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From "Jocelyn Racoillet (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-998) Replace SuperColumn and ColumnFamily structures
Date Mon, 25 Apr 2011 12:15:06 GMT


Jocelyn Racoillet commented on CASSANDRA-998:

Note to people looking for an alternative to SuperColumns, this looks promising: composite
columns and CompositeType comparer (CASSANDRA-2231).

> Replace SuperColumn and ColumnFamily structures
> -----------------------------------------------
>                 Key: CASSANDRA-998
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Stu Hood
>            Assignee: Stu Hood
>             Fix For: 0.8 beta 1
> The most important concepts to come out of CASSANDRA-674 were the Slice, Metadata and
ColumnKey structures.
> As a replacement for SuperColumns and ColumnFamilies in the current codebase, Slices
can addtionally:
> * Represent arbitrarily nested columns
> * Allow for eventually consistent range deletes (equivalent to a CF containing multiple
'markedForDelete' values)
> * Be used for memory efficient compactions, since they encapsulate nesting and can be
> * Eliminate code duplication for SuperColumn handling
> This is an umbrella ticket for the task of replacing the SuperColumn and ColumnFamily
datastructures in the codebase, preferably with something like Slice.

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