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Technical Analysis - Race Condition Challenge

Instructions

Complete this document with your detailed technical analysis of the race condition problem and your proposed solutions.

Part 1: Problem Analysis (45-60 minutes)

1.1 Root Cause Analysis

Describe in detail why the race condition occurs:

[Your answer here]

Create a sequence diagram or timeline showing how 3 concurrent threads cause data loss:

text [Your diagram here - you can use ASCII art, mermaid syntax, or attach an image]

Identify all critical sections in the code:

[Your answer here]

Calculate the probability of collision with N concurrent operations:

[Your mathematical analysis here]

1.2 Impact Assessment

What are the business consequences of this race condition?

[Your answer here]

Which scenarios are most likely to trigger this issue in production?

[Your answer here]

How would you detect this issue in production?

[Your answer here]

Part 2: Solution Design (90-120 minutes)

Design 2-3 different solutions to fix this race condition

For each solution, provide:

  • Detailed architecture
  • Pseudocode or implementation approach
  • Pros and cons
  • Performance implications
  • Complexity analysis

Solution 1: [Name your approach]

Architecture Overview:

[Your description here]

Implementation Approach:

csharp // Pseudocode or key code snippets

Pros:

  • [List advantages]

Cons:

  • [List disadvantages]

Performance Impact:

  • Throughput: [Your analysis]
  • Latency: [Your analysis]
  • Resource usage: [Your analysis]

Edge Cases Handled:

  • [List edge cases this solution handles]

Edge Cases NOT Handled:

  • [List limitations]

Solution 2: [Name your approach]

Architecture Overview:

[Your description here]

Implementation Approach:

csharp // Pseudocode or key code snippets

Pros:

  • [List advantages]

Cons:

  • [List disadvantages]

Performance Impact:

  • Throughput: [Your analysis]
  • Latency: [Your analysis]
  • Resource usage: [Your analysis]

Edge Cases Handled:

  • [List edge cases this solution handles]

Edge Cases NOT Handled:

  • [List limitations]

Solution 3 (Optional): [Name your approach]

Architecture Overview:

[Your description here]

Implementation Approach:

csharp // Pseudocode or key code snippets

Pros:

  • [List advantages]

Cons:

  • [List disadvantages]

Performance Impact:

  • Throughput: [Your analysis]
  • Latency: [Your analysis]
  • Resource usage: [Your analysis]

Edge Cases Handled:

  • [List edge cases this solution handles]

Edge Cases NOT Handled:

  • [List limitations]

Part 3: Comparative Analysis (45-60 minutes)

3.1 Solution Comparison

Criteria Solution 1 Solution 2 Solution 3
Complexity [Your rating] [Your rating] [Your rating]
Performance [Your rating] [Your rating] [Your rating]
Scalability [Your rating] [Your rating] [Your rating]
Reliability [Your rating] [Your rating] [Your rating]
Implementation Time [Your estimate] [Your estimate] [Your estimate]
Maintenance Cost [Your estimate] [Your estimate] [Your estimate]

3.2 Recommended Solution

Which solution do you recommend for production and why?

[Your detailed recommendation here]

What are the trade-offs you're accepting with this choice?

[Your answer here]

Part 4: Production Considerations (30-45 minutes)

4.1 Failure Scenarios

What happens if Redis becomes unavailable during an update?

[Your answer here]

How would you handle partial failures?

[Your answer here]

What's your retry strategy?

[Your answer here]

4.2 Observability

What metrics would you track?

[Your answer here]

What alerts would you set up?

[Your answer here]

How would you debug issues in production?

[Your answer here]

4.3 Deployment Strategy

How would you roll out this fix to production?

[Your answer here]

What's your rollback plan if issues arise?

[Your answer here]

How would you validate the fix in production?

[Your answer here]

4.4 Testing Strategy

What additional tests would you add beyond the existing ones?

[Your answer here]

How would you test this under realistic production load?

[Your answer here]

Part 5: Implementation Plan (15-30 minutes)

5.1 Steps to Implement Your Chosen Solution

  1. [Step 1]
  2. [Step 2]
  3. [Step 3] ...

5.2 Estimated Implementation Time

Total time to implement: [Your estimate]

Breakdown:

  • Core implementation: [Time]
  • Tests: [Time]
  • Documentation: [Time]
  • Code review cycles: [Time]

Final Notes

Any additional observations or considerations:

[Your notes here]