[jira] [Resolved] (CASSANDRA-6935) Make clustering part of primary key a first order component in the storage engine

["Benedict (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-6935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedict resolved CASSANDRA-6935.
---------------------------------

    Resolution: Later

I think sylvain will be introducing some tickets that should encompass this change in the near future, so I'll close this in favour of those future discussions.

> Make clustering part of primary key a first order component in the storage engine
> ---------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6935
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6935
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: T Jake Luciani
>              Labels: performance
>             Fix For: 3.0
>
>
> It would be helpful for a number of upcoming improvements if the clustering part of the primary key were extracted from CellName, and if a ColumnFamily object could store multiple ClusteredRow (or similar) instances, within which each cell is keyed only by the column identifier.
> This would also, by itself, reduce on comparison costs and also permit memory savings in memtables, by sharing the clustering part of the primary key across all cells in the same row. It might also make it easier to move more data off-heap, by constructing an off-heap clustered row, but keeping the partition level object on-heap.



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