Re: CSStorm occurred again by postgreSQL8.2

Tom Lane wrote:
> I wrote:
> > I see a bug though, which is that RecordSubTransactionAbort() calls
> > GetCurrentTransactionId() before having verified that it needs to do
> > anything. This means that we'll generate and then discard an XID
> > uselessly in a failed subxact that didn't touch disk.
>
> Well, it would be a bug except that RecordSubTransactionAbort isn't
> called unless the current subxact has an XID. Perhaps a comment would
> be appropriate but there's nothing to fix here.
>
> I think Theo's problem is probably somewhere else, too --- apparently
> it's not so much that TransactionIdIsCurrentTransactionId takes a long
> time as that something is calling it lots of times with no check for
> interrupt.

Could it be something like heap_lock_tuple? It calls MultiXactIdWait,
which calls GetMultXactIdMembers and TransactionIdIsCurrentTransactionId
on each member. (heap_update and heap_delete do the same thing). I
must admit I didn't read Theo's description on his scenario though.

--
Alvaro Herrera http://www.CommandPrompt.com/
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