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qb4j (pronounced 'cube for j') is the first open source multi-dimensional logging framework for Java coupled with an OLAP analytical platform. qb4j doesn't create log files. It creates log cubes (or cube logs).
HydraCube is a highly scalable multi dimensional aggregation (OLAP) engine which supports MDX queries for data retrieval. It is a parallel software and can be run on network of wrokstations or multi processor shared memory systems.