References - https://wiki.apache.org/cassandra/AntiEntropy - http://stackoverflow.com/questions/13222713/why-is-the-word-entropy-present-in-anti-entropy-protocols - http://distributeddatastore.blogspot.in/2013/07/cassandra-using-merkle-trees-to-detect.html - https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/utils/MerkleTree.java