Apache Spark Certification Practice Test

Question: 1 / 400

If multiple SparkContexts are running on the same host, which ports will they bind to?

High-numbered random ports

Fixed ports starting from 8080

Successive ports beginning with 4040

When multiple SparkContexts are running on the same host, they will bind to successive ports, starting at 4040. This behavior is designed to avoid conflicts and ensure that each Spark application can be monitored independently through its web UI. The default port for the Spark web UI is 4040, and if that port is already in use by another active SparkContext, the next one will attempt to bind to 4041, followed by 4042, and so on.

This systematic allocation of ports allows multiple applications to coexist on the same machine without interfering with one another, providing flexibility and ease of use for developers working with multiple Spark applications in the same environment. Thus, using successive ports is a crucial aspect of Spark's ability to manage resources effectively on a single host.

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Unassigned ports only

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