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Date: Thu, 10 Feb 2011 22:11:58 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
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Subject: [jira] Commented: (CASSANDRA-2102) saved row cache doesn't save the
 cache
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    [ https://issues.apache.org/jira/browse/CASSANDRA-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993238#comment-12993238 ] 

Hudson commented on CASSANDRA-2102:
-----------------------------------

Integrated in Cassandra-0.7 #276 (See [https://hudson.apache.org/hudson/job/Cassandra-0.7/276/])
    

> saved row cache doesn't save the cache
> --------------------------------------
>
>                 Key: CASSANDRA-2102
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2102
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.7.0
>            Reporter: Matthew F. Dennis
>            Assignee: Matthew F. Dennis
>             Fix For: 0.7.1
>
>         Attachments: 2102-cassandra-0.7-v2.txt, 2102-cassandra-0.7.txt
>
>
> saving row caches works by periodically iterating of the keySet() on the caches and writing the keys for the cached contents to disk.  The cache keys are DecoratedKeys.  DecoratedKeys contain a Token token and a ByteBuffer key.  The underlying buffer on the key gets reused so the contents change.  This means that all the cache entries have distinct tokens but only a handful of distinct key values.  This means that when the cache is loaded you only end up loading a handful of keys instead of the ones actually in your cache.

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