Thanks Mark and Tuphsin. So on single node, if i set consistency level to SERIAL and create a keyspace with RF=1? Would that work?
-Vivek On Wed, Apr 16, 2014 at 6:32 PM, Mark Reddy <mark.re...@boxever.com> wrote: > The Paxos protocol used for CAS operations will always use at least a > consistency level effectively equivalent to QUORUM (called SERIAL) when > writing, even if you explicitly specify a lower level, e.g. ANY or ONE. > Setting consistency level to ALL will make the write execute on all > replicas if the condition is met, but the comparison itself is executed > against a QUORUM number of nodes. As a result, a write operation with ALL > consistency level that fails to meet the specified check may not throw an > Exception, even if some replica nodes are not accessible. > > > > On Wed, Apr 16, 2014 at 2:00 PM, Tupshin Harper <tups...@tupshin.com>wrote: > >> 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 >>>>>>> >>>>>> >>>>> >>>> >>> >
