Re: [PATCH 01/16] Overhaul walsender wakeup handling
| От | Robert Haas |
|---|---|
| Тема | Re: [PATCH 01/16] Overhaul walsender wakeup handling |
| Дата | |
| Msg-id | CA+TgmobWdxEhm1Y4fPHPp-J3anayCEO5tzx7bk4KktdtwuzrLw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: [PATCH 01/16] Overhaul walsender wakeup handling (Andres Freund <andres@2ndquadrant.com>) |
| Ответы |
Re: [PATCH 01/16] Overhaul walsender wakeup handling
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| Список | pgsql-hackers |
On Fri, Jun 22, 2012 at 10:45 AM, Andres Freund <andres@2ndquadrant.com> wrote: >> > the likelihood of that as you know. >> Hmm, well, I guess. I'm still not sure I really understand what >> benefit we're getting out of this. If we lose a few WAL records for >> an uncommitted transaction, who cares? That transaction is gone >> anyway. > Well, before the simple fix Simon applied after my initial complaint you > didn't get wakeups *at all* in the synchronous_commit=off case. > > Now, with the additional changes, the walsender is woken exactly when data is > available to send and not always when a commit happens. I played around with > various scenarios and it always was a win. Can you elaborate on that a bit? What scenarios did you play around with, and what does "win" mean in this context? -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
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