From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com>, Steve Singer <steve(at)ssinger(dot)info>, Petr Jelinek <petr(at)2ndquadrant(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
Subject: | Re: Replication identifiers, take 4 |
Date: | 2015-02-16 00:24:21 |
Message-ID: | 20150216002421.GJ15326@awork2.anarazel.de |
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Lists: | pgsql-hackers |
On 2015-02-16 01:21:55 +0100, Andres Freund wrote:
> Here's my next attept attempt at producing something we can agree
> upon.
>
> The major change that might achieve that is that I've now provided a
> separate method to store the origin_id of a node. I've made it
> conditional on !REPLICATION_IDENTIFIER_REUSE_PADDING, to show both
> paths. That new method uses Heikki's xlog rework to dynamically add the
> origin to the record if a origin is set up. That works surprisingly
> simply.
>
> Other changes:
>
> * Locking preventing several backends to replay changes at the same
> time. This is actually overly restrictive in some cases, but I think
> good enough for now.
> * Logical decoding grew a filter_by_origin callback that allows to
> ignore changes that were replayed on a remote system. Such filters are
> executed before much is done with records, potentially saving a fair
> bit of costs.
> * Rebased. That took a bit due the xlog and other changes.
> * A couple more SQL interface functions (like dropping a replication
> identifier).
And here an actual patch.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
Attachment | Content-Type | Size |
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0001-Introduce-replication-identifiers-to-keep-track-of-r.patch | text/x-patch | 91.4 KB |
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