How would you implement a key-value storage system if you were starting from scratch? The approach Basho settled on with Bitcask, their new backend for Riak, is an interesting combination of using RAM to store a hash map of file pointers to values and a log-structured file system for efficient writes. In this excellent Changelog interview, some folks from Basho describe Bitcask in more detail.
The essential Bitcask:
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