From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-committers(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: [HACKERS] Re: pgsql: Make CheckRequiredParameterValues() depend upon correct |
Date: | 2010-04-23 22:24:46 |
Message-ID: | 18293.1272061486@sss.pgh.pa.us |
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Lists: | pgsql-committers pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Fri, Apr 23, 2010 at 4:44 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> A design that might work is
>> (1) store the active value of wal_mode in pg_control (but NOT as part of
>> the last-checkpoint-record image).
>> (2) invent a new WAL record type that is transmitted when we change
>> wal_mode.
> Well, right now wal_mode would only be able to be changed at server
> restart.
Right, but slave servers won't find out about the change until the first
checkpoint after the start. Which is Too Late.
regards, tom lane
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