Found this
http://stackoverflow.com/questions/6914069/google-app-engine-chunksize-prefetchsize-where-can-i-read-details-on-it

On Sun, Nov 20, 2011 at 8:27 AM, Max <thebb...@gmail.com> wrote:

> +1
>
> I am also curious on the answer. I found following code snippet in class
> QueryTranslator, it looks to some degree these two are the same and
> prefetchSize overrides chunkSize?
>
>     DatastorePb.Query proto = new DatastorePb.Query();
>
>     if (fetchOptions.getPrefetchSize() != null) {
>       proto.setCount(fetchOptions.getPrefetchSize());
>     } else if (fetchOptions.getChunkSize() != null) {
>       proto.setCount(fetchOptions.getChunkSize());
>     }
>
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