No, but you do need a quorum of nodes. http://www.datastax.com/documentation/cassandra/2.0/cassandra/dml/dml_config_consistency_c.html
SERIAL A write must be written conditionally to the commit log and memory table on a quorum of replica nodes. Used to achievelinearizable consistency<http://www.datastax.com/documentation/cassandra/2.0/cassandra/dml/dml_tunable_consistency_c.html#concept_ds_f4h_hwx_zj>for lightweight transactions by preventing unconditional updates. On Apr 16, 2014 5:56 AM, "Vivek Mishra" <mishra.v...@gmail.com> wrote: > Thanks Mark. does this mean with RF=3, all 3 nodes must be up and running > for CAS updates? > > -Vivek > > > On Wed, Apr 16, 2014 at 6:22 PM, Mark Reddy <mark.re...@boxever.com>wrote: > >> create keyspace twitter with replication = {'class':'SimpleStrategy', >>> 'replication_factor' : 3} >> >> >> Your replication factor is your issue here, you have a single node and a >> RF=3. For a single node setup your RF should be 1. You can find more info >> about replication here: >> http://www.datastax.com/documentation/cassandra/2.0/cassandra/architecture/architectureDataDistributeReplication_c.html >> >> >> On Wed, Apr 16, 2014 at 1:44 PM, Vivek Mishra <mishra.v...@gmail.com>wrote: >> >>> Hi, >>> Mine is a simple case. Running on single node only. Keyspace is: >>> >>> create keyspace twitter with replication = {'class':'SimpleStrategy', >>> 'replication_factor' : 3} >>> >>> -Vivek >>> >>> >>> On Wed, Apr 16, 2014 at 1:27 AM, Tupshin Harper <tups...@tupshin.com>wrote: >>> >>>> Please provide your keyspace definition, and the output of "nodetool >>>> ring" >>>> >>>> -Tupshin >>>> On Apr 15, 2014 3:52 PM, "Vivek Mishra" <mishra.v...@gmail.com> wrote: >>>> >>>>> Hi, >>>>> I am trying Cassandra light weight transaction support with Cassandra >>>>> 2.0.4 >>>>> >>>>> cqlsh:twitter> create table user(user_id text primary key, namef text); >>>>> cqlsh:twitter> insert into user(user_id,namef) values('v','ff') if not >>>>> exists; >>>>> >>>>> *Unable to complete request: one or more nodes were unavailable.* >>>>> >>>>> Any suggestions? >>>>> >>>>> -Vivek >>>>> >>>> >>> >> >
