Github user squito commented on the issue:
https://github.com/apache/spark/pull/14079
@kayousterhout @markhamstra @tgravescs @mwws I finally this is ready for
review. I have some minor updates left but I wanted to get this in your hands
now. The main thing is testing on a cluster (would appreciate any input from
you on this as well Tom).
One big change in implementation I'd like to highlight: the
blacklisttracker no longer requires locks. Though its accessed by multiple
threads, its (almost) always from some place in TaskSschedulerImpl, which
already has a lock on the taskScheduler. This also requires expiring executors
while we're doing other work (rather than in a background thread) -- I chose to
do it inside the call to `taskScheduler.resourceOffer`.
The one exception to having a lock on taskScheduler is the YarnBackend --
it needs the full set of blacklisted nodes, and it does that without a lock a
on the task scheduler. But this was pretty easy to workaround.
I'll drop a few inline comments as well.
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