Grokking the System Design Interview, Volume II
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Replication

Let's look at how Cassandra replicates data across nodes, and how it keeps working when nodes fail.

Each node in Cassandra serves as a replica for a different range of data. Cassandra stores multiple copies of data and spreads them across several replicas. So if one node goes down, another replica can still answer queries for that range. This replication process depends on two factors.

  • Replication factor
  • Replication strategy

Replication factor

The replication factor is the number of nodes that receive a copy of the same data

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A

Amey Naik

· 5 years ago

"Each keyspace in Cassandra can have a different replication factor."

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A

Amey Naik

· 5 years ago

" The replica sent to Server 4 will have a hint in its metadata that suggests which node was the intended recipient of the replica (in this case, Server 1)"

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