| From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Greg Sabino Mullane <greg(at)turnstep(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Notify enhancement |
| Date: | 2006-12-04 15:02:11 |
| Message-ID: | 45743873.1000901@dunslane.net |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
>
>> Alvaro Herrera wrote:
>>
>>> What will happen when the ring is full? NOTIFY blocks?
>>>
>>>
>> An error, I think, don't you? Blocking seems totally unacceptable.
>>
>
> That seems like a curious answer. Imagine the documentation:
> "NOTIFY may fail for no reason whatsoever." I'd vote for blocking.
> Otherwise, apps have to treat NOTIFY as an unreliable communication
> mechanism, which reduces its use-case to approximately nil.
>
>
>
OK, good point. I guess I'm a bit concerned about providing a possible
DOS vector, but it could be either way.
How about Alvaro's suggestion of spilling to disk?
cheers
andrew
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