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Date: Fri, 12 Apr 2013 13:40:16 +0000 (UTC)
From: "T Jake Luciani (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12637544.1363617645910.156824.1365774016446@arcas>
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Subject: [jira] [Commented] (CASSANDRA-5357) Query cache
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    [ https://issues.apache.org/jira/browse/CASSANDRA-5357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630062#comment-13630062 ] 

T Jake Luciani commented on CASSANDRA-5357:
-------------------------------------------

One idea we have been playing with is to create a row cache that writes to SSD.  This is similar to how https://github.com/facebook/flashcache/ works.

The idea being you put you cold rows are on spinning disk and your hot rows are cached on SSD (uncompressed).  

I think this would work really well and would be a good use for keeping the old row cache around.  
                
> Query cache
> -----------
>
>                 Key: CASSANDRA-5357
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5357
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>            Assignee: Vijay
>
> 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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