SAA-C03 Q107 · Cost

Question

A company has a large data workload that runs for 6 hours each day. The company cannot lose any data while the process is running. A solutions architect is designing an Amazon EMR cluster configuration to support this critical data workload. Which solution will meet these requirements MOST cost-effectively?

Accepted Answer

Answer B satisfies every requirement:

**1. Transient cluster (cost optimization):**
- The workload runs only 6 hours/day. A transient cluster starts, runs the job, and automatically terminates when done. This means you pay for only ~6 hours instead of 24 hours. This is the single biggest cost saving factor.

**2. Primary node and core nodes on On-Demand (no data loss):**
- The **primary node** (formerly master node) orchestrates the entire cluster — it must never be interrupted.
- **Core nodes** store data in HDFS and run tasks. If a core node is interrupted (Spot termination), you lose HDFS data blocks. Since the company 'cannot lose any data,' core nodes MUST be On-Demand.

**3. Task nodes on Spot Instances (additional cost savings):**
- **Task nodes** only run computation — they do NOT

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🏗️ Architecture

⚙️ Operations

💰 Cost

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