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https://issues.apache.org/jira/browse/CASSANDRA-9638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-9638:
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Component/s: Distributed Metadata
> Mirrored distribution tables with same PK
> -----------------------------------------
>
> Key: CASSANDRA-9638
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9638
> Project: Cassandra
> Issue Type: New Feature
> Components: Distributed Metadata
> Reporter: Constance Eustace
> Priority: Major
>
> CASSANDRA-9231 covers probably most of this...
> Many of the problems with CAP and cross-partition data seems to deal with the
> data not being local across partitions.
> Shouldn't it be possible to provide a mechanism where associated or "child"
> data gets mapped in the same data distribution pattern as the parent
> key/table, even in Vnodes?
> Certainly if the PK is exactly the same (extension tables or the like). And
> while schema could technically be centralized in the same rowkey, in reality
> the "sweet spot" of columns / partition key gets in the way of this.
> It would be super tough mathematically to do the same distribution for PKs
> that are something like PK: {parentkey, extensionkey) and get that to
> hash/distribute the same, but that would be nice, but perhaps an expansion of
> key lookup to calculate "distribution/vnode key that maps to the distribution
> range, and then an actual lookup key in the node for the actual partition row.
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