Re: Replication identifiers, take 4

On 2015-04-20 11:26:29 +0300, Heikki Linnakangas wrote:
> On 04/17/2015 11:54 AM, Andres Freund wrote:
> >I've attached a rebased patch, that adds decision about origin logging
> >to the relevant XLogInsert() callsites for "external" 2 byte identifiers
> >and removes the pad-reusing version in the interest of moving forward.
>
> Putting aside the 2 vs. 4 byte identifier issue, let's discuss naming:
>
> I just realized that it talks about "replication identifier" as the new
> fundamental concept. The system table is called "pg_replication_identifier".
> But that's like talking about "index identifiers", instead of just indexes,
> and calling the system table pg_index_oid.
>
> The important concept this patch actually adds is the *origin* of each
> transaction. That term is already used in some parts of the patch. I think
> we should roughly do a search-replace of "replication identifier" ->
> "replication origin" to the patch. Or even "transaction origin".

Attached is a patch that does this, and some more, renaming. That was
more work than I'd imagined. I've also made the internal naming in
origin.c more consistent/simpler and did a bunch of other cleanup.

I'm pretty happy with this state.

Greetings,

Andres Freund