MS-DS Master of Data science Big Data 2

Question 1

In the Lambda architecture, which layer handles real-time, low-latency data processing?

Accepted Answer

Speed layer

Answer

The speed layer processes incoming data in real time to provide low-latency views that complement the batch layer.

Question 2

Which compression codec is best suited for Hadoop workloads that require splittable compressed files?

Accepted Answer

Bzip2

Answer

Bzip2 produces splittable compressed files, allowing Hadoop to divide them across multiple mappers.

Question 3

In Apache Kafka, what guarantees message ordering within a topic?

Accepted Answer

Partition assignment

Answer

Kafka guarantees ordering only within a single partition, so messages with the same key are routed to the same partition.

Question 4

Which HBase component stores the write-ahead log (WAL) to ensure durability?

Accepted Answer

HLog

Answer

The HLog (WAL) records all mutations before they are applied to the MemStore, enabling recovery after a crash.

Question 5

The CAP theorem states that a distributed system can simultaneously guarantee at most how many of its three properties?

Accepted Answer

2

Answer

CAP theorem proves that during a network partition, a system must sacrifice either consistency or availability, so only 2 of 3 properties can be fully guaranteed.

MS-DS Master of Data science Practice Test

MS-DS Master of Data science Practice Test

MS-DS Master of Data science Big Data 2