CODEWITHSUNDEEP
cassandracqlcassandra-3.0
Hossein
Hossein

Reputation: 1292

Creating Cassandra sub-clusters

I need to create K overlapping Cassandra clusters on N machines (K>>N). Each cluster can have between 1 to N nodes. I know that one way of doing so is to create a separate process (or docker container) for each cluster a node is a member of.

My question however is that can I change Cassandra to allow the creation of sub-clusters? meaning that there would be only 1 Cassandra instance running on each node, but I would be able to take control of data replication and data placement so that within a sub-cluster for example, I would be able to do a Quorum write for example.

Upvotes: 0

Views: 47

Answers (1)

Alex Ott
Alex Ott

Reputation: 87119

No, it's not possible to define the sub-cluster as you describe - there is always a single Cassandra cluster per process.

But Cassandra has a notion of the Datacenter that defines where machine resides, and the keyspace that defines how the data is replicated between datacenters and nodes. And consistency level, like, QUORUM depends on the keyspace configuration.

In your case I would think in that direction - define datacenters, create necessary keyspaces, and setup correct replication factors for that keyspaces.

Upvotes: 1

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