[jira] [Created] (COUCHDB-3353) _bulk_docs incorrectly creates missing documents instead of returning conflict

["Jonathan Hall (JIRA)" <ji...@apache.org>]

Jonathan Hall created COUCHDB-3353:
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             Summary: _bulk_docs incorrectly creates missing documents instead of returning conflict
                 Key: COUCHDB-3353
                 URL: https://issues.apache.org/jira/browse/COUCHDB-3353
             Project: CouchDB
          Issue Type: Bug
            Reporter: Jonathan Hall


If I attempt to update a missing document via the _bulk_docs endpoint with curl, using a single doc, everything works as expected:

    curl -v -X POST http://admin:abc123@localhost:6001/foo/_bulk_docs -H "Content-Type: application/json" -d '{"docs":[{"_id":"bogus","_rev":"4-asb"}]}'

returns:

    [{"id":"bogus","error":"conflict","reason":"Document update conflict."}]

But if I include a second valid doc (creating one in this example):

    curl -v -X POST http://admin:abc123@localhost:6001/foo/_bulk_docs -H "Content-Type: application/json" -d '{"docs":[{"name":"Bob"},{"_id":"bogus","_rev":"4-asb"}]}'

I occasionally get the expected result:

    [{"ok":true,"id":"0b7b7e409a37ccb8dcf89165ee74e429","rev":"1-5a26fa4b20e40bc9e2d3e47b168be460"},{"id":"bogus","error":"conflict","reason":"Document update conflict."}]

And I occasionally get that _both_ docs are created (!!!):

    [{"ok":true,"id":"0b7b7e409a37ccb8dcf89165ee760150","rev":"1-5a26fa4b20e40bc9e2d3e47b168be460"},{"ok":true,"id":"bogus","rev":"5-19d41415e604c9e24813778b745f9407"}]

I noticed this while unit testing, where it was failing more often than succeeding, but I'm able to reproduce from the command line if I repeat the command quickly enough.

This makes me think there's some kind of race condition--if an early iteration hasn't finished (doing something), a repeated query may result in the document being erroneously created.



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