Re: pg_listener in 9.0 - Mailing list pgsql-hackers

From Steve Singer
Subject Re: pg_listener in 9.0
Date
Msg-id 4DE6466B.6060309@ca.afilias.info
Whole thread Raw
In response to Re: pg_listener in 9.0  (Christopher Browne <cbbrowne@gmail.com>)
Responses Re: pg_listener in 9.0
List pgsql-hackers
On 11-06-01 09:30 AM, Christopher Browne wrote:
> On Wed, Jun 1, 2011 at 8:29 AM, Dave Page<dpage@pgadmin.org>  wrote:
>> On Wed, Jun 1, 2011 at 12:27 PM, Andrew Dunstan<andrew@dunslane.net>  wrote:
>>> The whole point of the revamp was that pg_listener was a major performance
>>> bottleneck and needed to go, and without it being gone we would not have got
>>> notification payloads.
>> Yeah, I know why it was replaced. That doesn't mean we cannot provide
>> an alternative interface to the same info though (other things might
>> of course).
>>
>>> I suspect you're pretty much out of luck.
>> Not me - our users.
> Note that in Slony 2.1, there's a table called sl_components, which is
> used to capture the state of the various database connections,
> checking in as the various threads do their various actions.
>
> Also, slon and slonik try to report their respective application, so
> it can be reported on pg_stat_activity.

Slony 2.1 also sets application_name.

If this were a big deal for pgAdmin we could consider backporting the 
application_name change to 2.0.x for users running against 9.0.

Slony also has a table called sl_nodelock that each slon process writes 
adds a row for on startup.  This includes the backend pid() for one of 
the connections.  Slony 1.2, 2.0 and 2.1 all use sl_nodelock




pgsql-hackers by date:

Previous
From: Merlin Moncure
Date:
Subject: Re: pg_listener in 9.0
Next
From: Tom Lane
Date:
Subject: Re: [COMMITTERS] pgsql: Improve corner cases in pg_ctl's new wait-for-postmaster-startup