| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | Marko Tiikkaja <marko(at)joh(dot)to>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-bugs(at)postgresql(dot)org> |
| Subject: | Re: BUG #14830: Missed NOTIFications, PostgreSQL 9.1.24 |
| Date: | 2017-10-10 14:54:26 |
| Message-ID: | 18082.1507647266@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
I wrote:
> ... I'm a bit hesitant to put a GetSnapshotData
> call into ProcessIncomingNotify, because of the possibility of adding a
> lot of contention on the ProcArray if there's very heavy notify traffic.
Wait, I have an idea. Let's fetch a snapshot at the top of
ProcessIncomingNotify, and then use the snapshot to decide whether
xids are running, instead of calling TransactionIdIsInProgress.
GetSnapshotData is probably a bit heavier than a single
TransactionIdIsInProgress call, but if we have to process multiple
messages then this should be a net savings in ProcArray traffic.
regards, tom lane
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