2013-08-20 08:37 keltezéssel, Heikki Linnakangas írta:
On 19.08.2013 21:15, Boszormenyi Zoltan wrote:
2013-08-19 19:20 keltezéssel, Andres Freund írta:
Based on a quick look it seems like you're throttling on the receiving
side. Is that a good idea? Especially over longer latency links, TCP
buffering will reduce the effect on the sender side considerably.
Throttling on the sender side requires extending the syntax of
BASE_BACKUP and maybe START_REPLICATION so both can be
throttled but throttling is still initiated by the receiver side.
Throttling in the client seems much better to me. TCP is designed to handle a
slow client.
Maybe throttling the walsender is not a good idea, it can lead
to DoS via disk space shortage.
If a client can initiate a backup and/or streaming replication, he can already do much
more damage than a DoS via out of disk space. And a nothing stops even a non-privileged
user from causing an out of disk space situation anyway. IOW that's a non-issue.
I got to the same conclusion this morning, but because of wal_keep_segments.
Best regards,
Zoltán Böszörményi
- Heikki
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Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
Gröhrmühlgasse 26
A-2700 Wiener Neustadt, Austria
Web: http://www.postgresql-support.de
http://www.postgresql.at/
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