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Re: [libvirt] [PATCH 3/3] gluster: Fix "key" attribute for gluster volumes



On 02/25/2014 03:36 AM, Peter Krempa wrote:

> The problem you are describing here is that two different keys may map
> to a single volume. The issue I'm trying to solve is that one key may
> map to two distinct volumes.
> 
> As a first step we should thus clarify which way the key should be unique.
> 
> If we want to make sure the mapping is always just 1:1, we might want to
> choose the gluster volume UUID as the first part of the key instead of
> the name.

That actually sounds like a reasonable idea - if we are trying to ensure
that a key lookup will find exactly one volume across multiple pools,
then encoding the pool UUID into the volume key name seems reasonable.

> 
>> unique for some pools, but best effort for others, and not change what
>> we have already been outputting.  But if we DO keep this patch, you also
>> need to change the documentation that gives examples of gluster keys.

This is still true - we'd need to document the choice, as well as
mention that early implementations of gluster pools were buggy with
regards to key generation.  As it would be a bug fix, I think we can
still try to get this done in time for 1.2.2.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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