The title of your blueprint

Include the URL of your launchpad blueprint:

Introduction paragraph – why are we doing anything?

Driver description

A detailed description of the driver.

Proposed change

Here is where you cover the change you propose to make in detail. How do you propose to solve this problem?

If this is one part of a larger effort make it clear where this piece ends. In other words, what’s the scope of this effort?

What are the driver’s guarantees in terms of reliability?

“Zaqar aims to be a fully-reliable service, therefore messages should never be lost under any circumstances except for when the message’s expiration time (ttl) is reached…”

What are the driver’s guarantees in terms of scalability?

Zaqar aims to be an easily scalable service. Zaqar provides an easy way to scale web-heads and to balance queue’s load across several different storage clusters. However, the real scalability is provided by the storage itself. If the storage can’t be unlimitedly scaled or it’s hard to scale, it’ll break this guarantee. Supported storage must be good for general use-cases and easy to scale unlimitedly. It’s fine to have storage drivers for very specific use-cases but it’s likely not going to be possible to maintain those drivers.

What are the driver’s guarantees in terms of interoperability?

In order for applications to easily talk to different clouds supporting Zaqar, it is necessary for the service to guarantee interoperability as much as possible. Lots of the interoperability guarantees depend on how the service itself is deployed. However, the team strives to provide an interoperable service and guide operators on what the best way to deploy the service is.

What are the driver’s guarantees in terms of openness?

Zaqar is an open-source software licensed under the Apache 2 license. It aims to be able to be installed in any deployments and circumstances. In order to do that, it tries to support technologies that will alow deployers to do so without any constraint. In order for the team to be able to maintain and support a storage driver, the driver has to be licensed under an open license and so has to be the technology the driver supports. The team won’t be able to maintain drivers relying on closed technologies that cannot be tested/deployed.



Who is leading the writing of the code? Or is this a blueprint where you’re throwing it out there to see who picks it up?

If more than one person is working on the implementation, please designate the primary author and contact.

Primary assignee:

<launchpad-id or None>

Can list additional ids if they intend on doing substantial implementation work on this blueprint.


Target Milestone for completion:


Work Items

Work items or tasks – break the feature up into the things that need to be done to implement it. Those parts might end up being done by different people, but we’re mostly trying to understand the timeline for implementation.


  • Include specific references to specs and/or blueprints in zaqar, or in other projects, that this one either depends on or is related to.


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