What configuration of the Scatter-Gather router executes routes in a sequential manner?

• A. Set a single route only
• B. Disable parallel processing
• C. Configure the routes to run in sequence using flow order
• D. Set the maxConcurrency of the Scatter-Gather to 1

Answer: (D)

Scatter-Gather runs the multiple routes in parallel by default, so to make them run one after another you need to limit how many routes can execute at the same time. Setting the maxConcurrency of the Scatter-Gather to 1 ensures that only a single route is processed at a time, forcing the execution to be sequential. This directly controls the degree of parallelism, which is what determines whether the routes run in parallel or in order.

The other ideas don’t reliably enforce a sequential flow. Using only a single route defeats the purpose of Scatter-Gather, since it would bypass the parallel routing concept. A generic “disable parallel processing” toggle isn’t a proper configuration knob for Scatter-Gather, and while you can influence order, the explicit and standard way to serialize execution is to set maxConcurrency to 1.