nyl3532016 commented on pull request #2018:
URL: https://github.com/apache/hbase/pull/2018#issuecomment-657186954


   > I wonder do we still need the testSizes method in TestHeapSize after this 
change? And we need a performance test to see if there are any impact on 
performance(although I believe no)
   Yes, this change only affect class loading phase. And the calculation of 
FIXED_OVERHEAD cost less than 5 milliseconds


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