[openstack-dev] Zero MQ remove central broker. Architecture change.

Ilya Pekelny ipekelny at mirantis.com
Tue Nov 18 09:32:22 UTC 2014

Thank you, Li Ma!

Yes, sure I'm going to provide more detailed mail with a solid propositions
list. I need to do some knowledge updates before I provide it.

On Tue, Nov 18, 2014 at 10:40 AM, Li Ma <skywalker.nick at gmail.com> wrote:

>  On 2014/11/17 18:44, Ilya Pekelny wrote:
> Hi, all!
>  We want to discuss opportunity of implementation of the p-2-p messaging
> model in oslo.messaging for ZeroMQ driver. Actual architecture
> uses uncharacteristic single broker architecture model. In this way we are
> ignoring the key 0MQ ideas. Lets describe our message in quotes from ZeroMQ
> documentation:
>    - ZeroMQ has the core technical goals of simplicity and scalability,
>    the core social goal of gathering together the best and brightest minds in
>    distributed computing to build real, lasting solutions, and the political
>    goal of breaking the old hegemony of centralization, as represented by most
>    existing messaging systems prior to ZeroMQ.
>     - The ZeroMQ Message Transport Protocol (ZMTP) is a transport layer
>    protocol for exchanging messages between two peers over a connected
>    transport layer such as TCP.
>    - The two peers agree on the version and security mechanism of the
>    connection by sending each other data and either continuing the discussion,
>    or closing the connection.
>    - The two peers handshake the security mechanism by exchanging zero or
>    more commands. If the security handshake is successful, the peers continue
>    the discussion, otherwise one or both peers closes the connection.
>    - Each peer then sends the other metadata about the connection as a
>    final command. The peers may check the metadata and each peer decides
>    either to continue, or to close the connection.
>    - Each peer is then able to send the other messages. Either peer may
>    at any moment close the connection.
> From the current code docstring:
>      ZmqBaseReactor(ConsumerBase):
>         """A consumer class implementing a centralized casting broker
> Hi, Ilya, thanks for raising this topic. Inline you discussed about the
> ZeroMQ nature, but I still cannot find any directions to how to refactor or
> redesign the ZeroMQ driver for olso.messaging. :-< Could you provide more
> details about how you think of it?
>   This approach is pretty unusual for ZeroMQ. Fortunately we have a bit
> of raw developments around the problem. These changes can introduce
> performance improvement. But to proof it we need to implement all new
> features, at least at WIP status. So, I need to be sure that the community
> doesn't avoid such of improvements.
> For community works, AFAIK, we'd first initialize CI for ZeroMQ. After
> that, we can work together on how to improve performance, reliability and
> scalability of ZeroMQ driver.
> cheers,
> Li Ma
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