Open Stack

?Is it possible to write the functionality you desire in your own middleware for Swift that lives outside of the Swift code?  I would favor that approach for the following reasons:


* You would have more control over code/changes so your middleware could stabilize and mature faster (don't have to wait for reviews from community for minor tweaks).

* Since you are writing it, you get exactly what you want.

* Swift would not gain more dependancies that would have to be installed.


There have been a few projects in the past that have been successful middleware without being included (swauth, swift3, swift-informant).


And in the end, if your middleware becomes wildly successful and everybody uses it, there would be no reason it could not be merged into the Swift code at a later time.?


Thanks,
Richard Hawkins
Software Developer - Cloud Files (OpenStack Swift)
Rackspace



________________________________
From: Denis Egorenko <degorenko at mirantis.com>
Sent: Tuesday, December 1, 2015 3:47 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [swift] [oslo.messaging] [fuel] [ha] Is Swift going to support oslo.messaging?

Hello folks,

The issue I want to raise is related to Swift and Oslo.messaging. Currently Swift doesn't support oslo.messaging middleware. There is no possible to setup RabbitMQ HA setup in swift configuration, so we faced the problem [1] in Fuel. If we want to use Ceilometer notifications for Swift, we should use ceilometermiddleware. It provides possibility configure properly transport settings for notifications [2]. The main problem that Fuel uses HA RabbitMQ setup (mirrored queues) with direct connection from clients. The client uses oslo.messaging to establish the connection with one of rabbitmq servers. oslo.messaging uses heartbeats to switch to another RabbitMQ server if/when there are any network issues. However, Swift doesn't use oslo.messaging at all. It's possible to specify only one RabbitMQ server in swift configuration hence there can be problems if specified server is down or has network flapping issues. Alternative solution is to use VIP for RabbitMQ [3]. This setup is not perfect also as timeout and connection restore time is much worse.

So, the question is:

Is Swift going to support oslo.messaging and particularly rabbit_hosts?

[1] https://bugs.launchpad.net/fuel/+bug/1510064
[2] https://review.openstack.org/#/c/152273
[3] https://review.openstack.org/#/c/248147

--
Best Regards,
Egorenko Denis,
Deployment Engineer
Mirantis
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