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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-580) vector clock support
Date Wed, 25 Nov 2009 03:14:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782296#action_12782296
] 

Jonathan Ellis commented on CASSANDRA-580:
------------------------------------------

Yes, that's how you'd have to change it.  I'd rather not; it would get messy.

(If we do server-side resolution we could still conceivably support both "classic" columnfamilies
and vector clocked ones in the same Column and SuperColumn objects, just differing in their
clock/timestamp field.  But if we have to potentially store multiple versions of a column
in a single row for the vector clock version, then I think that is diverging too far and we'd
have to split the implementation.  Remember that a classic ColumnFamily object just has a
hash of its columns by name.)

> vector clock support
> --------------------
>
>                 Key: CASSANDRA-580
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-580
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>         Environment: N/A
>            Reporter: Kelvin Kakugawa
>            Assignee: Kelvin Kakugawa
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
> Allow a ColumnFamily to be versioned via vector clocks, instead of long timestamps. 
Purpose: enable incr/decr; flexible conflict resolution.

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