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From Watanabe Maki <watanabe.m...@gmail.com>
Subject Re: network/message simulation framework?
Date Sat, 25 Jun 2011 10:40:32 GMT
iptables?

From iPhone


On 2011/06/25, at 12:47, Yang <teddyyyy123@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 <jbellis@gmail.com> wrote:
> The MessageSink code is designed for this.  Look in MessagingService.sendOneWay.
> 
> On Fri, Jun 24, 2011 at 9:58 PM, Yang <teddyyyy123@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
> 

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