| From: | Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Avoid full page images in streaming replication? |
| Date: | 2015-10-22 22:59:06 |
| Message-ID: | 56296A3A.5090403@BlueTreble.com |
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| Lists: | pgsql-hackers |
On 10/22/15 5:52 PM, Andres Freund wrote:
>> If the receiver didn't write the WAL before processing it then it can just
>> >stick the page image into the WAL it's writing for itself. Probably not good
>> >for syncrep, but I don't think you'd want this on for syncrep anyway.
> To me this sounds like a recipe for disaster (i.e. complex bugs). WAL
> (and thus CRC checksums) differing between nodes. Ugh.
The WAL would *not* differ. This would only affect streaming
replication, and only the stream itself.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
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