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https://issues.apache.org/jira/browse/CASSANDRA-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926406#action_12926406
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Gary Dusbabek commented on CASSANDRA-1684:
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Would they be static like App Engine, or would we permit dynamically
adding/subtracting existing rows to an entity group, in effect, moving them?
the G-Store paper explains one approach to this:
www.cs.ucsb.edu/~sudipto/papers/socc10-das.pdf
> 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
> Fix For: 0.8
>
>
> 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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