Serial consistency gets invoked at the protocol level when doing lightweight transactions such as CAS operations. If you're expecting that your topology is RF=2, N=2, it seems like some keyspace has RF=3, and so there aren't enough nodes available to satisfy serial consistency.
See http://docs.datastax.com/en/cassandra/2.0/cassandra/dml/dml_ltwt_transaction_c.html On Mon, Nov 2, 2015 at 1:29 AM Ajay Garg <ajaygargn...@gmail.com> wrote: > Hi All. > > I have a 2*2 Network-Topology Replication setup, and I run my application > via DataStax-driver. > > I frequently get the errors of type :: > *Cassandra timeout during write query at consistency SERIAL (3 replica > were required but only 0 acknowledged the write)* > > I have already tried passing a "write-options with LOCAL_QUORUM > consistency-level" in all create/save statements, but I still get this > error. > > Does something else need to be changed in /etc/cassandra/cassandra.yaml > too? > Or may be some another place? > > > -- > Regards, > Ajay >
