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From Chad George <>
Subject Re: Write race conditions, working without _rev
Date Thu, 18 Nov 2010 01:56:37 GMT
I guess I was more wondering if its possible for two calls to the update
function to "see" the same revision of the document. Or if it was possible
for another call to document API to successfully update a document *while*
the update handler is processing?

Are you saying that all the processing of HTTP calls and related javascript
calls are all effectively serialized so this can't happen?

It seemed by Jan's comments that a _rev collision can occur with update

And maybe most importantly, when an update handler fails to write the
document what happens? I didn't see any tests for this in
update_documents.js but maybe I missed something.

On Wed, Nov 17, 2010 at 8:14 PM, Randall Leeds <>wrote:

> On Wed, Nov 17, 2010 at 16:15, Chad George <> wrote:
> > I've been wondering about this for a while, when two update requests for
> the
> > same document come to couchdb nearly simultaneously what exactly happens?
> >
> > Is it possible for both requests to get the same revision of the document
> to
> > update or is there some mechanism to force the updates to occur in
> series?
> >
> There is a mechanism. The message passing within the Erlang runtime
> guarantee an ordering of messages to the update process.
> It is impossible for both updates to occur.

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