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From Matt Cheah <>
Subject takeSample() computation
Date Thu, 05 Dec 2013 18:13:40 GMT
Hi everyone,

I have a question about RDD.takeSample(). This is an action, not a transformation – but
is any optimization made to reduce the amount of computation that's done, for example only
running the transformations over a smaller subset of the data since only a sample will be
returned as a result?

The context is, I'm trying to measure the amount of time a set of transformations takes on
our dataset without persisting to disk. So I want to stack the operations on the RDD and then
invoke an action that doesn't save the result to disk but can still give me a good idea of
how long transforming the whole dataset takes.


-Matt Cheah

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