| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Christopher Browne <cbbrowne(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Daniel Farina <daniel(at)heroku(dot)com> |
| Subject: | Re: [PATCH 10/16] Introduce the concept that wal has a 'origin' node |
| Date: | 2012-06-19 22:08:50 |
| Message-ID: | CA+U5nM+B3WrvT1hawkbEJG8f-Y0TZW34_AbYVQtU59WE+7CT5w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 20 June 2012 05:59, Christopher Browne <cbbrowne(at)gmail(dot)com> wrote:
> But it's undesirable to pull *all* the bulk of contents of WAL around
> if it's only part of the data that is going to get applied. On a
> "physical streaming" replica, any logical data that gets captured will
> be useless. And on a "logical replica," they "physical" bits of WAL
> will be useless.
Completely agree.
What we're discussing here is the basic information content of a WAL
record to enable the construction of suitable LCRs.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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