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From "Klaus Trainer (JIRA)" <>
Subject [jira] Updated: (COUCHDB-902) Attachments that have recovered from conflict do not accept attachments.
Date Sun, 17 Oct 2010 17:09:23 GMT


Klaus Trainer updated COUCHDB-902:

    Attachment: 0001-Fixes-COUCHDB-902.patch

After some debugging, I found out that the difference between an ordinary update and an update
with attachment was that in the former case the doc only contained the most current rev in
#doc.revs, whereas in the latter case, all revs were contained in #doc.revs.

This is because in the latter case case, the document is retrieved with couch_db:open_doc_revs/4,
whereas in the former case, the doc record is constructed using couch_httpd_db:couch_doc_from_req/3.

If all revs are included in #doc.revs (instead of only the latest one), the merge* functions
in couch_key_tree will come to the conclusion that there's a conflict. As I didn't see anything
wrong with the merge* functions, I assume that the flaw lies in including more than the latest
rev in #doc.revs.

Attached is a patch that fixes the issue and provides corresponding tests as well. Testing
with make check and the Futon tests suggests that everything is fine with it.

> Attachments that have recovered from conflict do not accept attachments.
> ------------------------------------------------------------------------
>                 Key: COUCHDB-902
>                 URL:
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Database Core
>         Environment: trunk
>            Reporter: Paul Joseph Davis
>            Priority: Critical
>         Attachments: 0001-Fixes-COUCHDB-902.patch,
> Apparently if a document has been in a conflict, they will reject requests to add an
attachment with a conflict error.
> I've tracked this down to couch_db_updater.erl line 501, but I'm not too familiar with
this part of the code so I figured I'd fill out a ticket in case anyone else can go through
this more quickly than me.
> Sure would be nice if I could attach a file when I create an issue...

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