Developing Distributed Applications Using ZooKeeper cognitive class Exam Answers:-

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Course Name :- Developing Distributed Applications Using ZooKeeper

Module 1 :- Introduction Zookeeper

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

• Price to achieve redundancy
• Redundancy
• Ease of developing your own 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 Zoookeeper Data Model

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

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

Question3 : 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 cognitive class final Exam Answers:-

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
• Reliability
• Timeliness
• Release

Question 4. ZooKeeper guarantees simultaneously consistent cross-client views. True or false?

• True
• False

Question 5. ZooKeeper can be used to implement several use cases including

• Leader Election
• Queue Management
• Configuration Management
• Locking
• All of the above

Question 6 . A ZooKeeper client can maintain a list of servers to connect to, and the client will go through its list until it successfully connects to a ZooKeeper server. True or false?

• True
• False

Question 7 : ZooKeeper Watches can be used to

• Watch for failed MapReduce jobs
• Watch for changes to Hadoop configuration
• Watch for changes in the Hadoop Filesystem (HDFS)
• None of the above

Question 8 . If you want to be notified of a change in a ZooKeeper znode, you should use

• The ZooKeeper getData() method
• The ZooKeeper sync() method
• The ZooKeeper callback() method
• A ZooKeeper Watch

Question 9 . In ZooKeeper, if you want a znode to be deleted when the client session ends, you should create a

• Session znode
• Ephemeral znode
• Temp znode
• Persistent znode

Question 10. Using the –s parameter when creating a znode results in a

• Ephemeral znode
• Sequential znode
• Temp znode
• Session znode
• Persistent znode

Question 11 . Which of the ‘four letter word’ commands will show you the status of a ZooKeeper server?

• stat
• dump
• conf
• cons
• ruok

Question 12 . When using the ZooKeeper Java API, what do you need to implement in order to receive Watcher notifications?

• A constructor that calls the watch method
• A class that inherits from zNode
• The process method of the Watcher interface
• None of the above

Question 13.  In ZooKeeper, setting an ACL only pertains to the specific znode and is not recursive. True or false?

• True
• False

Question 14 . In ZooKeeper, what permission do you need to have in order to change the ACL on a znode?

• READ
• ADMIN
• WRITE
• DELETE
• CREATE

Question 15. You can plug in your own authentication scheme rather than using the ones provided out of the box by ZooKeeper. True or false?

• True
• False