How does Apache Cassandra stores table data internally

From http://planetcassandra.org/making-the-change-from-thrift-to-cql/

Cassandra_Table_Storage_Internals

It is important to understand that the CQL data representation does not always match the underlying storage structure. This can be challenging for those accustomed to Thrift-based operations, as those were performed directly against the storage layer. But CQL introduces an abstraction on top of the storage rows, and only maps directly in the simplest of schemas.

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