What's your replication factor? Do you have RF=2 on both datacenters?
On Mon, Jun 3, 2013 at 10:09 PM, srmore <comom...@gmail.com> wrote: > I am a bit confused when using the consistency level for multi datacenter > setup. Following is my setup: > > I have 4 nodes the way these are set up are > Node 1 DC 1 - N1DC1 > Node 2 DC 1 - N2DC1 > > Node 1 DC 2 - N1DC2 > Node 2 DC 2 - N2DC2 > > I setup a delay in between two datacenters (DC1 and DC2 around 1 sec one > way) > > I am observing that when I use consistency level 2 for some reason the > coordinate node is picking up the nodes from other datacenter. My > understanding was that Cassandra picks up nodes which are close by (from > local datacenter), determined by Gossip but looks like that's not the case. > > I found the following comment on Datastax website : > > "If using a consistency level of ONE or LOCAL_QUORUM, only the nodes in > the same data center as the coordinator node must respond to the client > request in order for the request to succeed." > > Does this mean that for multi datacenter we can only use ONE or > LOCAL_QUORUM if we want to use the local datacenter to avoid cross > datacenter latency. > > I am using the GossipingPropertyFileSnitch. > > Thanks ! > >
