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From "Chris Anderson (JIRA)" <>
Subject [jira] Commented: (COUCHDB-92) Have compaction work on view indexes
Date Sat, 04 Apr 2009 23:07:13 GMT


Chris Anderson commented on COUCHDB-92:

I think it should go into trunk, for sure.

> Have compaction work on view indexes
> ------------------------------------
>                 Key: COUCHDB-92
>                 URL:
>             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
> 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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