What are event logs in Spark?

Event logs in Spark are log files that record detailed information about the various stages and tasks performed during the execution of a Spark application. These logs include information such as the start of Spark jobs, task execution, data reading and writing, etc., which can help users understand the progress of Spark application execution, optimize performance, and debug issues. Typically, Spark event logs can be viewed and analyzed through either the Spark History Server or the Spark Web interface. Spark event logs are extremely useful for debugging and optimizing large-scale data processing tasks.