[Openstack] Queue Service, next steps
curtis.carter at rackspace.com
Fri Feb 18 10:03:59 UTC 2011
I'm in if it's done in Erlang.
I am willing to give talks or help anyone wanting to learn Erlang in the Austin/San Antonio area as well.
On Feb 18, 2011, at 12:11 AM, Eric Day wrote:
> Duck farm? :)
> Are you two concerned about building a developer community around a
> project in Erlang? I'm all for going that route if other folks are
> comfortable with it.
> I also have some concern around the speed of Erlang. It's great,
> especially if you know what primitives can be expensive and how to
> tame beam, but it will always be slower (sometimes significantly)
> that C/C++ for some tasks.
> On Thu, Feb 17, 2011 at 03:26:09PM -0800, Joshua McKenty wrote:
>> +1 for Erlang, as long as we have a duck farm.
>> On Thu, Feb 17, 2011 at 2:25 PM, Devin Carlen <devin.carlen at gmail.com>
>> I'll put in a +1 for Erlang as an OpenStack supported platform. We'd be
>> able to write a stable queue with a much more concise code base, and
>> this is project would be a great fit for Erlang.
>> On Feb 17, 2011, at 2:21 PM, Eric Day wrote:
>>> Thanks to everyone who gave great feedback on the first queue service
>>> thread. I've updated the wiki page to include the suggestions.
>>> 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:
>>> 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.
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