Does Scatter-Gather support transactions?

• A. No
• B. Yes, and paths are run in parallel
• C. Yes, but paths aren't run simultaneously
• D. Only in clustered environments

Answer: (C)

The key idea is how transactions and parallel routing interact in Scatter-Gather. In Mule, a transaction binds work to a single thread. If Scatter-Gather runs its paths in parallel, each path typically executes on its own thread, which prevents all the work from sharing one global transaction boundary. To have all the operations inside the same transaction, the paths must be executed sequentially, not in parallel. That’s why Scatter-Gather can participate in a transaction, but only when the paths aren’t run simultaneously. If you need a single atomic unit across all paths, configure Scatter-Gather to run sequentially; parallel mode would mean separate transactions per path.