Re: Quorum commit for multiple synchronous replication.

On Sat, Sep 17, 2016 at 2:04 AM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> Since we already released 9.6RC1, I understand that it's quite hard to
> change syntax of 9.6.
> But considering that we support the quorum commit, this could be one
> of the solutions in order to avoid breaking backward compatibility and
> to provide useful user interface.
> So I attached these patches.

 standby_config:
-        standby_list                { $$ = create_syncrep_config("1", $1); }
-        | FIRST NUM '(' standby_list ')'    { $$ =
create_syncrep_config($1, $4); }
+        standby_list                        { $$ =
create_syncrep_config("1", $1, SYNC_REP_PRIORITY); }
+        | ANY NUM '(' standby_list ')'        { $$ =
create_syncrep_config($2, $4, SYNC_REP_QUORUM); }
+        | FIRST NUM '(' standby_list ')'    { $$ =
create_syncrep_config($2, $4, SYNC_REP_PRIORITY); }

Reading again the thread, it seems that my previous post [1] was a bit
misunderstood. My position is to not introduce any new behavior
changes in 9.6, so we could just make the FIRST NUM grammar equivalent
to NUM.

[1]: https://www.postgresql.org/message-id/CAB7nPqRDvJn18e54ccNpOP1A2_iUN6-iU=4nJgmMgiAgvcSDKA@mail.gmail.com
-- 
Michael