Open Stack

Changbin Liu <changbin.liu at gmail.com> wrote on 02/05/2013 05:32:05 PM:

> Subject: Re: [openstack-dev] Nova workflow management update
> 
> Hi Joshua, 
> 
> Just to share some thoughts:
[...]

Using ZK makes a lot of sense.. The problem is that making ZooKeeper a 
mandatory component to support even basic workflow management might be an 
issue. So, the approach which seems to make most sense is to define 
abstract internal interfaces for the various capabilities that ZK can 
provide (distributed locking, leader election, etc), and then have one or 
more implementations (one of which might be based on ZK). This is the 
approach that has been taken for the membership service (service group 
monitoring APIs) -- introducing the flexibility to use ZK backend, but 
keeping the default to be DB-backed.

Regards,
Alex

P.S. thinking about this.. would it be possible to implement ZK APIs over 
a DB? with some limitations, perhaps..
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