It means asynchronous write mutations were dropped, but if the writes are completing without TimedOutException, then at least ConsistencyLevel replicas were correctly written. The remaining replicas will eventually be fixed by hinted handoff, anti-entropy (repair) or read repair.
More info: http://wiki.apache.org/cassandra/FAQ#dropped_messages Please note that 1 mutation != 1 record. For instance, if 1 row has N columns, than a record write for that row will have N mutations AFAIK (please correct me if I'm wrong). On Fri, May 9, 2014 at 8:52 AM, Raveendran, Varsha IN BLR STS < varsha.raveend...@siemens.com> wrote: > Hello, > > I am writing around 10Million records continuously into a single node > Cassandra (2.0.5) . > In the Cassandra log file I see an entry “*272 MUTATION messages dropped > in last 5000ms*” . Does this mean that 272 records were not written > successfully? > > Thanks, > Varsha > > -- *Paulo Motta* Chaordic | *Platform* *www.chaordic.com.br <http://www.chaordic.com.br/>* +55 48 3232.3200
