Re: Outdated replication protocol error?

On 2021/01/12 9:06, Jeff Davis wrote:
> Commit 5ee2197767 (about 4 years old) introduced the error:
>
> "IDENTIFY_SYSTEM has not been run before START_REPLICATION"
>
> But it seems like running START_REPLICATION first works (at least in
> the simple case).
>
> We should either:
>
> 1. Document that IDENTIFY_SYSTEM must always be run before
> START_REPLICATION, and always issue a WARNING if that's not done (an
> ERROR might break existing applications); or
>
> 2. If the commit is out of date and no longer needed, or if it's easy
> enough to fix, just remove the error (and Assert a valid
> ThisTimeLineID).

+1 to remove the error if START_REPLICATION can always work fine without
IDENTIFY_SYSTEM. I found that the error happens when we connect to the standby
and just run START_REPLICATION without IDENTIFY_SYSTEM. But I'm not sure
if IDENTIFY_SYSTEM is actually necessary even in that case.

Regards,

--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION