In Cassandra, the ___________ determines how many copies of the data will be maintained across multiple nodes.
1) Replication Factor 2)None of the above 3)Read Consistency 4)Write Consistency
Answers
The answer is option 1) Replication Factor.
Cassandra stores replicas on multiple nodes to ensure authenticity and fault tolerance. A replication policy defines the nodes where replicas are stored. The total number of replicas across the batch is referred to as the replication factor.
A replication factor of 1 means that there is only one copy of each row in the cluster. If the node containing the row goes down, the row cannot be retrieved. A replication factor of 2 means two copies of each row, where each copy is on a different node. All replicas are equally important, and there is no primary or master replica.
The correct answer is (1)-Replication.
A replication factor- 1 means that only 1 copy of each row in the Cassandra cluster is present.
A replication factor- 2 means that there are 2 copies of each row is present and where each copy is on a different node.
If a user wants to view the Cassandra schema, and if he wants to know the replication factor for each keyspace, then he/she has to run the followling code:
Firstly,log in to a Cassandra node.
After that, run the following command:
$/opt/apigee/apigee-cassandra/bin/cassandra-cli -h $(hostname -i) <<< "show schema;"