Cassandra
Cassandra was developed by Facebook for their Inbox searching feature. It was released open source when Facebook turned it over to Apache in 2008. Cassandra is a key/value store that runs on a flexible cluster of nodes and is also a wide column store, like HBase discussed later in the “Wide Column Store” section. Nodes may be added and removed from the cluster. Data is replicated across multiple nodes of the cluster. There is no central node, access to data exists from any node; if the node receiving the request does not house the specific data requested, it still services the request by retrieving and sending the data. The main goal of Cassandra is fast retrieval of data with fault tolerance being handled through replication across ...
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