Course outline

01 · HTTP & REST APIs

02 · Databases & Persistence

03 · Authentication & Authorization

04 · API Design & gRPC

05 · Caching, Queues & Background Jobs

06 · Production-Ready Services

07 · Advanced Auth & Tenant Security

08 · Performance & Caching at Scale

09 · Testing & Release Confidence

Stage 3 · Build

Performance & Caching at Scale

Connection Backpressure

Tune HTTP clients, database pools, worker limits, queues, and timeouts to prevent overload.

7 min readBuilding Backend ApplicationsBuild

What Is Backpressure

Backpressure propagates overload signals from a saturated component to its callers. Without backpressure, a slow database causes goroutine accumulation, memory exhaustion, and cascading failure. Limits and timeouts create backpressure.

HTTP Client Limits

Goproduction-http-client.go

13 linesLn 1, Col 1Go

MaxConnsPerHost limits concurrent connections to a single host. Without it, one slow upstream can exhaust your goroutine pool. IdleConnTimeout closes unused connections.

Database Pool Limits

Godatabase-pool-with-backpressure.go

23 linesLn 1, Col 1Go

WaitCount > 0 means queries are waiting for a connection. This is backpressure. If sustained, increase MaxOpenConns or optimize slow queries.

Worker Limits

Gobounded-worker-pool.go

23 linesLn 1, Col 1Go

The channel buffer provides backpressure. When the buffer is full, Submit blocks. This prevents unbounded goroutine creation and protects downstream services.

Queue Backpressure

Message queues provide natural backpressure. Producers block when the queue is full. Consumers process at their own pace. This smooths out traffic spikes.

Set queue size limits to bound memory usage.
Use blocking publishes to create backpressure on producers.
Monitor queue depth to detect processing bottlenecks.
Use dead-letter queues for messages that cannot be processed.

Timeout Strategy

Gocascading-timeouts.go

25 linesLn 1, Col 1Go

Timeouts cascade: HTTP server (10s) > handler (8s) > database (3s) > external API (4s). Each timeout is shorter than its parent. This prevents one slow component from consuming all time.

Always set timeouts

Without timeouts, a slow database or API call holds a goroutine indefinitely. Under load, this exhausts goroutines and crashes the server. Every outbound call needs a timeout.

Mark this lesson complete to store local progress and unlock a cleaner resume path the next time you visit.

Course outline

01 · HTTP & REST APIs

02 · Databases & Persistence

03 · Authentication & Authorization

04 · API Design & gRPC

05 · Caching, Queues & Background Jobs

06 · Production-Ready Services

07 · Advanced Auth & Tenant Security

08 · Performance & Caching at Scale

09 · Testing & Release Confidence

Stage 3 · Build

Performance & Caching at Scale

Connection Backpressure

Tune HTTP clients, database pools, worker limits, queues, and timeouts to prevent overload.

7 min readBuilding Backend ApplicationsBuild

What Is Backpressure

HTTP Client Limits

Goproduction-http-client.go

13 linesLn 1, Col 1Go

MaxConnsPerHost limits concurrent connections to a single host. Without it, one slow upstream can exhaust your goroutine pool. IdleConnTimeout closes unused connections.

Database Pool Limits

Godatabase-pool-with-backpressure.go

23 linesLn 1, Col 1Go

WaitCount > 0 means queries are waiting for a connection. This is backpressure. If sustained, increase MaxOpenConns or optimize slow queries.

Worker Limits

Gobounded-worker-pool.go

23 linesLn 1, Col 1Go

The channel buffer provides backpressure. When the buffer is full, Submit blocks. This prevents unbounded goroutine creation and protects downstream services.

Queue Backpressure

Message queues provide natural backpressure. Producers block when the queue is full. Consumers process at their own pace. This smooths out traffic spikes.

Set queue size limits to bound memory usage.
Use blocking publishes to create backpressure on producers.
Monitor queue depth to detect processing bottlenecks.
Use dead-letter queues for messages that cannot be processed.

Timeout Strategy

Gocascading-timeouts.go

25 linesLn 1, Col 1Go

Timeouts cascade: HTTP server (10s) > handler (8s) > database (3s) > external API (4s). Each timeout is shorter than its parent. This prevents one slow component from consuming all time.

Always set timeouts

Without timeouts, a slow database or API call holds a goroutine indefinitely. Under load, this exhausts goroutines and crashes the server. Every outbound call needs a timeout.

Mark this lesson complete to store local progress and unlock a cleaner resume path the next time you visit.