Open Stack

Rather than adding debug statements could we please add additional notification events (for example a notification event whenever task_state changes)

Anyone that want's log file entries could then use the log_notifier, but those that want to get information like this back into a central system can then use rabbit_notifier.    

Maybe we need some way of configuring filters on the notifier stream for those that want to decide which events should be logged, sent to MQ, or ignored altogether.

Phil   

-----Original Message-----
From: openstack-bounces+philip.day=hp.com at lists.launchpad.net [mailto:openstack-bounces+philip.day=hp.com at lists.launchpad.net] On Behalf Of Jay Pipes
Sent: 29 June 2012 18:47
To: Huang Zhiteng
Cc: openstack at lists.launchpad.net
Subject: Re: [Openstack] Nova and asynchronous instance launching

On 06/29/2012 04:25 AM, Huang Zhiteng wrote:
> Sound like a performance issue.  I think this symptom can be much 
> eased if we spend sometime fixing whatever bottleneck causing this 
> (slow AMQP, scheduler, or network)?  Now that Nova API has got 
> multprocess enabled, we'd move to next bottleneck in long path of 
> 'launching instance'.
> Devin, is it possible that you provide more details about this issue 
> so that someone else can reproduce it?

Actually, Vish, David Kranz and I had a discussion about similar stuff on IRC yesterday. I think that an easy win for this would be to add much more fine-grained DEBUG logging statements in the various nova service pieces -- nova-compute, nova-network, etc. Right now, there are areas that seem to look like performance or locking culprits (iptables save/restore for example), but because there isn't very fine-grained logging statements, it's tough to say whether:

a) A process (or greenthread) has simply yielded to another while it waits for something

b) A process is doing something that is blocking

or

c) A process is doing some other work but no log statements are being logged about that work, which makes it seem like some other work is taking much longer than it really is

This would be a really easy win for a beginner developer or someone looking for something to assist with -- simply add informative
LOG.debug() statements at various points in the API call pipelines

Best,
-jay

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