I believe you misunderstand the fundamentals of delta tables. `maxFilesPerTrigger` has nothing to do with how many rows you will process at the same time. And if you really want to control the number of records per file, then you need to adapt the writer accordingly. Besides that fact that having two records per file is a very bad idea for multiple reasons. Depending on your load, you will end up with thousand of small files and dozens of useless history entries in the delta table log.

Of course I don't know your use case behind it, but I'm pretty sure that you don't want to process two rows at the same. Keep in mind that you're in a big data environment, and it's designed to process millions of rows at the same time.