| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Tatsuo Ishii <ishii(at)postgresql(dot)org> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Is LISTEN/NOTIFY reliable? |
| Date: | 2010-10-16 13:48:07 |
| Message-ID: | 6074.1287236887@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Tatsuo Ishii <ishii(at)postgresql(dot)org> writes:
> Does anybody know PostgreSQL LISTEN/NOTIFY is more reliable than
> previous versions? I vaguely recall that in the previous
> implementation, message sent by NOTIFY may not be reached to listner.
> Does PostgreSQL 9.0's new implementation guarantee that the message is
> received by the listener?
No more or less than the old one did.
The old design intentionally dropped duplicate notifications, and the
new one does too (though with a narrower definition of "duplicate").
Modulo that well-documented behavior, I know of no reason to describe
either the old or new code as unreliable.
regards, tom lane
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