Breaking News

Developing Distributed Applications Using ZooKeeper Cognitive Class Exam Quiz Answers

Developing Distributed Applications Using ZooKeeper Cognitive Class Certification Answers

Developing Distributed Applications Using ZooKeeper Cognitive Class Exam Quiz Answers

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

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

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

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

Introduction to Developing Distributed Applications Using ZooKeeper

Apache ZooKeeper is a distributed coordination service widely used for building distributed systems and applications. It provides a centralized repository and a set of primitives for distributed coordination and synchronization. Below is a general guide on how to develop distributed applications using ZooKeeper.

1. Understanding ZooKeeper Basics:

  • Nodes (ZNodes): ZooKeeper’s data model is similar to a file system, with nodes (ZNodes) organized in a hierarchical structure.
  • Watches: Clients can set watches on ZNodes to receive notifications when the data associated with the node changes.
  • Consistency: ZooKeeper provides strong consistency guarantees, making it suitable for coordination tasks.

2. Setting Up ZooKeeper:

  • Download and install ZooKeeper from the official Apache ZooKeeper website.
  • Configure ZooKeeper ensemble (cluster) by setting up multiple nodes.

3. ZooKeeper APIs:

  • Use the ZooKeeper client library in your programming language (Java, Python, etc.).
  • Connect to the ZooKeeper ensemble using the ZooKeeper client.
  • Create, read, update, and delete ZNodes.

4. Distributed Locks with ZooKeeper:

  • ZooKeeper can be used to implement distributed locks to ensure mutually exclusive access to a resource.
  • Create an ephemeral ZNode as a lock. The client holding the lock continues to hold it until it releases the lock or disconnects.

5. Configuration Management:

  • Use ZooKeeper for configuration management in distributed systems.
  • Store configuration parameters as ZNodes, and clients can watch for changes to adapt dynamically.

6. Leader Election:

  • Implement leader election using ZooKeeper for scenarios where only one node should perform a specific task at a time.

7. Error Handling and Connection Management:

  • Implement robust error handling and connection management to handle network partitions and other issues gracefully.

8. Testing:

  • Develop comprehensive unit tests to ensure the reliability and correctness of your distributed application.

9. Documentation:

  • Document the ZooKeeper integration in your application for future maintenance and collaboration.

10. Monitoring and Metrics:

  • Implement monitoring and metrics to keep track of ZooKeeper and your application’s health.

11. Security Considerations:

  • Ensure proper security configurations and access controls for ZooKeeper.

12. Scaling:

  • Consider the scalability aspects of your application and ZooKeeper ensemble as the system grows.

13. Logging:

  • Use logging to capture events and errors for debugging and monitoring purposes.

14. Maintenance:

  • Regularly review and update your ZooKeeper usage as the requirements of your distributed application evolve.

About Clear My Certification

Check Also

Controlling Hadoop Jobs using Oozie Cognitive Class Exam Quiz Answers

Controlling Hadoop Jobs using Oozie Cognitive Class Exam Quiz Answers

Enroll Here: Controlling Hadoop Jobs using Oozie Cognitive Class Exam Quiz Answers Controlling Hadoop Jobs …

Leave a Reply

Your email address will not be published. Required fields are marked *