What is an SSTable?

Question

In BigTable/GFS and Cassandra terminology, what is the definition of a SSTable?

Answer 1

A tablet is stored in the form of SSTables.

SSTable (directly mapped to GFS) is key-value based immutable storage. It stores chunks of data, each is of 64KB.

Definitions:

• Index of the keys: key and starting location
• Chunk is a storage unit in GFS, replica management are by chunk