Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/3399#issuecomment-64237403
@srowen @witgo The mini-batch implementation is not efficient because every
mini-batch needs a pass to the data. As a result, it may not be useful if
`miniBatchFraction` is set to a very small number.
@witgo Shall we throw a warning message if the batch size is zero?
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