Hi Riyad, You can set replication = 5 (number of replicas) and write with CL = ONE. There is no hard requirement from Cassandra to write with CL=ALL to replicate the data unless you need it. Considering your example, If you write with CL=ONE then also it will replicate your data to all 5 replicas eventually.
Thank you, Jaydeep ________________________________ From: Riyad Kalla <rka...@gmail.com> To: "user@cassandra.apache.org" <user@cassandra.apache.org> Sent: Sunday, 6 November 2011 9:50 PM Subject: Will writes with < ALL consistency eventually propagate? I am new to Cassandra and was curious about the following scenario... Lets say i have a ring of 5 servers. Ultimately I would like each server to be a full replication of the next (master-master-*). In a presentation i watched today on Cassandra, the presenter mentioned that the ring members will shard data and route your requests to the right host when they come in to a server that doesnt physically contain the value you wanted. To the client requesting this is seamless excwpt for the added latency. If i wanted to avoid the routing and latency and ensure every server had the full data set, do i have to write with a consistency level of ALL and wait for all of those writes to return in my code, or can i write with a CL of 1 or 2 and let the ring propagate the rest of the copies to the other servers in the background after my code has continued executing? I dont mind eventual consistency in my case, but i do (eventually) want all nodes to have all values and cannot tell if this is default behavior, or if sharding is the default and i can only force duplicates onto the other servers explicitly with a CL of ALL. Best, Riyad
