Which performance topic enables parallel execution and controls max concurrency?

• A. Scatter-Gather
• B. Batch
• C. Logging
• D. Transformation

Answer: (A)

Parallel execution and controlling max concurrency come from a routing pattern that sends a single message to multiple targets at the same time and then brings the results back together. Scatter-Gather does exactly this: it splits the incoming message to several routes so they run in parallel, and then it aggregates the responses. This setup lets you increase throughput and reduce latency when you need input from several services, and you can tune how many routes run concurrently to avoid overloading downstream systems.

Logging simply records information about the message flow and does not involve parallel routing. Transformation changes the message content within a single flow, again not about parallel execution to multiple destinations. Batch processes large collections of records in chunks and has its own concurrency considerations, but its purpose isn’t to parallelize the dispatch of one message to multiple endpoints and then aggregate those results.