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Stu Hood updated CASSANDRA-1555: -------------------------------- Attachment: addendum-to-1555.txt Almost there... I'm attaching an addendum that I needed to get the long-running unit tests building. Once I got them running, they were reporting an exception: run `ant clean long-test` to reproduce. As is, this patch passes the row-level compatibility test on CASSANDRA-1822, so as soon as we figure out the false positive problem, I can give it a thumbs up. > 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 > Assignee: Ryan King > Fix For: 0.8 > > Attachments: addendum-to-1555.txt, cassandra-1555.tgz, > CASSANDRA-1555v2.patch, CASSANDRA-1555v3.patch.gz > > > 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.