Hey Ed,
I absolutely agree that we need to be confident that all requests will be
handled by the system eventually. However, I'm unsure of the need for a new
service to be created to handle error cases.
I'm not saying that we can solve every case through our current architecture,
but with some subtle tweaks I think it can be made much more reliable. I feel
like if we look at every place where errors *can* occur we can find solutions
not involving an external service. Are there any particular bugs/situations
that are happening which aren't listed as bugs in Launchpad?
Long story short I'd rather not create an external service which attempts to
clean up after poor exception handling / bad logic, but there might be some
cases I'm not considering.
Brian
-----Original Message-----
From: "Ed Leafe" <e...@leafe.com>
Sent: Friday, August 26, 2011 3:22pm
To: openstack@lists.launchpad.net
Subject: [Openstack] New nova service proposal
Sorry I haven't come up with a snazzy name for it yet, but what I have
in mind is a new service that is essential for my employer (Rackspace), and
might be important for other OpenStack deployments. This new service would be
completely optional, of course - only those for whom it is relevant would run
it.
Let me start by stating the problem: when a customer requests that we
create instances for them, nova casts those requests into the queue, where they
are eventually acted upon. That usually works great, but in cases where the
instance creation fails, we need to detect that failure and re-issue the create
request with a different host. This is currently not possible with the
asynchronous design of the compute-scheduler interactions.
So what I envision is a service that scans a list of recent requests'
reservation IDs, and follows up to see if the request was successful or not,
and takes action if needed. The blueprint for this can be found at
https://blueprints.launchpad.net/nova/+spec/instance-creation-assurance, with
an Etherpad created for ongoing idea exchange at
http://etherpad.openstack.org/instance-creation-assurance
-- Ed Leafe
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