Re: [PATCH 10/16] Introduce the concept that wal has a 'origin' node

Simon Riggs <simon@2ndquadrant.com>

From: Simon Riggs <simon@2ndQuadrant.com>

To: Robert Haas <robertmhaas@gmail.com>

Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>, Kevin Grittner <Kevin.Grittner@wicourts.gov>, Andres Freund <andres@2ndquadrant.com>, pgsql-hackers@postgresql.org, Daniel Farina <daniel@heroku.com>, Tom Lane <tgl@sss.pgh.pa.us>

Date: 2012-06-20T13:25:36Z

Lists: pgsql-hackers

Commits

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Don't waste the last segment of each 4GB logical log file.
- dfda6ebaec67 9.3.0 cited
Stamp HEAD as 9.3devel.
- bed88fceac04 9.3.0 cited
Wake WALSender to reduce data loss at failover for async commit.
- 2c8a4e9be273 9.2.0 cited
Make the visibility map crash-safe.
- 503c7305a1e3 9.2.0 cited

On 20 June 2012 21:19, Robert Haas <robertmhaas@gmail.com> wrote:
> On Wed, Jun 20, 2012 at 5:47 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
>> The idea that logical rep is some kind of useful end goal in itself is
>> slightly misleading. If the thought is to block multi-master
>> completely on that basis, that would be a shame. Logical rep is the
>> mechanism for implementing multi-master.
>
> If you're saying that single-master logical replication isn't useful,
> I disagree.  Of course, having both single-master and multi-master
> replication together is even more useful.

> But I think getting even
> single-master logical replication working well in a single release
> cycle is going to be a job and a half.

OK, so your estimate is 1.5 people to do that. And if we have more
people, should they sit around doing nothing?

> Thinking that we're going to
> get MMR in one release is not realistic.

If you block it, then the above becomes true, whether or not it starts true.

You may not want MMR, but others do. I see no reason to prevent people
from having it, which is what you suggest.

-- 
 Simon Riggs                   http://www.2ndQuadrant.com/
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