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Posted to commits@cassandra.apache.org by "Ryan King (JIRA)" <ji...@apache.org> on 2010/11/17 20:56:14 UTC
[jira] Updated: (CASSANDRA-1555) Considerations for larger bloom
filters
[ https://issues.apache.org/jira/browse/CASSANDRA-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ryan King updated CASSANDRA-1555:
---------------------------------
Attachment: cassandra-1555.tgz
0001-openbitset.patch
Port of Lucene's OpenBitSet (taken from patch on CASSANDRA-1472)
0002-switch-bf-to-obs.patch
Switch to use OBS in the BF. It should still be able to read BitSets from disk, but that needs more testing.
> Considerations for larger bloom filters
> ---------------------------------------
>
> Key: CASSANDRA-1555
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1555
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Stu Hood
> Fix For: 0.8
>
> Attachments: cassandra-1555.tgz
>
>
> To (optimally) support SSTables larger than 143 million keys, we need to support bloom filters larger than 2^31 bits, which java.util.BitSet can't handle directly.
> A few options:
> * Switch to a BitSet class which supports 2^31 * 64 bits (Lucene's OpenBitSet)
> * Partition the java.util.BitSet behind our current BloomFilter
> ** Straightforward bit partitioning: bit N is in bitset N // 2^31
> ** Separate equally sized complete bloom filters for member ranges, which can be used independently or OR'd together under memory pressure.
> All of these options require new approaches to serialization.
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