Re: Synchronization levels in SR

On 5/27/2010 4:31 PM, Bruce Momjian wrote:
> Heikki Linnakangas wrote:
>> BTW, I think we're going to need a separate config file for listing the
>> standbys anyway. There you can write per-server rules and options, but
>> explicitly knowing about all the standbys also allows the master to
>> recycle WAL as soon as it has been streamed to all the registered
>> standbys. Currently we just keep wal_keep_segments files around, just in
>> case there's a standby out there that needs them.
>
> Ideally we could set 'slave_sync_count' and 'slave_commit_continue_mode'
> on the master, and allow the sync/async mode to be set on each slave,
> e.g. if slave_sync_count = 2 and slave_commit_continue_mode = #2, then
> two slaves with sync mode of #2 or stricter have to complete before the
> master can continue.
>
> Naming the slaves on the master seems very confusing because I am
> unclear how we would identify named slaves, and the names have to match,
> etc.
>
> Also, what would be cool would be if you could run a query on the master
> to view the SR commit mode of each slave.

What would be the use case for such a query?

Jan

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Anyone who trades liberty for security deserves neither
liberty nor security. -- Benjamin Franklin