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From "Paul Joseph Davis (JIRA)" <>
Subject [jira] Updated: (COUCHDB-224) Improve B-Tree implementation
Date Sat, 09 Oct 2010 19:52:40 GMT


Paul Joseph Davis updated COUCHDB-224:

    Skill Level: Committers Level (Medium to Hard)

> Improve B-Tree implementation
> -----------------------------
>                 Key: COUCHDB-224
>                 URL:
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>    Affects Versions: 0.8
>            Reporter: Jan Lehnardt
>            Assignee: Damien Katz
>             Fix For: 1.0.2
>  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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