David Ribeiro Alves has posted comments on this change.

Change subject: KUDU-1611 - [python] Enable setting scanner selection policy
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Patch Set 2:

This can help, but not totally solve locality. If a scan range is not placed 
near its tablet there is nothing that can be done (which is the locality 
problem we're having with spark). If the ranges are placed co-located with the 
tablets, then locality is already guaranteed, because CLOSEST_REPLICA is the 
default.
What I think would be a better motivation for this patch, is the choice of 
replica type. In order to get RWY the user must use the leader replica now. 
However we would like to make this more of a consistency level thing and not a 
replica choice thing, which brings us back to my previous point.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I09d9cd081c037e3284370943e2cae348476df26c
Gerrit-PatchSet: 2
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Jordan Birdsell <jordantbirds...@gmail.com>
Gerrit-Reviewer: David Ribeiro Alves <dral...@apache.org>
Gerrit-Reviewer: Jordan Birdsell <jordantbirds...@gmail.com>
Gerrit-Reviewer: Kudu Jenkins
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