Re: Running function automatically on (unclean) disconnect

From: Tomasz Ostrowski <tometzky(at)batory(dot)org(dot)pl>
To: Stumo <stumo(at)stumo(dot)org(dot)uk>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Running function automatically on (unclean) disconnect
Date: 2008-03-25 09:11:48
Message-ID: 47E8C1D4.5010808@batory.org.pl
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general

Stumo wrote:

> Each client retrieves an unprocessed record from the server, marks
> that it's processing that record, does some processing (this will take
> some time), and adds some extra data to the server based on the
> processing. [snip]
>
> However, if a client disconnects (which, because of the system I am
> using, is relatively likely) then the record will still be marked as
> processing even though nothing is processing it.

Just create a timeout for processing - if a worker process will fail or
disconnect then a job will time out. Choose jobs for processing from
jobs in not-processed or timed-out state. It is much more reliable -
will work even when backend or server will die or when a worker will hang.

Regards
Tometzky
--
...although Eating Honey was a very good thing to do, there was a
moment just before you began to eat it which was better than when you
were...
Winnie the Pooh

In response to

Browse pgsql-general by date

  From Date Subject
Next Message Magnus Hagander 2008-03-25 09:19:41 Re: Install Postgresql on Win2000 with Admin Rights
Previous Message sathiya psql 2008-03-25 08:51:20 postgresql is slow with larger table even it is in RAM