limit row cache size as a proportion of sstable size
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Key: CASSANDRA-3287
URL: https://issues.apache.org/jira/browse/CASSANDRA-3287
Project: Cassandra
Issue Type: Bug
Reporter: Yang Yang
Priority: Minor
I was debugging some problem,
then I found that my memory size increased extremely fast,
and finally reached my old gen total, and then CMS was starting all the time,
back-to-back.
even after I force a full GC, the old gen space is not decreasing any.
so I invoked invalidate cache from jmx, then did GC, now the old gen size went
down.
so it's due to row cache.
but my row cache is really not that big.
then I realized that it's due to too many small sstables. each sstable has the
same size row cache. then for the smaller sstables, it's too favorable: they
have a higher retention ratio, while in fact we can assume that the hit ratio
should be the same for all sstables, particularly if you have a random access
pattern.
if this makes sense, I can put in a simple patch on calling the constructor of
the rowcache
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