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https://issues.apache.org/jira/browse/CASSANDRA-2521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050773#comment-13050773
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Terje Marthinussen commented on CASSANDRA-2521:
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We stopped using mmap a while back. Benchmarks was highly inconclusive about
any performance benefits and the operational benefits of seeing how much memory
the darned thing actually uses and general improved stabilty has so far easily
outweighed any teorethical lower singel digit performance benefit we could find
in static benchmarks and on more realistic use we so far don't really see any
performance issues.
Personally I have no problems with a patch with that limitation.
> Move away from Phantom References for Compaction/Memtable
> ---------------------------------------------------------
>
> Key: CASSANDRA-2521
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2521
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Chris Goffinet
> Assignee: Sylvain Lebresne
> Fix For: 1.0
>
> Attachments:
> 0001-Use-reference-counting-to-decide-when-a-sstable-can-.patch
>
>
> http://wiki.apache.org/cassandra/MemtableSSTable
> Let's move to using reference counting instead of relying on GC to be called
> in StorageService.
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