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> 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> 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 >
