Re: pg_rewind in contrib

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Satoshi Nagayasu <snaga(at)uptime(dot)jp>, PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>, Michael Paquier <mpaquier(at)vmware(dot)com>
Subject: Re: pg_rewind in contrib
Date: 2015-01-06 23:54:59
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On 01/06/2015 03:39 PM, Peter Eisentraut wrote:
> I applaud the ingenuity on all levels in this patch. But it seems to me
> that there is way too much backend knowledge encoded and/or duplicated
> in a front-end program.
> If this ends up shipping, it's going to be a massively popular tool. I
> see it as a companion to pg_basebackup. So it should sort of work the
> same way. One problem is that it doesn't use the replication protocol,
> so the setup is going to be inconsistent with pg_basebackup. Maybe the
> replication protocol could be extended to provide the required data.
> Maybe something as simple as "give me this file" would work.
> That might lose the local copy mode, but how important is that?
> pg_basebackup doesn't have that mode. In any case, the documentation
> doesn't explain this distinction. The option documentation is a bit
> short in any case, but it's not clear that you can choose between local
> and remote mode.
> The test suite should probably be reimplemented in Perl. (I might be
> able to help.) Again, ingenious, but it's very hard to follow the
> sequence of what is being tested. And some Windows person is going to
> complain. ;-)
> Also, since you have been maintaining this tool for a while, what is the
> effort for maintaining it from version to version?

I also think it's a great idea. But I think we should consider the name
carefully. pg_resync might be a better name. Strictly, you might not be
quite rewinding, AIUI.



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