Sorry aaron, here are the values you requested RecentBloomFilterFalsePositives = 5; BloomFilterFalsePositives = 385260;
uptime of the node is three days and a half, more or less El mié, 11-05-2011 a las 22:05 +1200, aaron morton escribió: > What are the values for RecentBloomFilterFalsePositives and > BloomFilterFalsePositives the non ratio ones ? > > ----------------- > Aaron Morton > Freelance Cassandra Developer > @aaronmorton > http://www.thelastpickle.com > > On 11 May 2011, at 19:53, Héctor Izquierdo Seliva wrote: > > > El mié, 11-05-2011 a las 14:24 +1200, aaron morton escribió: > >> 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. > >> > >> Cheers > > > > 0.7.5, and I am no longer using key cache. I get the bloom filter stats > > via jmx. BloomFilterFalsePositiveRatio is always stuck at 1.0. > > RecentBloomFilterFalsePositiveRation fluctuates from 0 to 1.0 with no > > intermediate values. > > > > As for the index interval settings, I changed it from 128 to 256 and > > memory consumption was just a tad lower but read performance was worse > > by a few ms, so not much to gain there. > > > >> ----------------- > >> Aaron Morton > >> Freelance Cassandra Developer > >> @aaronmorton > >> http://www.thelastpickle.com > >> > >> On 11 May 2011, at 10:38, Chris Burroughs wrote: > >> > >>> On 05/10/2011 02:12 PM, Peter Schuller wrote: > >>>>> That reminds me, my false positive ration is stuck at 1.0, so I guess > >>>>> bloom filters aren't doing a lot for me. > >>>> > >>>> That sounds unlikely unless you're hitting some edge case like reading > >>>> a particular row that happened to be a collision, and only that row. > >>>> This is from JMX stats on the column family store? > >>>> > >>> > >>> (From jmx) I also see BloomFilterFalseRatio stuck at 1.0 on my > >>> production nodes. The only values that RecentBloomFilterFalseRatio had > >>> over the past several minutes were 0.0 and 1.0. While I can't prove > >>> that isn't accurate, it is very suspicions. > >>> > >>> The code looked reasonable until I got to SSTableReader, which was too > >>> complicated to just glance through. > >> > > > > >
