From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | josh(at)agliodbs(dot)com |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <mha(at)sollentuna(dot)net>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Function to kill backend |
Date: | 2004-04-06 19:36:35 |
Message-ID: | 200404061936.i36JaZo00654@candle.pha.pa.us |
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Thread: | |
Lists: | pgsql-hackers |
Josh Berkus wrote:
> Bruce,
>
> > OK, you have a runaway report. You want to stop it. Query cancel is
> > only going to stop the current query, and once you do that the next
> > query is fed in so there is no way to actually stop the report,
> > especially if the report is not being run from the same machine as the
> > server (you can't kill the report process). How do you stop it without
> > SIGTERM? You don't want to shut down the postmaster.
>
> Hmmm ... but, at least in the case of my apps, killing the PG connection
> wouldn't fix things. Most apps I work on are designed to detect connection
> failure and reconnect. I suspect that most platforms that use connection
> pooling are the same. So your case would only work if you actually blocked
> all connections from that host -- not a capability we'd discussed.
I don't think most apps reconnect on disconnect, except maybe pooled
connections where you don't expect your state to be stable between
connections. Certainly most reports can't just reconnect and keep
going.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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