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Date: Sat, 20 Aug 2011 22:58:27 +0000 (UTC)
From: "Robert Newson (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
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Subject: [jira] [Commented] (COUCHDB-605) _update handler doesn't conflict
 for existing document
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    [ https://issues.apache.org/jira/browse/COUCHDB-605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088284#comment-13088284 ] 

Robert Newson commented on COUCHDB-605:
---------------------------------------

_update handlers do not allow you to ignore MVCC, the update can still fail with a real 409 if the doc is updated concurrently. All it's doing is giving you the current _rev value, but it's not performing any locking (there are no read or write locks in couchdb) so a successful update between the start of the update function and its return will cause the update handler to fail with 409.


> _update handler doesn't conflict for existing document
> ------------------------------------------------------
>
>                 Key: COUCHDB-605
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-605
>             Project: CouchDB
>          Issue Type: Bug
>    Affects Versions: 0.10
>         Environment: Ubuntu Karmic, in particular it's CouchDB version 0.10.0-0ubuntu3
>            Reporter: Sergey Shepelev
>            Assignee: Chris Anderson
>
> design doc:
> "updates": {
>        "hello": "function(doc, req) { doc.value = 100500; return [doc, 'foo bar']; }"
>    }
> $ curl -X PUT --data-binary @- http://localhost:5984/shkaf/client:foo << EOF
> > {"_id":"client:foo"}
> > EOF
> {"ok":true,"id":"client:foo","rev":"1-967a00dff5e02add41819138abb3284d"}
> $ curl -X PUT --data-binary @- http://localhost:5984/shkaf/_design/client/_update/hello/client:foo?A=B << EOF
> > {"_id": "client:foo"}
> > EOF
> foo bar
> And it really updated the document.
> What i expected here is error: conflict because document with such _id already existed and i didn't provide _rev to _update handler.

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