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From "Paul Joseph Davis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1163) Document returned by id, but cannot be found by rev
Date Wed, 18 May 2011 02:55:47 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035180#comment-13035180
] 

Paul Joseph Davis commented on COUCHDB-1163:
--------------------------------------------

For posterity:

The key part that made sorting the paths by starting revision was to think of it as "always
merge paths in order of paths closest to the root of the abstract tree". I call it abstract
because after we stem far enough the 'tree' ends up becoming a set of trees paired with a
distance to the original root. Sorting paths so that we start out closest to root should guarantee
that we never inadvertently end up with a tree that has paths that could be merged together
which should theoretically prevent duped values in the tree. I have a beautiful proof for
this but alas it is too long to fit into the margin.

Also, as Adam mentions, anytime a document is altered it would trigger this cleanup code which
would fix the internal state of all docs affected by the duped revision bug. I'm also informed
that running a compaction will stem document revisions so that'd be a way to fix up an entire
db.

> Document returned by id, but cannot be found by rev
> ---------------------------------------------------
>
>                 Key: COUCHDB-1163
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1163
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Database Core
>    Affects Versions: 1.0.1, 1.0.2
>            Reporter: James Howe
>            Priority: Blocker
>             Fix For: 1.0.3, 1.1
>
>         Attachments: Couch logging for jira issue
>
>
> Somehow, our cluster has developed the following problem on a handful of documents. Will
post reproduction steps if we find them. All properties have been redacted. All the documents
this affects also have attachments, if that is significant. Once a document is in this situation,
it causes conflict detection, replication and include_docs to behave incorrectly or outright
fail.
> GET /database/4cdee83a118ea1cf3050b1d006144d46 returns
> {
>     "_id": "4cdee83a118ea1cf3050b1d006144d46",
>     "_rev": "10-df4bf65a6104ea240f100c30d3cb245d",
>     "foo": "bar"
> }
> GET /database/4cdee83a118ea1cf3050b1d006144d46?open_revs=all returns
> [
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "10-df4bf65a6104ea240f100c30d3cb245d",
>             "foo": "bar"
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "8-eea5e36daee12acd79a127abf36f7720",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "9-2cead1e4c813a4f0d10a9bc4aa28bfda",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "7-c3b44f004660caa496804409089b53d9",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "6-52e978041bb324d19e01a2ac5a243702",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "5-761bf28c6989f0fde41bdd5732c33159",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "4-abb005cf4b2d2dd12880a33af1e7066e",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "3-233e4624e620ec1c8b66f21a051832f8",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "10-55f0cdf9dd95ed230b733a2c826c842c",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "11-264c9d6c249ba2fc9b13df35cb447fd7",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "9-2cead1e4c813a4f0d10a9bc4aa28bfda",
>             _deleted: true
>         }
>     },
>     {
>         "ok": {
>             "_id": "4cdee83a118ea1cf3050b1d006144d46",
>             "_rev": "2-9f2df19059d9a460a12740a63a4d95e9",
>             _deleted: true
>         }
>     }
> ]
> GET /database/4cdee83a118ea1cf3050b1d006144d46?rev=10-df4bf65a6104ea240f100c30d3cb245d
returns
> {
>     "error": "not_found",
>     "reason": "missing"
> }

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