Major version upgrades + Replication

Hello,

We have a setup with 1 primary, a synchronous replica and two asynchronous
replicas all running on PostgreSQL 9.1. I'm in the progress of planning an
upgrade to 9.4 so that we can make use of cascading replication.

The process I'm planning currently is:

- Kill primary
- Upgrade primary to 9.4 with pg_upgrade --link
- Upgrade synchronous secondary with pg_upgrade --link

At this point will the secondary replicate from the primary correctly or do
I need to
rsync everything across again?

I understand that the 9.1 replicas won't be able to replicate from 9.4
until they're upgraded; however I'm I'm hoping to essentially pg_upgrade
all the replicas and avoid having to rsync the upgraded master to all it's
replicas.

Thanks,
Rob

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