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https://issues.apache.org/jira/browse/CASSANDRA-2521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061761#comment-13061761
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Jeff Kesselman commented on CASSANDRA-2521:
-------------------------------------------

Just a note: while relying on phantom references or finalizer for your cleanup 
is incorrect, it is reasonable to use them to do a verification that your 
cleanup has occurred on those objects that do get collected.  This is with the 
caveat however that PhantomReferences always add something to your gc costs so 
you might want to make it switchable.

> 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, 
> 0001-Use-reference-counting-to-decide-when-a-sstable-can-v2.patch, 
> 0002-Force-unmapping-files-before-deletion-v2.patch, 2521-v3.txt, 2521-v4.txt
>
>
> 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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