Thanks A ----------------- Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com
On 12 May 2011, at 03:44, Jonathan Ellis wrote: > Close: the problem is we don't count *any* true positives *unless* > cache is enabled. > > Fix attached to https://issues.apache.org/jira/browse/CASSANDRA-2637. > > On Wed, May 11, 2011 at 7:04 AM, Chris Burroughs > <chris.burrou...@gmail.com> wrote: >> On 05/10/2011 10:24 PM, aaron morton wrote: >>> What version and what were the values for RecentBloomFilterFalsePositives >>> and BloomFilterFalsePositives ? >>> >>> The bloom filter metrics are updated in SSTableReader.getPosition() the >>> only slightly odd thing I can see is that we do not count a key cache hit a >>> a true positive for the bloom filter. If there were a lot of key cache hits >>> and a few false positives the ratio would be wrong. I'll ask around, does >>> not seem to apply to Hectors case though. >> >> 0.7.1 No key cache. >> >> BloomFilterFalsePositives: 48130 >> Read Count: 153973494 >> RecentBloomFilterFalsePositives: 4, 1, 2, 0, 0, 1 >> > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of DataStax, the source for professional Cassandra support > http://www.datastax.com
