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From Jan Lehnardt <...@apache.org>
Subject Re: Erlang vs Scala
Date Mon, 13 Apr 2009 10:33:06 GMT

On 9 Apr 2009, at 06:10, Devendra Gera wrote:

> On Thu, 09 Apr 2009, Elliot Murphy wrote:
>
>> On 04/09/2009 12:10 AM, Devendra Gera wrote:
>>> I recently developed a CouchDB imitation in python for testing,  
>>> while I
>>> was working on the document update notifications patch. Maybe I  
>>> can put
>>> some effort into porting it to C?
>>>
>>> It was a purely in-memory store though.
>>
>> Does it faithfully reproduce the CouchDB interface and behavior? I  
>> would
>> *love* to have something a bit lighter weight than a full blown  
>> couchdb
>> instance for use by tests in our test suite.
>
> Umm, no. :)
>
> It does a subset. Some differences are :
>
> - No DELETEs : should be trivial to add.
>
> - Only one DB : should be extremely simple to extend.
>
> - No document revisions : shouldn't be too much effort.
>
> - Non-random (sequential) document IDs.
>
> - Single threaded : should be easy to fix, but would add locking
>   requirements and make the code more complex.
>
> - No thought to replication : I don't know how difficult this would be
>   to fix.
>
> - It does support the doc update hooks though (not as a process, but  
> as
>   python functions it loads from specified modules).
>
> - No persistence.
>
> - Stores the docs in a simple dict. Same for attachments.
>
> Note that this was done as a quick solution to develop the rest of the
> system, providing a functional substitute for CouchDB for rapid
> development. This was with ~280 lines of Python code.
>
> I have a bunch of unit tests (adding docs, adding attachments etc.)
> which test for CouchDB like behaviour. I didn't bother to add negative
> tests though.


I'm sure if you put it up on Github, there are some folks who help
to add the missing pieces. :)

Cheers
Jan
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