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I cant find it in cassandra.yaml, maybe nodetool can get me the configured replication factor of my cluster?
What is the default value of the replication factor?
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The Replication Factor (RF) is equivalent to the number of nodes where data (rows and partitions) are replicated. Data is replicated to multiple (RF=N) nodes. An RF of one means there is only one copy of a row in a cluster, and there is no way to recover the data if the node is compromised or goes down.
Can I change the replication factor (a a keyspace) on a live cluster? Yes, but it will require running a full repair (or cleanup) to change the replica count of existing data: Alter <alter-keyspace-statement> the replication factor for desired keyspace (using cqlsh for instance).
Replication Factor: It is basically the number of times Hadoop framework replicate each and every Data Block. Block is replicated to provide Fault Tolerance. The default replication factor is 3 which can be configured as per the requirement; it can be changed to 2 (less than 3) or can be increased (more than 3.).
In a Cassandra cluster, a keyspace is an outermost object that determines how data replicates on nodes. Keyspaces consist of core objects called column families (which are like tables in RDBMS), rows indexed by keys, data types, data center awareness, replication factor, and keyspace strategy.
A cluster doesn't have a replication factor, however your keyspaces does.
If you want to look at the replication factor of a given keyspace, simply execute SELECT * FROM system_schema.keyspaces; and it will print all replication information you need.
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