SAP-C02 Q595 · Storage

Question

An EC2-based ticketing service pulls a frequently updated pricing file (stored in S3) on startup. Sometimes EC2s have stale pricing, causing charge issues.

Accepted Answer

**Option C: Use Mountpoint for Amazon S3 to mount the pricing file to EC2.**

**The Root Problem:** EC2 instances pull the pricing file only at startup. If the file is updated in S3 after the instance has already started, the instance continues using stale data until it restarts.

**Why Mountpoint for S3 solves this:**
1. **Mountpoint for Amazon S3** is an open-source file client that mounts an S3 bucket as a local file system on EC2 instances.
2. When the application reads the pricing file via the mount point, it reads **directly from S3 in real-time** — there is no local cached copy that goes stale.
3. Every file read operation translates to an S3 API call, so the application always gets the **latest version** of the pricing file.
4. **No code changes needed** — the application still rea

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🏗️ Architecture

⚙️ Operations

💰 Cost

🔒 Security

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