belugabehr edited a comment on pull request #95:
URL: https://github.com/apache/tez/pull/95#issuecomment-790051560


   Results match my expectations.  If nothing else, Guava uses a `Map` with the 
cached value (as key) and a dummy singleton value. Current implementation uses 
a `Map` with the cached value (as key) and a `new` value.  That'll save some 
memory.


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