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From "Kelvin Kakugawa (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1072) Increment counters
Date Wed, 15 Dec 2010 17:24:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971745#action_12971745
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Kelvin Kakugawa commented on CASSANDRA-1072:
--------------------------------------------

Yes, I agree that modifying the value / partitioned counter implementation is interesting.
 I thought about it and my original rationale isn't as strong--optimizing for reads.  We could
do a lazy optimization that keeps the calculated total, in memory, after it's been read the
first time (invalidating, after an update).

I think the rest of the comments are reasonable, as well.  Although, I've fixed 1830 in this
patch months ago.  (I should have broken it out into a separate patch.)  And, I'd prefer replicate_on_write,
because it *may* be more general.  Although, like you, I don't see a use for it beyond counters,
atm.

I'd be happy to fix the above after commit, though.  As long as we modify the value / partitioned
counter implementation before 0.7.0 is final.

> Increment counters
> ------------------
>
>                 Key: CASSANDRA-1072
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1072
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Johan Oskarsson
>            Assignee: Kelvin Kakugawa
>         Attachments: CASSANDRA-1072.121310.patch, CASSANDRA-1072.patch, increment_test.py,
Partitionedcountersdesigndoc.pdf
>
>
> Break out the increment counters out of CASSANDRA-580. Classes are shared between the
two features but without the plain version vector code the changeset becomes smaller and more
manageable.

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