Apache Spark Certification Practice Test

Question: 1 / 400

What does the Spark web UI on port 4040 provide?

Error logs only

Useful information about the application running

The Spark web UI on port 4040 provides useful information about the application running in the Spark environment. When you launch a Spark application, the web UI becomes accessible and presents various metrics and details related to the application’s execution. This includes information such as the stages of job execution, the tasks that have completed, the amount of data being processed, and how resources are utilized throughout the execution.

The UI is essential for monitoring performance, debugging, and optimizing Spark applications. It allows developers and data engineers to analyze job execution timelines, resource consumption, and the performance of individual tasks, which helps in identifying bottlenecks and improving efficiency.

Other choices do not cover the comprehensive nature of the information available through the UI. It is not limited to error logs or system resource dashboards, nor does it solely focus on real-time code execution statistics without encompassing a broader scope of application performance metrics.

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A dashboard for system resources

Real-time code execution statistics

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