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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1684) Entity groups
Date Wed, 23 Nov 2011 16:25:40 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155949#comment-13155949
] 

Jonathan Ellis commented on CASSANDRA-1684:
-------------------------------------------

Do we really need row groups now that we can have arbitrary nesting within a row via composite
columns?  Looked at that way the row key itself becomes the "entity group id."
                
> 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: 1.1
>
>   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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