Write path
The picture below explains what happens after a written request is directed to a specific node. Please note the proposed designs for write/read paths are primarily based on the architecture of Cassandra.
The write request is persisted on a commit log file.
Data is saved in the memory cache.
When the memory cache is full or reaches a predefined threshold, data is flushed to SSTable on disk. Note: A sorted-string table (SSTable) is a sorted list of <key, value> pairs. For readers interested in learning more about SStable, refer to the reference material
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