Acunu - Cassandra optimized (SSDs, new data structure)
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For some workloads, they achieve 2 orders of magnitude better latency results relative to a vanilla Cassandra distribution. This is achieved through a combination of SSDs and a new data structure (Stratified B-tree).
Acunu White paper. http://bit.ly/jQc423
Short Blog entries on Cassandra performance
http://bit.ly/mUqWLO Cassandra under heavy write load, Part 1
http://bit.ly/mMT0Ts Cassandra under heavy write load, Part 2
Remembering B-trees http://bit.ly/lH8fwh
http://bit.ly/lryYbf Copy-on-Write B-tree beaten by Stratified B-tree
http://bit.ly/iJg01H A summary of the above paper
http://bit.ly/jV5j1x More on why Fractal-tree DBs scale better on SSDs. Cache oblivious Fractal Trees
http://slidesha.re/jIRkYj More on streaming data structures : doubling array, fractional cascading, and stratified doubling arrays explained (presentation) <— V. Good
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