| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, pavan(dot)deolasee(at)gmail(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Synchronous replication patch v2 |
| Date: | 2008-11-14 17:07:34 |
| Message-ID: | 1226682454.27904.631.camel@ebony.2ndQuadrant |
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| Lists: | pgsql-hackers |
On Fri, 2008-11-14 at 19:00 +0200, Heikki Linnakangas wrote:
> Fujii Masao wrote:
> > Attached is the latest version of Synch Rep patch.
>
> Why do we need a separate XLogsndRqst variable in shared memory? Don't
> we always want to send the WAL up to the same point as we flush it?
If we're doing synch rep and we're committing. What happens when we're
doing async rep or running something like a large load. I wouldn't want
to presume that the network packet size and the disk write size are
always identical.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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