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https://issues.apache.org/jira/browse/CASSANDRA-4865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486977#comment-13486977
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Jonathan Ellis commented on CASSANDRA-4865:
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Would prefer to not need to rewrite existing sstables to get off-heap BF --
seems to me we can make the off heap de/serialize code compatible with the
original OpenBitSet code. Slightly ugly to have the unnecessary pageCount/Size
business but worth it to get instant off-heap BF on upgrade.
> Off-heap bloom filters
> ----------------------
>
> Key: CASSANDRA-4865
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4865
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Vijay
> Fix For: 1.2.1
>
> Attachments: 0001-CASSANDRA-4865.patch, 0001-CASSANDRA-4865-v2.patch
>
>
> Bloom filters are the major user of heap as dataset grows. It's probably
> worth it to move these off heap. No extra refcounting needs to be done since
> we already refcount SSTableReader.
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