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From "Sylvain Lebresne (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3929) Support row size limits
Date Fri, 17 Feb 2012 16:28:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210358#comment-13210358
] 

Sylvain Lebresne commented on CASSANDRA-3929:
---------------------------------------------

Agreed, it's hard to do efficiently. What is easy to do is to write a compaction strategy
(or have a strategy option) that only keeps the N first columns on each compaction. Of course,
that doesn't guarantee that you will only get the N most recent columns but in practice that
would fairly efficiently get rid of the excess data, which I believe is mostly what people
care about. Basically it would really just be "we'll discard everything we know is out of
the N first columns". I suspect that in practice that may be the good trade-off, but given
it's not perfect I've always though that it probably make more sense as an externally contributed
compaction strategy.
                
> Support row size limits
> -----------------------
>
>                 Key: CASSANDRA-3929
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3929
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Priority: Minor
>              Labels: ponies
>
> We currently support expiring columns by time-to-live; we've also had requests for keeping
the most recent N columns in a row.

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