Apache Spark Certification Practice Test

The default URL for the client GUI in Apache Spark is set to "localhost:8080." When you start a Spark application, the web UI is made available on port 8080 of the localhost. This web UI provides important information about the Spark application, such as the application's status, metrics, and job execution information. It allows developers and administrators to monitor and debug Spark applications from a web browser conveniently.

Understanding this configuration is vital for effectively using Spark, as it provides real-time insights into the application's performance and resource usage. While other options may represent different ports or addresses, they do not correspond to the default Spark web UI, which is consistently accessible at "localhost:8080."