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From "Kelvin Kakugawa (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-580) vector clock support
Date Mon, 04 Jan 2010 22:40:54 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796405#action_12796405
] 

Kelvin Kakugawa commented on CASSANDRA-580:
-------------------------------------------

Thanks for your comments.

(1) I thought about putting the utility methods in FBUtilities.  However, I left them in VVC
for this pass.  I can move them over.

(2) You're right about cBSA.  I didn't implement the cases that were already handled by VVC.
 However, if I move it to FBUtilities, I'll look for all the missing cases.

(3) Thanks for the heads up.  I'll look into replacing those loops w/ arraycopy.

(4) My goal is to keep the context an opaque array, because I want to be support other version
implementations.  i.e. interval tree clocks, which have a different format.  So, if I wanted
to use an object representation, VVC would have to internally inflate the opaque context.
 However, the manual byte manipulation isn't as easy to read as an object-based implementation
and this was a concern of mine.

Right now, for the reconcile() method, I'm probably going to modify its interface.  Instead
of using a List of Pair objects, I have a new IColumn impl, VectorColumn, that would probably
be more appropriate than Pair.

> 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
>         Attachments: 580-context-v1.patch, 580-context-v2.patch, 580-context-v3.patch,
580-interface-1-add-vector-clock.diff, 580-interface-2-add-vector-clock.diff, 580-thrift-v3.patch,
580-thrift-v4.patch, 580-thrift-v5.patch, 580-thrift-v6.patch
>
>   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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