Re: [GENERAL] Template zero xid issue - Mailing list pgsql-hackers

From Gregory Stark
Subject Re: [GENERAL] Template zero xid issue
Date
Msg-id 87ir7rgob3.fsf@oxford.xeocode.com
Whole thread Raw
In response to Re: [GENERAL] Template zero xid issue  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: [GENERAL] Template zero xid issue  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
"Tom Lane" <tgl@sss.pgh.pa.us> writes:

> 4. Keep spawning a child, but mark it in the BackendList as known
> doomed, and don't count such children when deciding if it's OK to
> terminate.  The problem with this idea is that such children will
> still be connected to shared memory, and we really don't want to
> terminate the postmaster before all connections to shmem are gone.
> (This objection also applies to #1, now that I think about it.)
>
> I'm sort of leaning to solution #3, but I wondered if anyone had
> a different opinion or a better idea.

A variant on option 4 would be to stop accepting new connections once there
are only known-doomed clients left. Ie, behave as if we're shut down already
but not actually exit until all the known-doomed clients drain out.

I think I agree that option 3 sounds simpler though.

--  Gregory Stark EnterpriseDB          http://www.enterprisedb.com



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