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https://issues.apache.org/jira/browse/CASSANDRA-1255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975673#action_12975673
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Stu Hood commented on CASSANDRA-1255:
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I looked into interning, but did not see any obvious performance improvement:
the branch is small and understandable though:
https://github.com/stuhood/cassandra-old/commits/1255 , if somebody wants to
run with it.
> Explore interning keys and column names
> ---------------------------------------
>
> Key: CASSANDRA-1255
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1255
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Stu Hood
> Assignee: Stu Hood
>
> With multiple Memtables, key caches and row caches holding DecoratedKey
> references, it could potentially be a huge memory savings (and relief to GC)
> to intern DecoratedKeys. Taking the idea farther, for the skinny row pattern,
> and for certain types of wide row patterns, interning of column names could
> be very beneficial as well (although we would need to wrap the byte[]s in
> something for hashCode/equals).
> This ticket should explore the benefits and overhead of interning.
> Google collections/guava MapMaker is a very convenient way to create this
> type of cache: example call:
> http://stackoverflow.com/questions/2865026/use-permgen-space-or-roll-my-own-intern-method/2865083#2865083
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