Go Concurrency Review

Concurrency in Go is powerful and deceptively easy to get wrong. These patterns prevent goroutine leaks, data races, and deadlocks.

1. Goroutine Lifecycle Management

EVERY goroutine MUST have a clear termination path. No fire-and-forget.

Use errgroup for coordinated goroutines:

g, ctx := errgroup.WithContext(ctx)

g.Go(func() error {
    return fetchUsers(ctx)
})

g.Go(func() error {