On Fri, Jan 25, 2013 at 8:07 AM, Nicolas Lalevée <nicolas.lale...@hibnet.org > wrote:
> Just a quick question about the attributes exposed via JMX. I have some > doc [1] but it doesn't help about CF beans. > > The "BloomFilterFalseRatio", is that the ratio of found vs missed, or the > ratio of false positive vs the number of tests, or something else ? > False positives. You should be aware of this bug, though: https://issues.apache.org/jira/browse/CASSANDRA-4043 > > The "ReadCount" and "WriteCount", how do they count regarding the > replication factor ? As far as I understand, the read and write on the > StorageProxy is the actual number of requests coming from clients. So > judging that the sum on all cf of the read and write is near equal to the > replication factor multiply by the number of read and write on the > StorageProxy, I am guessing that the read and write per cf are the replicas > one. Am I right ? > > StorageProxy read/write counts should equal the number of client requests. ColumnFamily read/write counts correspond to actual, local data reads, so the sum of this number across all nodes will be approximately RF * the StorageProxy counts. -- Tyler Hobbs DataStax <http://datastax.com/>
