Cassandra Questions et reponses d'entretien
Question 21. How does Cassandra handle data distribution across nodes?
Cassandra uses a consistent hashing algorithm to distribute data across nodes in the cluster. This ensures a uniform distribution of data and facilitates efficient data retrieval.
Question 22. Explain the concept of a quorum in Cassandra.
A quorum in Cassandra is a majority of replicas that must respond for a read or write operation to be considered successful. The quorum level is configurable and is used to ensure consistency in distributed systems.
Question 23. What are the different compaction strategies in Cassandra?
Cassandra supports several compaction strategies, including SizeTieredCompactionStrategy, LeveledCompactionStrategy, and TimeWindowCompactionStrategy. Each strategy has its own advantages and is suited for specific use cases.
Question 24. Explain the concept of tombstones in Cassandra.
Tombstones in Cassandra are markers used to represent deleted data. They are necessary for eventual consistency and are used during the process of data cleanup and compaction.
Question 25. What is a lightweight transaction in Cassandra?
A lightweight transaction in Cassandra is a form of conditional update that ensures atomicity and isolation. It allows for conditional updates based on the current state of the data.
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