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SSTable
Let's learn how Tablets are stored in SSTables.
How are Tablets stored in GFS?
BigTable uses Google File System (GFS), a persistent distributed file storage system to store data as files. The file format used by BigTable to store its files is called SSTable:
- SSTables are persisted, ordered maps of keys to values, where both keys and values are arbitrary byte strings.
- Each Tablet is stored in GFS as a sequence of files called SSTables.
- An SSTable consists of a sequence of data blocks (typically 64KB in size).
- A block index is used to locate blocks; the index is loaded into memory
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