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Posted to notifications@couchdb.apache.org by "Paul Joseph Davis (JIRA)" <ji...@apache.org> on 2017/02/11 21:23:41 UTC

[jira] [Created] (COUCHDB-3298) Improve couch_btree:chunkify logic

Paul Joseph Davis created COUCHDB-3298:
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             Summary: Improve couch_btree:chunkify logic
                 Key: COUCHDB-3298
                 URL: https://issues.apache.org/jira/browse/COUCHDB-3298
             Project: CouchDB
          Issue Type: Improvement
          Components: Database Core
            Reporter: Paul Joseph Davis


The current chunkify has problems when reduce functions create large values in that it will produce chunks (ie, kp nodes) that contain a single key. In some pathological cases this can create long chains of nodes that never branch.

The old chunkify would also try and create nodes with an even number of bytes in each chunk. Given that we don't re-use chunks it makes more sense to try and pack our chunks as close to the threshold as possible so that we're creating fewer branches in our tree.



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