Re: WALInsertLock tuning

On Tue, Jun 7, 2011 at 9:54 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> On Tue, Jun 7, 2011 at 1:24 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>
>> One other thought is that I think that this patch might cause a
>> user-visible behavior change.  Right now, when you hit the end of
>> recovery, you most typically get a message saying - record with zero
>> length.  Not always, but often.  If we adopt this approach, you'll get
>> a wider variety of error messages there, depending on exactly how the
>> new record fails validation.  I dunno if that's important to be worth
>> caring about, or not.
>
> Not.
>
> We've never said what the message would be, only that it would fail.

BTW, walreceiver doesn't zero the page before writing the WAL. So,
if zeroing the page is *really* required for safe recovery, we might need
to change walreceiver.

Regards,

--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center