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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5357) Query cache / partition head cache
Date Mon, 13 Jan 2014 16:32:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13869667#comment-13869667
] 

Jonathan Ellis commented on CASSANDRA-5357:
-------------------------------------------

If you have a single row per partition, how much of the table you cache is purely a function
of cache size.

> Query cache / partition head cache
> ----------------------------------
>
>                 Key: CASSANDRA-5357
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5357
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jonathan Ellis
>            Assignee: Marcus Eriksson
>             Fix For: 2.1
>
>         Attachments: 0001-Cache-a-configurable-amount-of-columns-v2.patch, 0001-Cache-a-configurable-amount-of-columns.patch
>
>
> I think that most people expect the row cache to act like a query cache, because that's
a reasonable model.  Caching the entire partition is, in retrospect, not really reasonable,
so it's not surprising that it catches people off guard, especially given the confusion we've
inflicted on ourselves as to what a "row" constitutes.
> I propose replacing it with a true query cache.



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