Which statement about batch processing semantics with limited threads is true?

Which statement about batch processing semantics with limited threads is true?

• A. Some records may still be processed in step 1 even after others have moved to step 2
• B. All records must complete step 1 before anyone moves to step 2
• C. Step 2 can never start until step 1 is fully finished
• D. Records are always processed only in the second step

Answer: (A)

Batch processing with limited threads often uses a pipelined, multi-stage execution where work can overlap between stages. Because there are only a finite number of threads, the system processes some records in the first stage while others have already moved to the second stage. This overlap is exactly what improves throughput in constrained environments. So the statement that some records may still be in the first stage even after others have moved to the second stage is true. This also explains why the other ideas aren’t correct: the second stage can begin before every record has finished the first stage, since progress is overlapped rather than serialized; not every record must finish the first stage before anyone advances; and records are processed through both stages, not exclusively in the second stage.

Batch processing with limited threads often uses a pipelined, multi-stage execution where work can overlap between stages. Because there are only a finite number of threads, the system processes some records in the first stage while others have already moved to the second stage. This overlap is exactly what improves throughput in constrained environments. So the statement that some records may still be in the first stage even after others have moved to the second stage is true.

This also explains why the other ideas aren’t correct: the second stage can begin before every record has finished the first stage, since progress is overlapped rather than serialized; not every record must finish the first stage before anyone advances; and records are processed through both stages, not exclusively in the second stage.