[zeromq-dev] Migrating to 0MQ/3.0

[Pieter Hintjens]

Hi all,

On IRC, Mikko raised the issue that 3.0's wire protocol is not
compatible with 2.1, meaning any migration to 3.0 has to involve an
entire network at once (meaning downtime, and no way to make partial
upgrades).

After some discussion, we'd like to use the 2.2 branch to create a
migration path. Basically it means making 2.2 able to speak old and
new versions of the protocol, so that architectures can first upgrade
parts to 2.2, and then to 3.0 over time.

I've started a roadmap page here: http://www.zeromq.org/docs:2-2

It would be useful to get feedback on this proposal from people who'd
like to upgrade to 3.0 (e.g. to get subscription forwarding).

-Pieter