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https://issues.apache.org/jira/browse/COUCHDB-92?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695798#action_12695798
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Chris Anderson commented on COUCHDB-92:
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I think it should go into trunk, for sure.
> Have compaction work on view indexes
> ------------------------------------
>
> Key: COUCHDB-92
> URL: https://issues.apache.org/jira/browse/COUCHDB-92
> Project: CouchDB
> Issue Type: Improvement
> Components: JavaScript View Server
> Affects Versions: 0.8
> Reporter: Jan Lehnardt
> Fix For: 0.10
>
>
> Right now, view indexes just grow and grow with each new index update. Since
> they are just indexes, and not the data itself, compaction is simply a matter
> of deleting the index files.
> Also, the current Btree implementation isn't completely self balanacing. It
> misses a balancing condition, partially for efficiency (it's an expensive
> balancing operation), and for expediency. It was easier to not implement it
> and gets the general case perormance boost.
> The thing about this is, the btree code can remain as is if the indexing
> compaction just recopies the map values (and back indexes) and recomputes the
> reduction values. That's a very simple design, however, if the btree is
> completely self balancing, then the btree can be copied on a node by node
> basis, instead of a value by value basis, and the reduction values need not
> be recomputed all. This will make the compaction significantly faster overall.
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