I see now that you can obtain "cheap" multiple IPs on the same box by creating virtual NICs, and then create one thrift server on each of these NIC/IPs
but a remaining problem is that to do the tests, you'd have to fire up multiple JVMs, because a lot of structures in Cassandra are static, then the tests can be carried out in a shell script organizing several java processes, slightly less convenient than a single junit process which orchestrates those multiple servers in a single JVM yang On Sat, Jun 25, 2011 at 3:40 AM, Watanabe Maki <watanabe.m...@gmail.com>wrote: > iptables? > > From iPhone > > > On 2011/06/25, at 12:47, Yang <teddyyyy...@gmail.com> wrote: > > Thanks Jonathan. > > this provides a way to essentially get a copy of the outgoing messages, > the messages onto the real connections still go through, but I would need a > way > to shut off the real connections too. > > shutting off the connections could probably done by mocking the > TCPconnection class, > but an even more difficult thing is that the ThriftSocket etc will need to > open a java.net.Socket, which > hooks onto the real IP address and port, in a simulation environment, we'd > need to > mock out the java.net.Socket too, that sounds more difficult. > > yang > > On Fri, Jun 24, 2011 at 8:23 PM, Jonathan Ellis < <jbel...@gmail.com> > jbel...@gmail.com> wrote: > >> The MessageSink code is designed for this. Look in >> MessagingService.sendOneWay. >> >> On Fri, Jun 24, 2011 at 9:58 PM, Yang < <teddyyyy...@gmail.com> >> teddyyyy...@gmail.com> wrote: >> > I'd like to verify the behavior of Cassandra under some edge case >> message >> > loss scenarios. >> > it's rather difficult to reproduce such things, cuz you have to setup >> > multiple servers, and on each box essentially control >> > the message "gates" to any other nodes in the network. the realistic way >> > that I can think of is to close off all traffic and only manually >> > allow certain messages to pass through. (in the case of Cassandra, we >> need >> > to let through all gossip messages, and manually control >> > replication messages ) >> > are there some existing simulation frameworks around? junit + various >> mock >> > frameworks look like a good fit, but >> > in reality is not enough to simulate complex network code, for example, >> it's >> > basically impossible to setup a simulated >> > N-node cluster on only one test box. >> > >> > Thanks >> > Yang >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> <http://www.datastax.com>http://www.datastax.com >> > >
