[ 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.