amqp-relation-changed hook never runs

[Kapil Thangavelu]

Afaics, the problem seems to some pathlogical behavior in one of the
scripts used by the charm. The db-relation-changed hook runs this script

http://paste.ubuntu.com/1391878/

which ends up spinning indefinitely and using significant cpu (40-60%). an
strace shows repeated connect/describe column family attempts

http://paste.ubuntu.com/1391826/

i manually verified the crashdb cassandra table is present. The rest of the
system is in a good steady state. Killing this spinning script, and the
rest of the amqp relation hooks (-joined, -changed) run normally.

hth,

Kapil


On Tue, Nov 13, 2012 at 9:38 AM, Evan Dandrea <evan.dandrea at canonical.com>wrote:

> Hi,
>
> I'm having difficulty getting two charms talking to AMQP at once. When
> I run the following deployment script, the "daisy-retracer" charm
> successfully runs both the amqp-relation-joined hook and the
> amqp-relation-changed-hook.
>
> The "daisy" charm, however, only seems to run the amqp-relation-joined
> hook. While the amqp-relation-changed hook shows up in the logs with
> "unit.relation.lifecycle at DEBUG: Executing hook amqp-relation-changed",
> I do not see the "hook.executor at DEBUG: Running hook:
> /var/.../amqp-relation-changed" message that's present in the log for
> the "daisy-retracer" charm.
>
> Inserting "juju-log $(basename $0)" into the relation-changed hook
> never produces amqp-relation-changed in the charm.log file, probably
> confirming that it's never run.
>
> Does anyone have suggestions of what my next steps should be in
> debugging this, or have any idea why this might be happening?
>
> The aforementioned deployment script can be bootstrapped and run with
> the following commands:
>
> mkdir -p ~/bzr/precise
> bzr branch lp:~ev/charms/precise/daisy-retracer/trunk
> ~/bzr/precise/daisy-retracer
> bzr branch lp:~ev/charms/precise/daisy/trunk ~/bzr/precise/daisy
> bzr branch lp:~ev/charms/precise/errors/trunk ~/bzr/precise/errors
> bzr branch lp:~ev/+junk/whoopsie-daisy-deployment
> ~/bzr/whoopsie-daisy-deployment
> ~/bzr/whoopsie-daisy-deployment
>
> Thanks
>
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