Question

I’m writing an app on GAE/J with GWT. On my dev machines, things work perfectly – and RPCs always return successfully, and in the same order. When I deploy to appengine, some RPCs fail, and they often return in a different order.

How can a testing environment incorporate this kind of variability? Are there any good tools that can handle this for appengine?

Answer 1

NIST Net is a mature network emulator.

Quiting from their site:

The NIST Net network emulator is a general-purpose tool for emulating performance dynamics in IP networks. The tool is designed to allow controlled, reproducible experiments with network performance sensitive/adaptive applications and control protocols in a simple laboratory setting. By operating at the IP level, NIST Net can emulate the critical end-to-end performance characteristics imposed by various wide area network situations (e.g., congestion loss) or by various underlying subnetwork technologies (e.g., asymmetric bandwidth situations of xDSL and cable modems).