Github user keith-turner commented on the pull request:
https://github.com/apache/accumulo/pull/25#issuecomment-91038638
> Agreed, but is this a new issue?
I think the intent of this PR is new. I think the intent is to efficiently
support a map reduce job that reads from many small ranges. If we are going to
do that, then lets do it in a way that scales better.
> However, I still think that for many things, it's probably better to
simply use an iterator with some filter criteria.
This approach would work well for existing input format. The only drawback
to this approach is it requires adding custom iterators to tservers classpaths.
The batch scanner approach allows efficient reads of many small ranges from a
tablet w/o custom iterators. Just need a custom function in the map reduce job
to generate the ranges.
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