Booking conflict resolution in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is booking conflict resolution in system design?

Booking conflict resolution is the process of managing overlapping or conflicting booking requests to ensure that no two bookings occupy the same resource at the same time.

intermediate

Name a common technique to prevent booking conflicts in real-time systems.

Using locks or transactions to ensure atomicity when checking and creating bookings prevents conflicts by making sure only one booking can be confirmed for a resource at a time.

intermediate

Why is optimistic concurrency control useful in booking systems?

Optimistic concurrency control allows multiple users to attempt bookings simultaneously and only checks for conflicts at commit time, improving performance while still preventing conflicts.

beginner

Explain the role of a booking calendar or timeline in conflict resolution.

A booking calendar or timeline visually represents booked and free time slots, helping the system quickly detect overlaps and prevent double bookings.

advanced

What is a deadlock and how can it affect booking conflict resolution?

A deadlock occurs when two or more processes wait indefinitely for each other to release locks, causing the booking system to freeze or fail to resolve conflicts properly.

Which method helps avoid booking conflicts by ensuring only one booking is processed at a time?

A Sharding

B Caching

C Load balancing

D Locking

Locking ensures that only one process can access the booking resource at a time, preventing conflicts.

What does optimistic concurrency control do in booking systems?

A Prevents all concurrent bookings

B Allows concurrent attempts and checks conflicts at commit

C Locks the entire booking calendar

D Queues all booking requests

Optimistic concurrency control lets multiple users try bookings simultaneously and checks for conflicts only when saving.

What is a common symptom of deadlock in booking conflict resolution?

A System freezes or stalls

B More available slots

C Faster booking confirmations

D Automatic conflict resolution

Deadlocks cause the system to freeze because processes wait forever for each other to release locks.

Which data structure helps visualize and detect booking conflicts easily?

A Calendar or timeline

B Queue

C Stack

D Hash map

Calendars or timelines show booked and free slots, making conflict detection straightforward.

What is the main goal of booking conflict resolution?

A Allow double bookings for popular slots

B Maximize number of bookings regardless of overlap

C Prevent overlapping bookings on the same resource

D Ignore conflicts and notify users later

The goal is to prevent overlapping bookings so that resources are not double-booked.

Describe how locking mechanisms help resolve booking conflicts.

Think about how only one person can book a seat at a time.

Explain the difference between optimistic and pessimistic concurrency control in booking systems.

One trusts users to not conflict, the other blocks access upfront.