

thanks

 
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