WhatsApp
How WhatsApp Served Millions of Connections per Server With a Tiny Team
How Erlang's lightweight process model and deep FreeBSD tuning let WhatsApp run hundreds of millions of users' traffic with a remarkably small team.
3 min read
Tag
Concurrency
8 articles
Spring Boot
@Scheduled and @Async: The Thread Pools You Can't Leave on Default
Why the default executors behind @Scheduled and @Async are wrong for production, and how to configure thread pools that actually match your workload.
3 min read
Databases
Understanding and Avoiding Database Deadlocks
Why deadlocks happen even in well-designed schemas, how to read a deadlock log, and the lock-ordering habits that prevent them.
3 min read
Java
A Practical Tour of java.util.concurrent
Beyond synchronized and Thread, java.util.concurrent has a purpose-built tool for nearly every coordination problem. Here's when to reach for each.
3 min read
Java
CompletableFuture Composition Patterns That Actually Work
CompletableFuture's API surface is huge and easy to misuse. These are the composition patterns that hold up in real asynchronous pipelines.
2 min read
Java
Virtual Threads in Java: What Actually Changes
Virtual threads remove the cost of blocking, not the need for careful concurrency design. Here's exactly what improves and what stays your problem.
3 min read
Databases
MVCC: How Postgres Handles Concurrency Without Locking Everything
How Postgres lets readers and writers proceed without blocking each other, what a snapshot actually is, and where MVCC's costs show up later.
3 min read
Databases
Transaction Isolation Levels and the Anomalies They Allow
A tour of READ UNCOMMITTED through SERIALIZABLE, the dirty reads and phantom rows each level permits, and how to pick one without guessing.
3 min read