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From Randall Leeds <randall.le...@gmail.com>
Subject Re: associating UUIDs to DBs
Date Tue, 02 Feb 2010 19:48:19 GMT
On Tue, Feb 2, 2010 at 11:39, Chris Anderson <jchris@apache.org> wrote:
> On Tue, Feb 2, 2010 at 11:25 AM, Randall Leeds <randall.leeds@gmail.com> wrote:
>> I'm not entirely happy with this patch and I'd like some help figuring
>> out what to do about it.
>>
>> I foresee problems when database files are copied or backed up on
>> disk. It's possible to end up with two couchdb instances hosting
>> databases with the same uuid. The problem is that the uuid is no
>> longer meaningful, as it doesn't do what it was intended to (uniquely
>> identify the database).
>>
>> Can anyone see a way around this?
>>
>
> I think we don't mind this. As I mentioned above, when we see that 2
> db files have the same uuid we can do a fast-forward replication by
> starting from the lower of the 2 dbs sequence #s for replication.
> (maybe... Adam, does this sound sane?)

If changes had been made to both dbs separately then the lower
sequence # might be beyond the sequence number at which the histories
diverged and the changes to the "younger" db would be lost.

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