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Developing Distributed Applications Using ZooKeeper cognitive class Exam Answers:-

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

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

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