Github user revans2 commented on the issue:
https://github.com/apache/storm/pull/1783
Caffeine sounds like a great alternative to Guava and also seems to address
some GC concerns.
@vesense I agree storing any large amount of data on heap will impact GC,
we do that all the time with all of the queues that we have. I think for the
most part as long as GC is tuned properly for the topology, we don't get a lot
of full GCs causing promotion in the cache, and TTL in the cache is not too
long it will be fine. If we do run into serious GC issues we can then look at
off heap cacheing.
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