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https://issues.apache.org/jira/browse/CASSANDRA-225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12719377#action_12719377
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Jonathan Ellis commented on CASSANDRA-225:
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sorry, should s/atomic/strongly consistent/ above. Neither block_for=N nor
"mastered writes" give you atomicity. (Consider the x+=1 case Sandeep
mentions.)
> Support mastered writes
> -----------------------
>
> Key: CASSANDRA-225
> URL: https://issues.apache.org/jira/browse/CASSANDRA-225
> Project: Cassandra
> Issue Type: New Feature
> Affects Versions: 0.4
> Environment: all
> Reporter: Sandeep Tata
> Assignee: Sandeep Tata
> Fix For: 0.4
>
> Attachments: 225.patch
>
>
> Writes to a row today can be run on any of the replicas that own the row. An
> additional set of APIs to perform "mastered" writes that funnel through a
> primary is important if applications have some operations that require higher
> consistency. Test-and-set is an example of one such operation that requires a
> higher consistency guarantee.
> To stay true to Cassandra's performance goals, this should be done in a way
> that does not compromise performance for apps that can deal with lower
> consistency and never use these APIs. That said, an app that mixes higher
> consistency calls with lower consistency calls should be careful that they
> don't operate on the same data.
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