Parallel processing in mule 4

1. What is parallel processing in Mule?
2. What is the use of parallel foreach in Mule 4?
3. What is the difference between parallel foreach and scatter gather?
4. What is the difference between parallel foreach and batch processing?

What is parallel processing in Mule?

Parallel processing is a technique where a list of actions can be executed concurrently but independently and the parent flow will not continue until all actions are completed. This can be done in Mule using Scatter and Gather flow control.

What is the use of parallel foreach in Mule 4?

The Parallel For Each scope enables you to process a collection of messages by splitting the collection into parts that are simultaneously processed in separate routes within the scope of any limitation configured for concurrent-processing.

What is the difference between parallel foreach and scatter gather?

For example, if there are 10 elements and the maximum number of processes is set to 2, a Parallel For-Each card processes two elements at a time, five times. Scatter Gather runs two or more parallel processes, called routes. When all routes are finished, the results from each route are gathered into a new payload.

What is the difference between parallel foreach and batch processing?

Memory footprint: Since you said you have millions of records to process, parallel for each will aggregate all the processed records at the end and can possibly cause Out Of Memory. Batch job instead provides a BatchResult in the on complete phase where you can get the count of failures and success.