Hi, The number of false positives may be increasing because more filters are being consulted on each query. The number of filters consulted on each query is a function of number of sstables consulted. You may be seeing an increase in number of tables consulted if compaction is falling behind. I'm not an expert on the operational playbook for compaction falling behind, but you can change the compaction throttle, disable gossip so compaction can catch up (this can go wrong), add capacity by adding nodes. If it's just one node you may also want to look into why that node is a hot spot. Is there a single large partition that could be causing issues? Ariel
On Mon, Jul 3, 2017, at 09:55 AM, Jean Carlo wrote: > Hello > Lately I am observing that the false positives of one of my nodes are > increasing in a continous way (1 per 5min)> > Bloom filter false positives: 532 > Bloom filter false ratio: 0.01449 > Bloom filter space used: 1.34 MB > Bloom filter off heap memory used: 1.33 MB > At the same time I can see that the duration of GC has increased also> > There is a link between the increasment of the GC and the bloom > filter ?> > Jean Carlo >
