huong-dan-cham-phan-b

id: huong-dan-cham-phan-b title: Huong dan cham Phan B slug: /dap-an/huong-dan-cham-phan-b

Huong dan cham Phan B

Cau 9 - Node.js Event Loop

Ung vien dat diem tot khi neu duoc:

• Doan xu ly CPU dong bo chiem main thread.
• Event loop khong the xu ly request khac trong thoi gian do.
• Chi them async khong lam tac vu CPU chay song song.
• Co the xu ly bang Worker Threads, Child Process, job queue, background worker, chia nho du lieu, toi uu thuat toan hoac chay nhieu process/container.

Thang diem

Tieu chi	Diem
Xac dinh CPU-bound blocking	5
Hieu async khong giai quyet CPU-bound	4
Dua ra hai giai phap hop ly	6

Cau 10 - MongoDB Concurrent Update

Dap an tham khao:

const result = await products.updateOne(
  {
    _id: productId,
    stock: {
      $gte: quantity,
    },
  },
  {
    $inc: {
      stock: -quantity,
    },
  },
);

if (result.modifiedCount !== 1) {
  throw new Error("Product not found or insufficient stock");
}

Ung vien can nhan ra:

• Hai request co the cung doc stock = 5.
• Ca hai cung vuot qua dieu kien kiem tra.
• $set dua tren du lieu da doc co the gay lost update.
• Dieu kien ton kho va thao tac tru kho phai nam trong cung mot atomic operation.

Thang diem

Tieu chi	Diem
Nhan dien race condition	5
Co dieu kien stock >= quantity	4
Dung $inc	3
Kiem tra modifiedCount	3

Cau 11 - AI Engineering

Skill

Nen chua:

• Cau truc project
• Naming convention
• Controller, service va repository pattern
• Validation convention
• Authentication va authorization
• Error handling
• Audit log
• Quy chuan test
• Thu vien duoc phep su dung
• File duoc phep chinh sua
• Definition of Done

Agent workflow

1. Doc task va acceptance criteria.
2. Khao sat repository.
3. Tim module tuong tu.
4. Lap ke hoach.
5. Liet ke file can sua.
6. Implement trong pham vi.
7. Viet test.
8. Chay type-check, lint va test.
9. Review diff.
10. Bao cao thay doi va rui ro.

MCP

Co the cap quyen truy cap:

• Repository filesystem
• Git hoac GitHub
• Task management
• API documentation
• Database schema
• Test runner
• Linter
• TypeScript compiler
• Log o che do read-only

Phai xin xac nhan truoc khi

• Xoa file hoac du lieu
• Cai hoac nang cap dependency lon
• Chay migration
• Truy cap secret
• Force push
• Merge vao main
• Deploy production
• Sua CI/CD
• Chay lenh shell nguy hiem

Thang diem

Tieu chi	Diem
Hieu dung Skill	4
Agent co workflow ro rang	4
Hieu dung MCP	4
Co gioi han quyen AI	3