If there is an error in an MR job, you usually want to know how many times it happened. I think you should add counters here (and in every other bulk importer that has a potential failure scenario -aka all of them). One for each type of error would be good:  unknown entityid and missing field.

I like counters for a few reasons: 1) they show up in the summary of the job. 2) If you are missing something, your next question is almost always, "how many times was it missing?"

This is a minor change, but one that should happen in a lot of places. Let me know if i can help you with this.