Steps cannot run in parallel

If you are using the Spark engine to run a transformation with a step that cannot run in parallel, it generates errors in the log.

Some steps cannot run in parallel (on multiple nodes in a cluster), and will produce unexpected results. However, these steps can run as a coalesced dataset on a single node in a cluster. To enable a step to run as a coalesced dataset, add the step ID as a property value in the configuration file for using the Spark engine.