Dealing with Concurrency

Parallel requests have been a reality on the web since day one — and are often ignored until, under high load, the first race conditions appear. When also using event-driven architectures, you should proactively think about asynchrony and parallelism.

This training teaches the key approaches to address competing access: locking strategies, mutex variants, and deliberately controlling parallelism when accessing data.

• Concurrency is everywhere — why this topic is often underestimated
• Implementing pessimistic locking with databases
• Using custom locks in MySQL
• External mutex locks and their pitfalls
• Optimistic locking
• Controlling parallelism with partitioning

This training is aimed at backend developers and software architects who deal with competing accesses, race conditions, and performance/consistency trade-offs — especially in the context of event-driven systems.

Ideal for teams who want to make their applications robust against concurrent write access.

Basic knowledge of relational databases and PHP is recommended.

Experience with queues is helpful but not required.

• You'll be able to identify and reproduce race conditions
• You'll know common locking approaches and where to apply them
• You'll understand typical challenges with external coordination mechanisms
• You'll learn methods to deliberately control parallelism