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https://issues.apache.org/jira/browse/CASSANDRA-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13005650#comment-13005650
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Jonathan Ellis commented on CASSANDRA-1684:
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By "like App Engine [megastore]" we only mean "atomic within a group" not
"consistent and isolated within a group." the former is useful even without
the latter.
> Entity groups
> -------------
>
> Key: CASSANDRA-1684
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1684
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Sylvain Lebresne
> Fix For: 0.8
>
> Original Estimate: 80h
> Remaining Estimate: 80h
>
> Supporting entity groups similar to App Engine's (that is, allow rows to be
> part of a parent "entity group," whose key is used for routing instead of the
> row itself) allows several improvements:
> - batches within an EG can be atomic across multiple rows
> - order-by-value queries within an EG only have to touch a single replica
> even with RandomPartitioner
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