| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Hiroyuki Yamada <yamada(at)kokolink(dot)net> |
| Subject: | Re: An example of bugs for Hot Standby |
| Date: | 2010-01-20 10:48:49 |
| Message-ID: | 201001201148.50054.andres@anarazel.de |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Wednesday 20 January 2010 11:33:05 Simon Riggs wrote:
> 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.
But only if
ImmediateInterruptOK && InterruptHoldoffCount == 0 && CritSectionCount == 0 -
which is not the case with HoldingBufferPinThatDelaysRecovery.
Andres
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Simon Riggs | 2010-01-20 11:59:40 | Re: Small locking bugs in hs |
| Previous Message | Simon Riggs | 2010-01-20 10:33:05 | Re: An example of bugs for Hot Standby |