For smaller distcp jobs, I think setup time on dynamic strategy will be longer than for the uniform size strategy. And if all maps are running at similar speeds, then you won't gain much using dynamic strategy and lose the setup time. However, not all maps run at similar speeds. With dynamic strategy, slower running maps will get to process less data and faster running maps process more data. I haven't got the exact amount of data where one works better than other, but in general on larger datasets and on heterogenous cluster (not all workers are same hardware), dynamic strategy has advantage.
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