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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-792) Configurable 'merge factor' for Column Families
Date Mon, 15 Feb 2010 00:07:27 GMT


Jonathan Ellis commented on CASSANDRA-792:

Can you elaborate as to what problem you are trying to solve here?  Your link goes to lucene
general index.  And even if it did not pointing to a cool feature in some other system doesn't
immediately make clear why we should try to imitate it.

> Configurable 'merge factor' for Column Families
> -----------------------------------------------
>                 Key: CASSANDRA-792
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Stu Hood
>             Fix For: 0.6
>         Attachments: 0001-Use-logarithmic-bucket-sizes-and-always-compact-the-.patch,
0002-Cap-memory-usage-for-all-SSTables-being-compacted.patch, 0003-Hardcoded-per-cf-merge-factor.patch,
> Apache Lucene flushes and merges 'segments' in a manner that is quite similar to the
treatment of Cassandra's sstables.
> One interesting and powerful tunable that Lucene provides is 'mergeFactor':

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