Yu Sun created HBASE-16300:
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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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