[jira] Commented: (CASSANDRA-792) Configurable 'merge factor' for Column Families

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833649#action_12833649 ] 

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: https://issues.apache.org/jira/browse/CASSANDRA-792
>             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, 0004-Configurable-MergeFactor.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': http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc/core/index.html

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