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https://issues.apache.org/jira/browse/CASSANDRA-3929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487467#comment-13487467
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Jonathan Ellis commented on CASSANDRA-3929:
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Good idea putting the code in the index Builder!
It looks though that build() is only used when we can fit the row in memory,
otherwise LazilyCompactedRow calls {{add}} directly (also called by {{build}}).
So I think you're going to need to move the retained row count into the
Builder instance to maintain state across invocations.
> Support row size limits
> -----------------------
>
> Key: CASSANDRA-3929
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3929
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Affects Versions: 1.2.1
> Reporter: Jonathan Ellis
> Assignee: Dave Brosius
> Priority: Minor
> Labels: ponies
> Fix For: 1.2.1
>
> Attachments: 3929_b.txt, 3929_c.txt, 3929.txt
>
>
> 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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