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Re: mcollective restart required to add cartridge


We attempted in the beginning to make this work without a restart and had to resort to the restart as there were a number of issues with the MCO agent which led to the restart being the most consistent method of refreshing the in-memory index into the cartridge repository and copying the cartridges from their rpm home to the cartridge repository cache. The mco flag is an artifact of some of that work.

There was a trello card to a reload a "stale" cartridge repository, I no longer see it on the node boards.

No one has researched whether any of the issues were addressed with MCO 2.4.


----- Original Message -----
> From: "Luke Meyer" <lmeyer redhat com>
> To: "dev" <dev lists openshift redhat com>
> Sent: Tuesday, July 1, 2014 1:21:39 PM
> Subject: mcollective restart required to add cartridge
> I thought this worked differently, and I'm pretty disappointed. Wondering how
> hard it is to change.
> I thought, when you installed a new cartridge at the node with
> "oo-admin-cartridge --action install" that mcollective would pick it up
> right away. Thus you could do oo-admin-ctl-cartridge -c import-node from the
> broker and start using the cartridge without any service interruption.
> It appears not. Not sure how I got that impression. Instead, mcollective
> reports the cartridge repo loaded at the time it started. This seems like a
> bad design. Restarting mcollective should not be done needlessly. It can
> interrupt user activities and leave the state of mongo inconsistent with the
> state of nodes. Preferably that should only happen during a broker outage.
> But adding cartridges should be possible at any time.
> I understand we don't want the mcollective agent to reload the in-memory
> cartridge repo constantly, but this does not seem like a hard cache
> invalidation problem. Just have oo-admin-cartridge touch a file in the cart
> repo after installing, and have the mcollective agent store the timestamp
> and reload the cartridges when it changes.
> Am I incorrect about any of this? Seems a trello card is in order...
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