Github user squito commented on the pull request:
https://github.com/apache/spark/pull/8760#issuecomment-220069649
Hi everyone, sorry this has sat around for so long, but this is a super
important feature, so I'd like to finish up the missing pieces and get this in
(with credit to @mwws still, of course). Other than just fixing merge
conflicts, it seems there are two things which need to be addressed: (1)
addressing performance concerns with some profiling and (2) investigating a
lock-free implementation (think this can be done but need to look more
carefully). I'll also build on the tests introduced here
https://github.com/apache/spark/pull/8559.
I'll open a WIP pr in the next day or two at least, but please let me know
if I'm missing any major concern.
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