smolnar82 commented on pull request #490:
URL: https://github.com/apache/knox/pull/490#issuecomment-915837967


   > > I'd the idea of replacing the current `ConcurrentHashMap` caches into 
`Caffeine.Cache` instances but we would still have an issue with eventual 
consistency within the configured entry TTL in those caches ("margin of 
error"). I discussed this approach with @zeroflag and we felt that it'd be 
pre-mature optimization that can be added later if we hit any performance 
issues. On the other hand, I'm open to re-evaluate that area if we insist this 
has to be done now.
   > 
   > I see, I am cool with it knowing this has been discussed and will be 
addressed in the future patches :)
   > Thanks!
   
   https://issues.apache.org/jira/browse/KNOX-2660


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