[Xapian-devel] UUIDs for databases

[Richard Boulton]

Olly Betts wrote:
>>   - The replication protocol currently works by a client sending a 
>> message to the server saying "please give me the necessary updates to 
>> transform a database with a given UUID and a given revision number into 
>> a more recent version of the database".  Therefore, for efficient 
>> updates, the server needs to remember that the old revision number 
>> applied for databases before a particular revision number.
> 
> Do you mean "the old UUID" not "old revision number"?

Yes.

>> (3) is less important, because it would simply result in full-database 
>> copies occurring when changesets could be applied, leading to an 
>> efficiency drop, rather than corrupt databases.  However, it would be 
>> best to fix the changeset files to hold the information required before 
>> a release, even if we don't actually write the code to search through 
>> them if the database UUID doesn't match, so that incompatible changes 
>> aren't required to implement this in future.
> 
> I think this is only relevant if you're changing the UUID?

Yes, that's right.

-- 
Richard