Answer / unahs

Invoking a service using a transformer, you can invoke multiple services in a single map step and every service is invoked using a separate thread thus executing parallely and improving performance.

Answer / tweety

While invoking a service as a transformer we can map only
the required fields.
IF we invoke a service directly , the pipeline values of
the called service will be included along with the current
pipeline value and have to drop the unwanted variables
explicitly.

Answer / siva subrahmanyam

1. Multiple services can be invoked via multiple threads that are executed in Parallel and thus Improved performance.

2. Also, the pipeline memory will be optimally used as the pipeline variables need not be carried over multiple flow steps.

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