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From "Yu Sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16300) LruBlockCache.CACHE_FIXED_OVERHEAD should calculate LruBlockCache size correctly
Date Thu, 28 Jul 2016 18:52:20 GMT
Yu Sun created HBASE-16300:
------------------------------

             Summary: LruBlockCache.CACHE_FIXED_OVERHEAD should calculate LruBlockCache size
correctly
                 Key: HBASE-16300
                 URL: https://issues.apache.org/jira/browse/HBASE-16300
             Project: HBase
          Issue Type: Bug
            Reporter: Yu Sun
            Assignee: Yu Sun


in current master {{LruBlockCache}},  CACHE_FIXED_OVERHEAD is calculated as this:
{code}
  public final static long CACHE_FIXED_OVERHEAD = ClassSize.align(
      (3 * Bytes.SIZEOF_LONG) + (10 * ClassSize.REFERENCE) +
      (5 * Bytes.SIZEOF_FLOAT) + (2 * Bytes.SIZEOF_BOOLEAN)
      + ClassSize.OBJECT);
{code}

after some investigation. I think there are some wrong here, {{class LruBlockCache}}, except
static varible(which is belongs to class), there are 4 long varibles(maxBlockSize,maxSize,blockSize
and overhead), 9 reference varibles and 2 boolean varibles, so the above code will not calculate
LruBlockCache instance size correctly.



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