Cassandra Interview Questions and Answers
Ques 11. How does Cassandra handle write operations?
Cassandra uses a write-ahead log (WAL) and a memtable for write operations. Data is first written to the commit log for durability and then stored in the memtable, which is periodically flushed to an SSTable on disk.
Ques 12. Explain the concept of eventual consistency in Cassandra.
Eventual consistency in Cassandra means that, given enough time and in the absence of further updates, all replicas of a piece of data will converge to the same value. It allows for high availability and partition tolerance but may result in temporarily inconsistent data.
Ques 13. What is a secondary index in Cassandra?
A secondary index in Cassandra allows querying on columns other than the primary key. However, the use of secondary indexes should be carefully considered due to potential performance implications.
Ques 14. How does Cassandra ensure fault tolerance?
Cassandra achieves fault tolerance through data replication. Each piece of data is replicated across multiple nodes in the cluster, ensuring that if a node fails, the data is still available on other nodes.
Ques 15. Explain the role of the Gossip Protocol in Cassandra.
The Gossip Protocol is used by nodes in a Cassandra cluster to communicate with each other and share information about the state of the cluster. It helps in maintaining a decentralized and dynamic view of the cluster.
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