The Executors tab of Spark UI provides information about memory, cores, and other resources being used by executors. This information is available both at each executor level and an aggregated level. It is accessible at http://localhost:4040/executors/.

All the information on the Executors tab is retrieved using the org.apache.spark.ui.exec.ExecutorsListener class.

Also, this tab provides an option to make a Thread Dump of the executor process, which is very useful for debugging the issue. The user can turn off this option by setting spark.ui.threadDumpsEnabled to false (by default, this is set to true).