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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3362) allow sub-row repair
Date Wed, 16 Nov 2011 16:51:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151320#comment-13151320
] 

Jonathan Ellis commented on CASSANDRA-3362:
-------------------------------------------

That's a pretty big ouch for wide-row data models.  If you're doing tens of appends per second
to one of those, the odds are pretty good that your merkle trees will be out of sync at any
given instant, and you end up streaming the entire row.
                
> allow sub-row repair
> --------------------
>
>                 Key: CASSANDRA-3362
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3362
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>              Labels: repair
>
> With large rows, it would be nice to not have to send an entire row if a small part is
out of sync.  Could we use the row index blocks as repair atoms instead of the full row?

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