Blocked thread

Larry Martell larry.martell at gmail.com
Thu Jul 17 20:03:26 CEST 2014


On Thu, Jul 17, 2014 at 2:01 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Jul 18, 2014 at 3:55 AM, Larry Martell <larry.martell at gmail.com> wrote:
>> I can have as many connections to the db server as I want, that's not
>> the issue. The issue is that my main thread seems to be blocked in the
>> join(), so I guess I'm going to need a separate script. I was trying
>> to avoid that.
>
> Right, but what you're trying to do is monitor the local thread, by
> spinning off a thread to do the deletion and then keeping an eye on it
> by attempting a timed join. I'm saying it'd probably be easier to do
> the monitoring on the server end, via a second connection. (It most
> likely doesn't need special database privileges, even; at least in
> PostgreSQL, any user can see pg_stat_activity entries for the same
> user.) That's usually going to be more reliable, plus the server can
> tell you whether the deletion is blocked waiting for a lock or busy
> writing to the disk or something else.

Yes, I agree, but the second connection will have to be in a second
script, not the main thread of the script I have.



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