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From Alan Conway <acon...@redhat.com>
Subject Re: [c++ cluster] User doc for persistent clusters.
Date Fri, 11 Dec 2009 21:35:16 GMT
On 12/11/2009 03:59 PM, Sandy Pratt wrote:
>> -----Original Message-----
>> From: Alan Conway [mailto:aconway@redhat.com]
>> Sent: Tuesday, November 24, 2009 7:56 AM
>> To: Jonathan Robie; qpid-dev-apache
>> Subject: [c++ cluster] User doc for persistent clusters.
>> I put up a user view of the peristent cluster changes, coming soon.
>> Would
>> appreaciate any feedback on the doc or the feature it describes.
>> http://cwiki.apache.org/confluence/display/qpid/Persistent+Cluster+Rest
>> art+Design+Note
> Hi Alan,
> Looks like a great step forward for clustering.  Any hints on what's involved in the
manual intervention to enable restart from a full cluster crash?  I'm eager to kick the tires.

Basically it amounts to picking the "best" store and marking it clean by putting 
a UUID in <data_dir>/cluster/shutdown.uuid, i.e. pretend it was shut down cleanly.

I'm working on providing some help to identify the "best" store and ultimately 
hope to provide a tool for doing all this a bit more automatically. It will 
probably mean running the tool on the data-directory of each cluster member 
initially which is a pain - assumes remote logins or shared file systems.

I'd like to find a way to do this from one location without assuming shared 
filesystems or remote logins. There was a suggestion that if there's a total 
faliure the brokers come up in "admin mode" where they don't accept any clients 
except an admin tool. The brokers would collect the info needed to pick the 
clean store and mark it clean driven remotely by the admin tool. Does this sound 
like a good direction, or do you have any other suggestions on how to approach this?

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