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From "Paul Joseph Davis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-999) Detect and repair view indexes with duplicates in them
Date Wed, 29 Dec 2010 14:47:48 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975789#action_12975789
] 

Paul Joseph Davis commented on COUCHDB-999:
-------------------------------------------

My preference would be for a view compactor that detects and reports the error without attempting
to repair the index in place as that's the least amount of code.

> Detect and repair view indexes with duplicates in them
> ------------------------------------------------------
>
>                 Key: COUCHDB-999
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-999
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Database Core
>    Affects Versions: 0.11.2, 1.0.1
>            Reporter: Adam Kocoloski
>
> In COUCHDB-968 we discovered and fixed a bug that could introduce duplicate documents
in a database.  Under certain circumstances these duplicate documents would introduce duplicate
entries in view indexes.
> We can detect duplicates in the view group by looking for duplicate entries in the docid
=> view key btree.  We can try to repair the view indexes by removing the extra keys from
the views, or we can just report that duplicates exist in the view group and direct the user
to rebuild that group.  We might incorporate this code into the view compactor, or we might
release it as a separate standalone tool.
> I think my personal preference is to include any repair functionality in the view compactor.
 A separate standalone tool that simply reports the presence of duplicates would also be a
nice thing to have.

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