Re: An example of bugs for Hot Standby
От | Simon Riggs |
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Тема | Re: An example of bugs for Hot Standby |
Дата | |
Msg-id | 1263983585.4043.1657.camel@ebony обсуждение исходный текст |
Ответ на | Re: An example of bugs for Hot Standby (Andres Freund <andres@anarazel.de>) |
Ответы |
Re: An example of bugs for Hot Standby
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Список | pgsql-hackers |
On Wed, 2010-01-20 at 11:04 +0100, Andres Freund wrote: > On Wednesday 20 January 2010 10:52:24 Simon Riggs wrote: > > On Wed, 2010-01-20 at 10:45 +0100, Andres Freund wrote: > > > LWLockAcquire > > > > I'm using spinlocks, not lwlocks. > CancelDBBackends which is used in SendRecoveryConflictWithBufferPin which in > turn used by CheckStandbyTimeout triggered by SIGALRM acquires the lwlock. Those are used in similar ways to deadlock detection. > Now that case is a bit less dangerous because you would have to interrupt > yourself to trigger a deadlock there because the code sleeps soon after > setting up the handler. > If ever two SIGALRM occur consecutive there is a problem. I'll protect against subsequent calls. -- Simon Riggs www.2ndQuadrant.com
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