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Space efficient Bloom filter index, 2x performance gain

To quote Wikipedia: A Bloom filter is a space-efficient probabilistic data structure that is used to test whether an element is a member of a set. This is often used by systems in order to avoid accessing slow media, like a disk. Take HBase or Cassandra for instance: Instead of reading their data files in […]

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Oracle Coherence and MapReduce

I spend a lot of my time working with Oracle Coherence. If you’ve never heard of Coherence it can briefly be described as a¬†linearly scalable in-memory HashMap. By linearly scalable I mean a distributed HashMap, where each cluster member is responsible for storing a portion of the complete map. As everything is in-memory you maintain […]