Open Stack

On 09/18/2013 10:40 PM, Fei Long Wang wrote:
> Hi Sandy,
> 
> Thanks for the clear explanation. Another question, you mentioned that
> "One project recently ran into this problem when they were generating
> non-dict payloads on exceptions. ", would you mind telling me more about
> the problem? Since Glance is reviewing a similar patch. Thanks. I guess
> another project is consuming the malformed notification and got a
> failure, is it?

Cool!

Actually that patch is a fix from our team. :) We ran into it in
StackTach, but it would affect Ceilometer as well. The assumption is
that the payload is a dict and getting something different was breaking
things.

Cheers!
-S

> 
> Thanks & Best regards,
> Fei Long Wang (王飞龙)
> ---------------------------------------------------------------------
> Tech Lead of Nitrogen (SME team)
> Cloud Solutions and OpenStack Development
> Tel: 8610-82450513 | T/L: 905-0513
> Email: flwang at cn.ibm.com
> China Systems & Technology Laboratory in Beijing
> ---------------------------------------------------------------------
> 
> 
> Inactive hide details for Sandy Walsh ---09/18/2013 08:43:03 PM---On
> 09/18/2013 04:49 AM, Fei Long Wang wrote: > Hi Sandy,Sandy Walsh
> ---09/18/2013 08:43:03 PM---On 09/18/2013 04:49 AM, Fei Long Wang wrote:
>> Hi Sandy,
> 
> From: Sandy Walsh <sandy.walsh at rackspace.com>
> To: Fei Long Wang/China/IBM at IBMCN,
> Cc: "openstack at lists.openstack.org" <openstack at lists.openstack.org>
> Date: 09/18/2013 08:43 PM
> Subject: Re: [Openstack] Notification Usage in OpenStack ... a report card
> 
> ------------------------------------------------------------------------
> 
> 
> 
> 
> 
> On 09/18/2013 04:49 AM, Fei Long Wang wrote:
>> Hi Sandy,
>>
>> It's an awesome post. Just some minor questions.
> 
> Thanks!
> 
>> 1. Are you aware of any project is using Oslo.Messaging? Actually, just
>> like you know, the porting of Glance Oslo notifier is pending. And the
>> main reason is Oslo.Messaging is coming.
> 
> Daniel answered this, but yes, the intention is to move to oslo.messaging.
> 
> Notifications are different than the olso rpc mechanism in a couple of ways:
> 
> 1. they support requeue semantics. We can push notifications back on the
> queue if the consumer can't deal with it.
> 
> 2. they don't require a method with parameters on the consuming end. The
> consumer can just pull the notification off the queue and work on it.
> It's just a blob of data.
> 
> 3. Later, we'll likely want to support dead-letter queues for
> notifications that could not be processed. We don't want to lose these
> messages.
> 
> So long as this is supported in Messaging, we're fine.
> 
>> 2. You mentioned that Glance implement the audit partially, could you
>> please explain more from your point of view? Thanks.  
> 
> The "Importance of Usage Notifications" section sort of addresses this.
> For billing purposes there should ideally be two notifications emitted.
> The first would be the individual notifications for each billable action
> (these could be incremental updates) and the second would be a summary
> notification to indicate what the image or tenant cost for the day.  The
> consumer could then verify that the incremental notifications and the
> end-of-day summary matches.
> 
> Glance only supports the incremental notifications currently, iirc.
> 
> I think the image transfers are the only real billable event in Glance
> right now. Not sure if image storage (snapshots for backup) would be
> another.
> 
> Hope it helps!
> -S
> 
> 
>>
>> Thanks & Best regards,
>> Fei Long Wang (王飞龙)
>> ---------------------------------------------------------------------
>> Tech Lead of Nitrogen (SME team)
>> Cloud Solutions and OpenStack Development
>> Tel: 8610-82450513 | T/L: 905-0513
>> Email: flwang at cn.ibm.com
>> China Systems & Technology Laboratory in Beijing
>> ---------------------------------------------------------------------
>>
>>
>> Inactive hide details for Sandy Walsh ---09/17/2013 02:27:00 AM---Hey
>> y'all! I took a little time to review most of the OpenStaSandy Walsh
>> ---09/17/2013 02:27:00 AM---Hey y'all! I took a little time to review
>> most of the OpenStack projects and check on their notifica
>>
>> From: Sandy Walsh <sandy.walsh at RACKSPACE.COM>
>> To: "openstack at lists.openstack.org" <openstack at lists.openstack.org>,
>> Date: 09/17/2013 02:27 AM
>> Subject: [Openstack] Notification Usage in OpenStack ... a report card
>>
>> ------------------------------------------------------------------------
>>
>>
>>
>> Hey y'all!
>>
>> I took a little time to review most of the OpenStack projects and check
>> on their notification support. Happy to say, adoption is good. There are
>> things we could do better, but overall very positive.
>>
>> The article also talks a little about what makes for good notification
>> support. Something for you all to think about at the Icehouse summit :)
>>
>> I'm sure I've made some mistakes along the way, so please let me know
>> and I'll fix accordingly.
>>
>>
> http://www.sandywalsh.com/2013/09/notification-usage-in-openstack-report.html
>>
>> Look forward to your feedback!
>>
>> -Sandy
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> 
>