[Gluster-devel] Introducing a new option to gluster peer command.

Joe Julian joe at julianfamily.org
Fri Apr 4 00:30:05 UTC 2014

Targeted for 4.0? Scripts are already written with the expectation that 
the probe command works a certain way and changes to the cli will break 
that compatibility. Major version changes, at least, do come with a 
certain level of backward compatibility loss.

On 4/3/2014 4:57 PM, Paul Cuzner wrote:
> I like the idea of making the CLI more semantically correct. ie to 
> drop a node from a cluster we use the term detach, so to add a node it 
> should be attach.
> Would a peer probe then be more of a diagnostic command ?
> - ie return whether 24007 is open, perform initial handshake - 
> determine gluster version and report back to the admin?
> This would mean that you could make intelligent decisions about 
> bringing nodes into the cluster from the automation platform.
> ------------------------------------------------------------------------
>     *From: *"Nagaprasad Sathyanarayana" <nsathyan at redhat.com>
>     *To: *"James" <purpleidea at gmail.com>
>     *Cc: *gluster-devel at nongnu.org
>     *Sent: *Tuesday, 1 April, 2014 6:01:42 PM
>     *Subject: *Re: [Gluster-devel] Introducing a new option to gluster
>     peer        command.
>     On 04/01/2014 08:23 AM, James wrote:
>         On Mon, Mar 31, 2014 at 10:29 PM, Nagaprasad Sathyanarayana
>         <nsathyan at redhat.com>  wrote:
>             In the current design, gluster peer probe does the job of both probing the
>             server and adding it to trusted pool. Once the server is added to trusted
>             pool, it can be detached usingpeer detach command.
>             Wondering if it makes sense to bring in gluster peer attach command to add
>             the server to trusted pool. The peer probe command will only prove the
>             server mentioned and tells if it is reachable. It can also be enhanced to do
>             some diagnostics such as probing specific ports.
>         Do I understand correctly:
>         gluster peer attach would attach the probing server into the pool it
>         is probing, correct?
>         If so, and if it is already a member of a pool, could you join two
>         different pools together?
>         I don't know what the gluster internals implications are, but as long
>         as I understand this correctly, then I think it would benefit the
>         management side of glusterfs.
>         It would certainly make peering more decentralized, as long as double
>         peering or running a simultaneous peer attach and peer probe don't
>         cause issues. This last point is very important :)
>         Cheers,
>         James
>     The "gluster peer attach" should work the same way as existing
>     "gluster peer probe". The new "gluster peer probe" shall only
>     probe the peer and not add it to the trusted pool.  When we give
>     /peer detach/ option, I think it would be natural to expect a
>     /peer attach/ command.
>     Thanks
>     Naga
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