Re: Time-Delayed Standbys

(2013/12/09 19:35), Pavel Stehule wrote:
>
>
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> 2013/12/9 KONDO Mitsumasa <kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp
> <mailto:kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp>>
>
> Hi Fabrízio,
>
> I test your v4 patch, and send your review comments.
>
> * Fix typo
> > 49 -# commited transactions from the master, specify a recovery time delay.
> > 49 +# committed transactions from the master, specify a recovery time delay.
>
> * Fix white space
> > 177 - if (secs <= 0 && microsecs <=0)
> > 177 + if (secs <= 0 && microsecs <=0 )
>
> * Add functionality (I propose)
> We can set negative number at min_standby_apply_delay. I think that this feature
> is for world wide replication situation. For example, master server is in
> Japan and slave server is in San Francisco. Japan time fowards than San
> Francisco time
> . And if we want to delay in this situation, it can need negative number in
> min_standby_apply_delay. So I propose that time delay conditional branch
> change under following.
> > - if (min_standby_apply_delay > 0)
> > + if (min_standby_apply_delay != 0)
> What do you think? It might also be working collectry.
>
>
> what using interval instead absolute time?
This is because local time is recorded in XLOG. And it has big cost for
calculating global time.

Regards,
--
Mitsumasa KONDO
NTT Open Source Software Center