Description
I think this was mainly caused by (Edit: bug is unrelated to the aforementioned bug.)SPARK-15951; that changed modified the executors page to read data from the REST API, and in 2.1 and 2.2 the REST API does not return the driver as an executor. So no information about the driver is shown in that page at all.
In 2.3 the driver executor is listed, but it is doesn't have any log links.