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https://issues.apache.org/jira/browse/CASSANDRA-3618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-3618.
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Resolution: Fixed
> OpenBitSet can allocate more bytes than it needs
> ------------------------------------------------
>
> Key: CASSANDRA-3618
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3618
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.1
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Fix For: 1.0.7
>
> Attachments: 0001-Fix-openBitSet.patch
>
>
> CASSANDRA-2466 changed OpenBitSet to break big long arrays into pages.
> However, it always allocate full pages, each page being of size 4096 * 8
> bytes. This means that we almost always allocate too much bytes, and for a
> row that has 1 column, the associated row bloom filter allocates 32760 more
> bytes than it should.
> This has a significant impact on performance. In a small test using the
> SSTableSimpleUnsortedWriter to generate rows with 1 column, 0.8 is about
> twice as fast as 1.0 because of that (the difference shrink when there is
> more columns obviously).
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