Would someone explain the exact differences between prefetchSize and
chunkSize and how these interact?  The documentation doesn't really help.

I presume chunkSize is the number of items that get fetched on each RPC to
the datastore backend, equivalent to a fetch() call in python-land.  Is
prefetchSize effectively the same thing as chunkSize but only affects the
first chunk?

Why are these separate parameters?  Under what circumstances would I want
them to be different?

Thanks,
Jeff

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