Github user HeartSaVioR commented on the issue:
https://github.com/apache/storm/pull/1783
I agree it's still better to not relying on Guava since storm-core is
shading Guava but external modules are not.
Btw, I didn't use other cache modules too, but ehcache seems to be
well-known and widely-used cache library, and Caffeine seems to be a drop-in
replacement for Guava cache.
@ben-manes I guess you're the author of Caffeine. Could you introduce
Caffeine?
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