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From "Matthew F. Dennis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-2102) saved row cache doesn't save the cache
Date Wed, 02 Feb 2011 22:51:29 GMT


Matthew F. Dennis updated CASSANDRA-2102:

    Affects Version/s: 0.7.0
        Fix Version/s: 0.7.2

> saved row cache doesn't save the cache
> --------------------------------------
>                 Key: CASSANDRA-2102
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.7.0
>            Reporter: Matthew F. Dennis
>            Assignee: Matthew F. Dennis
>             Fix For: 0.7.2
> 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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