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From "Klaus Trainer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-902) Attachments that have recovered from conflict do not accept attachments.
Date Sat, 16 Oct 2010 19:42:22 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921743#action_12921743
] 

Klaus Trainer commented on COUCHDB-902:
---------------------------------------

I've figured out what the actual problem here is.

========================================================================
Deleting conflicts on database two:
========================================================================
GET - /two/test?conflicts=true - "some plain text"
200 - {"_id":"test","_rev":"2-871d61d84063e8fc02d64acbcdaad8ba","foo":3,"_conflicts":["2-2ee767305024673cfb3f5af037cd2729"]}

DELETE - /two/test?rev=2-2ee767305024673cfb3f5af037cd2729 - 
200 - {"ok":true,"id":"test","rev":"3-89c964c5556795ee0fc45fd5213013b4"}

========================================================================
Attaching to document without conflicts on database two:
========================================================================
GET - /two/test - "some plain text"
200 - {"_id":"test","_rev":"2-871d61d84063e8fc02d64acbcdaad8ba","foo":3}

PUT - /two/test/some_attachment?rev=2-871d61d84063e8fc02d64acbcdaad8ba - some plain text
409 - {"error":"conflict","reason":"Document update conflict."}


The problem is that when deleting the conflicting revision 2-2ee767305024673cfb3f5af037cd2729,
just a new revision 3-89c964c5556795ee0fc45fd5213013b4 (with "_deleted":true) is created.
The old revision 2-871d61d84063e8fc02d64acbcdaad8ba (that's not been deleted) is now in a
kind of "deleted conflict" state with it. That is, updating revision 2-871d61d84063e8fc02d64acbcdaad8ba
would create a new revision that's in conflict with the deleted one.

You can check this e.g. with

curl -X GET http://127.0.0.1:5984/two/test?deleted_conflicts=true
{"_id":"test","_rev":"2-871d61d84063e8fc02d64acbcdaad8ba","foo":3,"_deleted_conflicts":["3-89c964c5556795ee0fc45fd5213013b4"]}

The actual problem here is that when updating a document with an attachment, deleted conflicts
are treated like normal conflicts. Supposably there's an easy solution to that issue.

> Attachments that have recovered from conflict do not accept attachments.
> ------------------------------------------------------------------------
>
>                 Key: COUCHDB-902
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-902
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Database Core
>         Environment: trunk
>            Reporter: Paul Joseph Davis
>            Priority: Critical
>         Attachments: couchdb-902-test-case.py
>
>
> 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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