Explanation:

In CloudHub 2.0, applications are deployed as replicas (across multiple nodes/containers). This introduces two critical challenges when dealing with large temporary files:

1. In-memory data does not persist across executions or replicas.
2. Object Store v2 is designed for small to medium-sized data (up to ~10MB), not for large files.

Hence, for large files (>10MB) and cross-execution persistence, best practice is:

✅ Store the actual file contents in external storage (e.g., Amazon S3, Azure Blob, etc.)
✅ Store the file reference (key, URI, metadata) in Object Store v2 so flows can:
➥ Retrieve metadata
➥ Check if file exists
➥ Access the file from external storage when needed

This approach is scalable, replica-safe, and aligned with MuleSoft CloudHub 2.0 architecture.

❌ Why other options are incorrect:

B. Use an in-memory Object Store
🔸 Wrong: In-memory Object Stores are not shared across replicas and are volatile — data is lost on restart or failover.

C. Store the key and full contents of the file in an Object Store
🔸 Wrong: Object Store v2 is not intended for large payloads. Storing >10MB in Object Store can cause failures or performance degradation.

D. Store the key and full contents of the file, caching the filename and location between requests
🔸 Wrong: This is vague and assumes local caching, which won’t persist across replicas or restarts.

🔗 Reference:
MuleSoft Docs – Object Store v2
CloudHub 2.0 Architecture
Best Practices for Large Payloads