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From Brian Candler <B.Cand...@pobox.com>
Subject Re: Restricting user interactions to a single document -- was [VOTE] Apache CouchDB 0.9.0 release
Date Thu, 02 Apr 2009 15:44:45 GMT
On Wed, Apr 01, 2009 at 09:05:37AM +1030, Antony Blakey wrote:
>
> On 31/03/2009, at 11:14 PM, Brian Candler wrote:
>
>> Perhaps you want some sort of lock manager, whereby a client can  
>> request a
>> lock on a group of documents, perform an update, then release the  
>> lock?
>
> Then you need deadlock detection due to ordering of lock acquisition.  
> Better to use the higher level concept of an atomic _bulk_docs.

Yeah, but CouchDB [TM] doesn't have that, so I'm suggesting an alternative.

There are plenty of simple algorithms to avoid lock ordering problems. If I
remember correctly, I think that just sorting the doc_ids you're interested
in and grabbing them in ascending order should be sufficient.

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