Detect and repair view indexes with duplicates in them
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Key: COUCHDB-999
URL: https://issues.apache.org/jira/browse/COUCHDB-999
Project: CouchDB
Issue Type: New Feature
Components: Database Core
Affects Versions: 1.0.1, 0.11.2
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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