Let me tell you about one of my least favorite things I like to see in PolyBase:
Error: Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster
This error is not limited to PolyBase but is instead an issue when trying to run MapReduce jobs in Hadoop. There are several potential causes, so let’s cover each of them as they relate to PolyBase and hopefully one of these solves your issue.
Click through for four potential solutions to what ails you.