Hi, Do you have any general information about the types of tasks that the driver performs after a job completes? I do not have a comprehensive list of such tasks, this is just what we usually observe through cases and slowness reports. Of course there may be completely different tasks what the driver does - any custom spark code which does not involve parallel execution / data processing might run on the Spark driver side only, for example connecting to an external system through JDBC, or doing some computation (not with RDDs or DataFrames). ... View more