cinder/releasenotes/notes/rpc_compatibility-375be8ac3...

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---
features:
- Added RPC backward compatibility layer similar to the
one implemented in Nova. This means that Cinder
services can be upgraded one-by-one without breakage.
After all the services are upgraded SIGHUP signals
should be issued to all the services to signal them
to reload cached minimum RPC versions. Alternative
is of course restart of them. Please note that
cinder-api service doesn't support SIGHUP yet.
Please also take into account that all the rolling
upgrades capabilities are considered tech preview,
as we don't have a CI testing it yet.
upgrade:
- Starting from Mitaka release Cinder is having a tech
preview of rolling upgrades support.