Spark number of cores used by driver

Question

I can set number of cores using spark.driver.cores for driver in case of cluster mode. But how many cores are used in case of client and local mode for driver

Answer 1

If you are running your application locally with master local[*], Here * mention they will use all free cores in your local system and if you are using the local[n], Here n is number of cores you want to use in your application. Its a core which is used by your application in local mode because when you run your application in local driver and executers are started in single JVM.