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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
  • 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

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.

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