Architecture Intermediate

Bulkhead Pattern — Failure Isolation¶

BulkheadResilienceIsolation 3 min read

Resource isolation to prevent cascading failures. Thread pools, connection pools.

Principle¶

Like watertight compartments in a ship — if one compartment floods, the others stay dry. Each dependency gets its own resource pool.

Implementation¶

class BulkheadedService {
    orderPool = new ConnectionPool({ maxSize: 20 });
    paymentPool = new ConnectionPool({ maxSize: 10 });

    async getOrder(id) {
        return this.orderPool.execute(() =>
            fetch('http://order-service/orders/' + id)
        );
    }
    async processPayment(data) {
        // Slow payment won't exhaust the order pool
        return this.paymentPool.execute(() =>
            fetch('http://payment-service/pay', { method: 'POST', body: JSON.stringify(data) })
        );
    }
}

Types¶

• Thread Pool Isolation — dedicated thread pool per dependency
• Semaphore Isolation — limiting concurrent requests
• Process Isolation — containers with resource limits

Summary¶

Bulkhead isolates dependency failures. Combine with Circuit Breaker for maximum resilience.

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