Github user tnachen commented on the pull request:
https://github.com/apache/spark/pull/3393#issuecomment-64098126
For 3, you are right if the offer is not used it is not acked.
My assumption was that all offers that we accepted based on the conditions
including the ones expanding existing executors are used.
If that is not correct than we need to do what you suggested to have a
local map to see what offers are used by the task scheduler impl.
I need to dig a bit deeper into the spark scheduler more.
@jongyoul i think if @pwendell condition can be true your fix needs to
account that as well, sorry for the confusion
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