From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
---|---|
To: | Aidan Van Dyk <aidan(at)highrise(dot)ca> |
Cc: | David Fetter <david(at)fetter(dot)org>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: is sync rep stalled? |
Date: | 2010-10-05 03:48:53 |
Message-ID: | AANLkTikvY5VJocMEXLGgtxtp1ej0BGBHFBKad_F0j9+t@mail.gmail.com |
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On Tue, Oct 5, 2010 at 2:06 AM, Aidan Van Dyk <aidan(at)highrise(dot)ca> wrote:
> On Mon, Oct 4, 2010 at 10:22 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>
>> I have one question for clarity:
>>
>> If we make all the transactions wait until specified standbys have
>> connected to the master, how do we take a base backup from the
>> master for those standbys? We seem to be unable to do that because
>> pg_start_backup also waits forever. Is this right?
>
> Well, in my *opinion*, if you've told the master to not "commit to"
> *anything* unless it's synchronously replicated, you should already
> have a synchronously replicating slave up and running.
>
> I'm happy with the docs saying (maybe some what more politely):
> Before configuring your master to be completly,
> wait-fully-synchronous, make sure you have a slave capable of being
> synchronous ready. Because if you've told it to never be
> un-synchronous, it won't be.
How can we take a base backup for that synchronous standby? You mean
that we should disable the wait-forever option, start the master, take
a base backup, shut down the master, enable the wait-forever option,
start the master, and start the standby from that base backup?
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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