Hello, As far as I know, lightweight transactions only apply to a single partition, so in your case it will only execute on the nodes responsible for that partition. And as a consequence, those nodes will all be in the same state when the transaction ends (If it would apply).
Please refer to this blog post for more information about the LIghtweigth transactions: http://www.datastax.com/dev/blog/lightweight-transactions-in-cassandra-2-0 Regards, Carlos Juzarte Rolo Cassandra Consultant / Datastax Certified Architect / Cassandra MVP Pythian - Love your data rolo@pythian | Twitter: @cjrolo | Skype: cjr2k3 | Linkedin: *linkedin.com/in/carlosjuzarterolo <http://linkedin.com/in/carlosjuzarterolo>* Mobile: +351 918 918 100 www.pythian.com On Thu, May 12, 2016 at 12:17 PM, Siddharth Verma < verma.siddha...@snapdeal.com> wrote: > Hi, > If i have inconsistent data on nodes > Scenario : > I have 2 DCs each with 3 nodes > and I have inconsistent data on them > > node 1,2,3,4,5 have > P1,100,A,val1,w1 > P1,100,B,val2,w2 > > node 6 has > P1,100,A,val1,w1 > P1,100,B,val2,w2 > P1,200,C,val3,w3 > P1,200,D,val4,w4 > > col1, col2, col3,col4,col5 in table > Primary key (col1, col2, col3) > > Now i execute the query from CQLSH > update mykeyspace.my_table_1 set col5 = 'w_x' where col1='P1' and col2=200 > and col3='C' IF EXISTS; > > Is it possible that > node 1,2,3,4,5 will get the entry > P1,200,C,null,w_x > > I.e. IF EXISTS is checked per node or only once and then execute on all? > > Thanks > Siddharth Verma > -- --
