Configuring the replication factor
This content applies only to On-premises and Client-managed cloud environments
Ensure reliability and fault tolerance by controlling how many data replicas you want to store across a Cassandra cluster.
The replication factor is the total number of replicas for a keyspace across a Cassandra cluster. A replication factor of 3 means that there are three copies of each row, where each copy is on a different node and is equally important.
By setting a high replication factor, you ensure a higher likelihood that the data on the node exists on another node, in case of a failure. The disadvantage of a high replication factor is that write operations take longer.
- To change the default replication factor, open the
prconfig.xmlfile and modify the dnode/default_keyspaces property.The default setting for all keyspaces is 3:data=3,vbd=3,states=3,aggregation=3,adm=3,adm_commitlog=3
- Impact of failing nodes on system stability
Learn how the number of functional nodes and the current replication factor affect system stability when some of the Cassandra nodes are down.
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