Your job reads from a file using a Sequential File stage running sequentially. You are using a Transformer stage following the Sequential File stage to format the data in some of the columns. What is the default (Auto) partitioning method?

When data is read sequentially from a Sequential File stage, the default (Auto) partitioning method is Round Robin. This distributes rows evenly across available partitions, which is appropriate after a sequential read where there's no inherent partitioning key. 'Same' would keep all data on one partition, defeating the purpose of parallel processing.