[erlang-bugs] [erlang-questions] Weird pg2 behavior

Kenneth Lundin kenneth.lundin@REDACTED
Mon May 12 14:57:04 CEST 2008


pg2 is in deep need of systematic tests and a number of bugfixes (at
least the one
discussed here).

The status of pg2 is like that because the module has obviously not
been used much at all. The only use of pg2 within OTP is from disk_log
(the distributed
logs part which also is rarely used).

We can not promise when we will have time to improve the pg2 module, it does not
come very high up in our priority list.

What we can say is that it is a far better chance to get it fixed
sooner as part of an
OTP release if a patch
and test suite is provided by someone in the community.

/Regards Kenneth Erlang/OTP, Ericsson

On 5/8/08, Andy Gross <andy@REDACTED> wrote:
> We also use pg2 heavily in our production network, and are also
> interested in seeing a resolution to this bug.  It hasn't popped up in
> production yet, but when we moved offices we spent a couple of days
> trying to purge our pg2 groups of old, stale pids running on IP
> addresses from the old office space, to no avail.  Eventually each
> developer just switched cookies to prevent whatever rogue pg2 instance
> was poisoning the group membership.
> Could someone in-the-know describe the monitoring changes made to
> global mentioned below?   Would a patch from the community with a test
> suite be considered for inclusion in any R12-X release?
> - Andy
> On May 7, 2008, at 10:28 PM, Matthew Dempsky wrote:
> > Has there been any progress on this?  This bug bit us again today. :-(
> >
> > (A pid from a node on a machine that had been decommissioned and not
> > running any Erlang code for months now but still present on our
> > network was still lurking in one of our pg2 groups.  Yesterday we
> > finally repurposed this machine, removing it from our network, which
> > had the unexpected side effect of causing Pid ! Msg in some heavily
> > used code to start adding several seconds of delay due to the runtime
> > attempting to autoconnect to that long-dead node.)
> >
> > On Fri, Apr 18, 2008 at 1:23 AM, Matthew Dempsky
> > <matthew@REDACTED> wrote:
> >> On Wed, Apr 16, 2008 at 1:46 AM, Hans Bolinder
> >>
> >> <hans.bolinder@REDACTED> wrote:
> >>
> >>> I think pg2 should monitor all pids rather than link to local pids
> >>> only. Carefully setting up monitors, like Global does since R11B-4,
> >>> should work.
> >>
> >> Sounds good to me.  Can we hope to see this in R12B-3?  :-)
> >>
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