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Posted to user@couchdb.apache.org by Hermann Norpois <hn...@gmail.com> on 2015/07/02 12:19:01 UTC

parsing json

Hello,

how does couchdb parse the json-documents? Which tool is used? Is it a
known library or is it a couchdb built in function?
Thanks
Hermann

Re: parsing json

Posted by Jan Lehnardt <ja...@apache.org>.
> On 05 Jul 2015, at 05:09, Adam Kocoloski <ko...@apache.org> wrote:
> 
>> On Jul 2, 2015, at 6:23 AM, Jan Lehnardt <ja...@apache.org> wrote:
>> 
>> 
>>> On 02 Jul 2015, at 12:19, Hermann Norpois <hn...@gmail.com> wrote:
>>> 
>>> Hello,
>>> 
>>> how does couchdb parse the json-documents? Which tool is used? Is it a
>>> known library or is it a couchdb built in function?
>> 
>> We use https://github.com/apache/couchdb-jiffy a C-implementation of a JSON
>> parser.
>> 
>> Although there is now a discussion to move back to mochijson2, which is
>> native Erlang: https://issues.apache.org/jira/browse/COUCHDB-2732
>> 
>> Best
>> Jan
>> —
> 
> (moving to dev@)
> 
> Hiya Jan, we could be discussing a jiffy -> mochijson2 switch, but that’s not the topic of COUCHDB-2732. The issue there is the locking required by the NIF we use for JSON _collation_, which is something Filipe wrote for us back in COUCHDB-1186.
> 
> On the topic of JSON collation, the findings by the IBM team are that pure Erlang collation outperforms the existing NIF, but that a NIF taking advantage of thread local storage is better still. Cheers,

I stand corrected, thanks Adam! :)


Jan
--

> 
> Adam

-- 
Professional Support for Apache CouchDB:
http://www.neighbourhood.ie/couchdb-support/

Re: parsing json

Posted by Adam Kocoloski <ko...@apache.org>.
> On Jul 2, 2015, at 6:23 AM, Jan Lehnardt <ja...@apache.org> wrote:
> 
> 
>> On 02 Jul 2015, at 12:19, Hermann Norpois <hn...@gmail.com> wrote:
>> 
>> Hello,
>> 
>> how does couchdb parse the json-documents? Which tool is used? Is it a
>> known library or is it a couchdb built in function?
> 
> We use https://github.com/apache/couchdb-jiffy a C-implementation of a JSON
> parser.
> 
> Although there is now a discussion to move back to mochijson2, which is
> native Erlang: https://issues.apache.org/jira/browse/COUCHDB-2732
> 
> Best
> Jan
> —

(moving to dev@)

Hiya Jan, we could be discussing a jiffy -> mochijson2 switch, but that’s not the topic of COUCHDB-2732. The issue there is the locking required by the NIF we use for JSON _collation_, which is something Filipe wrote for us back in COUCHDB-1186.

On the topic of JSON collation, the findings by the IBM team are that pure Erlang collation outperforms the existing NIF, but that a NIF taking advantage of thread local storage is better still. Cheers,

Adam

Re: parsing json

Posted by Jan Lehnardt <ja...@apache.org>.
> On 02 Jul 2015, at 12:23, Jan Lehnardt <ja...@apache.org> wrote:
> 
> 
>> On 02 Jul 2015, at 12:19, Hermann Norpois <hn...@gmail.com> wrote:
>> 
>> Hello,
>> 
>> how does couchdb parse the json-documents? Which tool is used? Is it a
>> known library or is it a couchdb built in function?
> 
> We use https://github.com/apache/couchdb-jiffy a C-implementation of a JSON
> parser.
> 
> Although there is now a discussion to move back to mochijson2, which is
> native Erlang: https://issues.apache.org/jira/browse/COUCHDB-2732

In addition: view results are serialised by SpiderMonkey’s native JSON.stringify();

Best
Jan
--
> 
> Best
> Jan
> --
> 
> 
>> Thanks
>> Hermann
> 
> -- 
> Professional Support for Apache CouchDB:
> http://www.neighbourhood.ie/couchdb-support/
> 

-- 
Professional Support for Apache CouchDB:
http://www.neighbourhood.ie/couchdb-support/

Re: parsing json

Posted by Jan Lehnardt <ja...@apache.org>.
> On 02 Jul 2015, at 12:19, Hermann Norpois <hn...@gmail.com> wrote:
> 
> Hello,
> 
> how does couchdb parse the json-documents? Which tool is used? Is it a
> known library or is it a couchdb built in function?

We use https://github.com/apache/couchdb-jiffy a C-implementation of a JSON
parser.

Although there is now a discussion to move back to mochijson2, which is
native Erlang: https://issues.apache.org/jira/browse/COUCHDB-2732

Best
Jan
--


> Thanks
> Hermann

-- 
Professional Support for Apache CouchDB:
http://www.neighbourhood.ie/couchdb-support/