Thanks to everyone who gave great feedback on the first queue service thread. I've updated the wiki page to include the suggestions.
http://wiki.openstack.org/QueueService With a decent vision of what we want to build, the next step is figuring out how. In a previous thread it was suggested that the preferred languages for OpenStack projects are Python, C, and C++. Since there is an emphasis on speed and efficiency for the queue service, I suggest we use C++. I expect this service to be CPU bound and would benefit being able to leverage multiple cores efficiently (within the same process), so I don't think Python is a good fit. I think C++ is a better fit than C due to the need for modular interfaces. While this can obviously be done in C, C++ APIs are more concise and much less error prone. The OO style will also make it easier for Python developers who also want to learn and assist with C++ projects. Erlang is not on the preferred lists, but I would also put it out there as an option. While it may be a great fit for a project like this, I worry it won't attract the developer resources since Erlang isn't really a first-class language yet. If we decide to take the C++ path, I propose using a modular application framework I've been working on over the past year (mostly in my spare time). It provides a simple module programming interface with dependency tracking (kind of like Linux kernel modules). It already provides a multi-threaded event module (currently based on libevent, but this is pluggable) with simple networking abstractions built on top of it. We should be able to dive in an start writing the HTTP protocol module and queue processing modules. You can check out the current project at: https://launchpad.net/scalestack http://scalestack.org/ The intention of using a framework like this is so we can easily reuse the other modules (auth, HTTP, logging, ...) for other OpenStack services in the future. Much like we use Eventlet, WSGI, etc. (and eventually openstack-common) for Python, we could prefer using the modules in Scale Stack for lower level projects. Thoughts? -Eric _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
