Horton

Re: Listen / Notify rewrite

Merlin Moncure <mmoncure@gmail.com>

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From: Merlin Moncure <mmoncure@gmail.com>
To: Andrew Chernow <ac@esilo.com>
Cc: Greg Stark <gsstark@mit.edu>, Robert Haas <robertmhaas@gmail.com>, Josh Berkus <josh@agliodbs.com>, Tom Lane <tgl@sss.pgh.pa.us>, Joachim Wieland <joe@mcknight.de>, pgsql-hackers@postgresql.org, Andrew Chernow <andrew@esilo.com>
Date: 2009-11-13T15:13:45Z
Lists: pgsql-hackers 
On Fri, Nov 13, 2009 at 10:00 AM, Andrew Chernow <ac@esilo.com> wrote:
> I think the original OP was close.  The structure can still be fixed length
> but maybe we can bump it to 8k (BLCKSZ)?

The problem with this (which I basically agree with) is that this will
greatly increase the size of the queue for all participants of this
feature if they use the payload or not.  I think it boils down to
this: is there a reasonably effective way of making the payload
variable length (now or in the future)?  If not, let's compromise and
maybe go with a larger size, maybe 256 or 512 bytes.

merlin