| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | Tatsuo Ishii <ishii(at)postgresql(dot)org>, robertmhaas(at)gmail(dot)com, pgsql(at)j-davis(dot)com, tgl(at)sss(dot)pgh(dot)pa(dot)us, markus(at)bluegap(dot)ch, masao(dot)fujii(at)gmail(dot)com, aidan(at)highrise(dot)ca, heikki(dot)linnakangas(at)enterprisedb(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Sync Rep: First Thoughts on Code |
| Date: | 2008-12-15 09:44:25 |
| Message-ID: | 494626F9.7040500@gmx.net |
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| Lists: | pgsql-hackers |
Simon Riggs wrote:
> I am truly lost to understand why the *name* "synchronous replication"
> causes so much discussion, yet nobody has discussed what they would
> actually like the software to *do*
It's the color of the bikeshed ...
> We can make the reply to a commit message when any of the following
> events have occurred
>
> 1. We sent the message to standby
> 2. We received the message on standby
> 3. We wrote the WAL to the WAL file
> 4. We fsync'd the WAL file
> 5. We CRC checked the WAL commit record
> 6. We applied the WAL commit record
In DRBD tradition, I suggest you implement all of them, or at least
factor the code so that each of them can be a one line change. (We can
probably later drop one or two options.)
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