Spark jobs that are INSERTing data into NoSql DB having performance issues . It is not clear how much time is spent in Spark processing Vs NoSql INSERTs. Application code does NOT have additional logging steps. However, Dev-team claims YARN has detailed logs that can provide execution time of INSERT statements. The question is : Can YARN produce such detailed application level debug logs (eg., execution time for an INSERT) , while the application itself is NOT logging anything other than the default level of logging available in the framework (like job start and end times).