Question-36: Consider you have a setup of Cassandra cluster with the replication factor as 3 to prevent data loss. Which of the following statement is true when you delete a row/data?
- Consider you have a setup of Cassandra cluster with the replication factor as 3 to prevent data loss. Which of the following statement is true when you delete a row/data?
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Ans: A, D, E
Exp: As mentioned in the question we have multi node Cassandra cluster. Which can store replica of the same data across two or more nodes. If a node receives a delete for data it stores locally, the node marks the specified record for deletion and tries to pass the tombstone to other nodes containing replicas of that record. If one replica node is unresponsive at that time, it does not receive the tombstone immediately, so it still contains the pre-delete version of the record. If the tombstone has already been deleted from the rest of the cluster before that node recovers, the database treats the record on the recovered node as new data, and propagates it to the rest of the cluster. This kind of deleted but persisted records are called a zombie.
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