What is the file path to save the Spark worker hostnames?

The correct file path for saving the Spark worker hostnames is "conf/slaves". In Apache Spark, this file is used to specify the hostnames or IP addresses of the worker nodes in a Spark cluster. By listing all the worker nodes in the "slaves" file, Spark can easily manage and distribute tasks across those nodes during job execution.

Using the "slaves" file is part of the configuration process for setting up a Spark cluster, particularly in standalone mode. It essentially informs the Spark master which nodes are available for processing tasks, enabling efficient resource management and workload balancing.

Other options do not pertain to saving Spark worker hostnames. For example, "conf/nodes" and "bin/workers" are not standard configurations in Spark for this purpose. The "etc/hosts" file is used for hostname resolution by the operating system and does not specifically relate to Spark's configuration or management of worker nodes.