aratno opened a new pull request, #2962:
URL: https://github.com/apache/cassandra/pull/2962

   Fix re-wrapping of TableMetadataRefCache fields in 
Collections.UnmodifiableMap, which was causing long reference chains where the 
underlying map was another instance of an UnmodifiableMap. Calls to `get` had 
to traverse all the way down the chain, and would eventually overflow the stack 
(and created a fair bit of extra garbage on the heap).


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