¿Cómo encuentro mi URL maestra de Spark?

How do I find my Spark master URL?

You can also find this URL on the master’s web UI, which is http://localhost:8080 by default. Once you have started a worker, look at the master’s web UI (http://localhost:8080 by default). You should see the new node listed there, along with its number of CPUs and memory (minus one gigabyte left for the OS).

Configure Standalone Spark

1. Verify that the Spark master URL is set in the Admin UI under System Configuration > Server Configs > Spark Integration > Spark master URL.
2. Create a Spark home environment variable.
3. Configure options in Spark.
4. Start and Validate Spark.
5. Test Spark.

Spark also has master URLs specific to supported resource managers. The first one is mesos://. Its address, composed of host and port, must point to started MesosClusterDispatcher. Another possible resource manager is YARN and Spark program is submitted to it when master URL is equal to yarn.

Spark Master (often written standalone Master) is the resource manager for the Spark Standalone cluster to allocate the resources (CPU, Memory, Disk etc…) among the Spark applications. The resources are used to run the Spark Driver and Executors.

You can access this interface by simply opening http://:4040 in a web browser. If multiple SparkContexts are running on the same host, they will bind to successive ports beginning with 4040 (4041, 4042, etc). Note that this information is only available for the duration of the application by default.

So, how do you run the spark in local mode? It is very simple. When we do not specify any –master flag to the command spark-shell, pyspark, spark-submit or any other binary, it is running in local mode. Or we can specify –master option with local as argument which defaults to 1 thread.

If you are running the Spark application locally, Spark UI can be accessed using the http://localhost:4040/ . Spark UI by default runs on port 4040 and below are some of the additional UI’s that would be helpful to track Spark application.