CASSANDRA Architecture and Data Model

Question 1

What is the primary data distribution mechanism in Apache Cassandra?

Accepted Answer

Consistent hashing with a token ring

Answer

Master-slave replication

Answer

Sharding by row key prefix

Answer

Round-robin assignment

Question 2

Which component in Cassandra is responsible for in-memory writes before they are flushed to disk?

Accepted Answer

MemTable

Answer

SSTable

Answer

CommitLog

Answer

Bloom Filter

Question 3

What does the term 'eventual consistency' mean in the context of Cassandra?

Accepted Answer

All replicas will converge to the same value given no new updates

Answer

All nodes are always in sync

Answer

Reads always return the latest write

Answer

Writes are synchronous across all replicas

Question 4

In Cassandra's data model, what is a 'partition key' used for?

Accepted Answer

Determining which node stores the data

Answer

Sorting rows within a partition

Answer

Defining secondary indexes

Answer

Setting the TTL on a row

Question 5

What is the purpose of a Bloom filter in Cassandra?

Accepted Answer

Quickly determine if an SSTable may contain a given partition key

Answer

Compress SSTables on disk

Answer

Enforce row-level security

Answer

Merge overlapping SSTables

Question 6

Which architecture model does Apache Cassandra follow?

Accepted Answer

Peer-to-peer (masterless)

Answer

Master-slave

Answer

Primary-secondary with arbiter

Answer

Hub-and-spoke