Github user hhbyyh commented on the pull request:
https://github.com/apache/spark/pull/4200#issuecomment-71442052
Well, a clear problem for current `auto` mode is it will choose local mode
as long as k > n / 2, regardless of matrix scale
I've not fully evaluated the capacity and constraints of LocalARPACK and
DistARPACK, (like whether or not DistARPACK will be better), and until then,
rewriting `auto` seems rash.
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