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From "Ed Anuff (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1684) Entity groups
Date Thu, 24 Feb 2011 07:45:38 GMT


Ed Anuff commented on CASSANDRA-1684:

This is something I've been thinking about while consolidating the number of column families
within an application so that I ended up with row keys that were constructed from concatenating
an entity id with various other strings (eg. 9081bd70-3fe4-11e0-9207-0800200c9a66:something
).  Is it feasible to have a partitioner that hashed on just the first x bytes in a key? 
Do tokens have to be one-to-one unique with keys, or could you have multiple keys share the
same token? (apparently that's currently possible, although an extreme edge case, with the

> Entity groups
> -------------
>                 Key: CASSANDRA-1684
>                 URL:
>             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
>  - 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

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