Hi Peter, Good call! I went and checked the seed, and indeed it left unchanged when we copied the config yaml file from the first node to the second node. Thanks!
-- Y. On Fri, Sep 9, 2011 at 7:47 PM, Peter Schuller <peter.schul...@infidyne.com>wrote: > > cluster name for both machines. So in other words, if we want to launch > two > > separate instances of cassandra and keep them separate, we must make sure > > each uses a different cluster name or else they will gang up into the > same > > cluster? But how do they even discover each other? Can someone > enlighten > > me please? Thanks. > > It is highly recommended to use distinct cluster names, in particular > because it can help avoid accidentally "merging" two independent > clusters. > > As for how it happened: There is no magic discovery going on that > would pick IP:s at random, but one could certainly e.g. accidentally > configure the seed node on one to point to the other or some such. > > (1) does nodetool -h localhost ring show an unexpected node? > (2) i'd suggest checking system.log on each node for the first > appearance (if any) of the "unexpected" ip address and correlate (by > time) with what happened on the other node (was it restarted at the > time for example, potentially wth a bad conf?) > (3) are these two single-instance cassandras that have never > participated in another cluster? > > -- > / Peter Schuller (@scode on twitter) >
