batchSize vs limit

[Dustin Norlander]

Sorry if this has been answered elsewhere, I've searched through the
list and docs and not found much.

I had assumed batchSize was the number of objects downloaded from the
server in a single batch (to avoid tons of synchronous requests). But
it seems to also set the 'limit' param.

the code in question (java):

cur.batchSize(500);
cur.limit(1000);
while(cur.hasNext()) {
DBObject obj = cur.next()
//do something
}

In this example I only get 500 results back. Easy enough fix is to
set batchSize = limit. I'm just confused as to the logic.

[Eliot Horowitz]

You're understanding is correct.
You should get 1000 results in 2 batches of 500 (internally)

There is in fact a unit test exactly for that
http://github.com/mongodb/mongo-java-driver/blob/master/src/test/com/mongodb/DBCursorTest.java#L153-162

If you can provide a full example that fails, can take a look.

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