Developing Distributed Applications Using ZooKeeper Cognitive Class Exam Quiz Answers

Developing Distributed Applications
Using ZooKeeper Cognitive Class
Exam Quiz Answers
Module 1 – Introduction Zookeeper Quiz Answers – Cognitive Class

Question 1: What is NOT a benefit distributed systems offer over centralized systems?

• Price to achieve redundancy

• Redundancy

• Ease of developing your coordination service

• Scalability

Question 2: A ZooKeeper client can perform a read operation from any server in the ensemble, but
a write operation must go through the ZooKeeper leader and requires a majority consensus to
succeed. True or false?

• False

• True

Question 3: What’s the benefit of running ZooKeeper in Standalone mode over Replicated mode?

• Cheaper

• Resilience

• Simpler testing and learning

• High availability

Module 2 – The Zookeeper Data Model Quiz Answers – Cognitive Class

Question 1: Which of the following statements is true?

• A client reading the data stored at a znode can receive some of the data.

• ZooKeeper is designed for high-volume storage.

• The path to a znode must be expressed as a canonical, absolute, and slash-separated path.

• Znodes can be used to store data that exceeds 1MB.

Question 2: A znode can be in multiple states at the same time. True or false?

• False

• True

Question 3: Which of the following commands is used to retrieve the access control list of a
znode?

, • fetchACL

• setACL

• printACL

• getACL

Module 3 – Programming and Advance Topics Quiz Answers – Cognitive Class

Question 1: In addition to the 4 letter commands, JMX can be used to monitor ZooKeeper. True or
false?

• False

• True

Question 2: Which two authentication plugins are included with ZooKeeper?

• ip and MD5

• ip and identify

• digset and MD5

• ip and digest

Question 3: What are the bindings that ZooKeeper comes with out of the box?

• Ruby and Java

• Java and C#

• Python and C

• Java and C

Developing Distributed Applications Using ZooKeeper Final Exam Answers – Cognitive Class

Question 1: What is the primary purpose of ZooKeeper in the Hadoop architecture?

• To provide logging support for Hadoop jobs

• To support the execution of workflows consisting of a collection of actions

• To provide a centralized coordination service for distributed applications

• To move data into HDFS

Question 2: When executing ZooKeeper in Replicated mode, a new leader can be elected if the
former leader fails. True or false?

• True

• False

Question 3: Which of the following are consistency guarantees made by ZooKeeper? Select all that
apply.

• Atomicity