Practice Issues in Recording a Global State: The 'Inconsistent Snapshot' Problem - 2.2 | Week 4: Classical Distributed Algorithms and the Industry Systems | Distributed and Cloud Systems Micro Specialization
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2.2 - Issues in Recording a Global State: The 'Inconsistent Snapshot' Problem

Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is a global state in a distributed system?

πŸ’‘ Hint: Think about what a single point of observation would consist of.

Question 2

Easy

Define the term 'inconsistent snapshot.'

πŸ’‘ Hint: Consider the implications of incomplete or contradictory recordings.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is the main challenge in recording a global state in distributed systems?

  • Data loss
  • Inconsistent snapshots
  • Network failure

πŸ’‘ Hint: Consider what happens when different processes record their states at different times.

Question 2

The Chandy-Lamport algorithm uses which type of message to ensure consistency?

  • ACK
  • MARKER
  • ROLLBACK

πŸ’‘ Hint: Think of what kind of message helps mark points in time.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Suppose you have three processes where Process A sends a message to Process B, and after some time, Process C sends a message to Process A. If Process A records its state after sending but before receiving Process C's message, analyze the global state that could emerge.

πŸ’‘ Hint: How do the sequences of events help create this scenario?

Question 2

Formulate a new approach to improve the consistency of snapshots across a large distributed network. Consider the limitations of current algorithms.

πŸ’‘ Hint: What mechanisms do consensus protocols use that could be adapted to snapshot recording?

Challenge and get performance evaluation