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From "Jack Krupansky (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-6477) Materialized Views (was: Global Indexes)
Date Tue, 12 May 2015 20:58:05 GMT


Jack Krupansky commented on CASSANDRA-6477:

Back to the original description, will the revised MV purpose address the high cardinality
issue? That may depend on what guidance the spec offers for how data modelers should set up
the primary key columns in terms of partition (or routing!) columns vs. clustering columns.

Is the basic concept that although the selected rows might be scattered across multiple nodes
in the base table, the goal is that they would cluster together on a single node for the MV
table based on careful specification of partition key columns in the MV?

> Materialized Views (was: Global Indexes)
> ----------------------------------------
>                 Key: CASSANDRA-6477
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Carl Yeksigian
>              Labels: cql
>             Fix For: 3.x
> Local indexes are suitable for low-cardinality data, where spreading the index across
the cluster is a Good Thing.  However, for high-cardinality data, local indexes require querying
most nodes in the cluster even if only a handful of rows is returned.

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