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Posted to commits@cassandra.apache.org by "Brandon Williams (JIRA)" <ji...@apache.org> on 2011/02/17 21:03:26 UTC

[jira] Commented: (CASSANDRA-2175) make key cache preheating use less memory

    [ https://issues.apache.org/jira/browse/CASSANDRA-2175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12996020#comment-12996020 ] 

Brandon Williams commented on CASSANDRA-2175:
---------------------------------------------

+1

> make key cache preheating use less memory
> -----------------------------------------
>
>                 Key: CASSANDRA-2175
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2175
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 0.6.9, 0.7.0 rc 3
>            Reporter: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.6.12, 0.7.3
>
>         Attachments: 2175-0.6.txt
>
>
> CASSANDRA-1878 pre-heats the key cache post-compaction so latency doesn't suffer while warming the cache back up.  This can double the memory used temporarily; for a large key cache, this can have a substantial impact.
> For now a boolean on/off is probably the best we can do.  With http://code.google.com/p/concurrentlinkedhashmap/issues/detail?id=21 though, we could say "preheat the hottest X keys."

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