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From "Yuki Morishita (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-4197) Index caching
Date Fri, 04 May 2012 21:37:47 GMT


Yuki Morishita updated CASSANDRA-4197:

    Attachment: 4197-1.1.txt

Patch to set index CF's cache based on parent CF's setting and indexed column's cardinality.

Here I set the bar to determine "high" cardinality on rows/cols ratio in index CF. Number
of rows in index CF is equal to cardinality, and if the ratio is greater than 1, then one
can determine if indexed column has high cardinality.
> Index caching
> -------------
>                 Key: CASSANDRA-4197
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Yuki Morishita
>            Priority: Minor
>             Fix For: 1.1.1
>         Attachments: 4197-1.1.txt
> Currently, the "hidden" CFs backing secondary indexes are created with Caching.NONE,
which can result in slower-than-expected index queries.

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