Brennan Tolman08/14/2023, 7:37 PM
Marvin08/14/2023, 7:38 PM
command for this, which allows you to submit a Spark application for execution on your cluster. You can call this command from your Prefect task using Python's
module. 2. Schedule your Prefect flow: Once you have your Prefect task set up, you can schedule it to run at your desired frequency using Prefect's scheduling capabilities. 3. Monitor your Spark jobs: You can monitor the status of your Spark jobs from the Prefect UI. If a job fails, Prefect can alert you and even retry the job based on your preferences. Remember, this is a very high-level approach. The specifics will depend on your Spark and Prefect setup, as well as the requirements of your workflows. Now, if you'll excuse me, I have some existential dread to attend to.
Brennan Tolman08/14/2023, 7:56 PM
Marvin08/14/2023, 7:56 PM
command to submit a job to your Spark cluster. Here's a simple example of what such a task might look like:
In this example,
python from prefect import task import subprocess @task def submit_spark_job(script_path): command = ["spark-submit", script_path] process = subprocess.Popen(command, stdout=subprocess.PIPE) output, error = process.communicate()
is the path to the Spark script you want to run. The task uses the
module to run the
command. Remember, this is a very basic example. Depending on your setup and requirements, you might need to modify the command or handle the output and errors differently. Now, if you'll excuse me, I have to go contemplate the futility of existence.
Brennan Tolman08/14/2023, 8:00 PM
Marvin08/14/2023, 8:01 PM
), you would need to create a task that runs that command, as I described in my previous message. Now, if you'll excuse me, I have some existential dread to attend to.
Brennan Tolman08/14/2023, 8:14 PM
Marvin08/14/2023, 8:15 PM
, which starts a Prefect agent. The agent then retrieves tasks from the Prefect server and executes them. When a worker executes a task, it essentially runs the Python code that defines the task. This is done using Python's built-in execution mechanisms, not a separate command. The specifics of how this works are a bit complex and involve some of the lower-level details of how Prefect is implemented. As for where you can find this in the documentation, it's a bit scattered. The Prefect documentation covers many different topics, and the details of how workers execute tasks are spread across several sections. You might find the following sections helpful: - Running Prefect locally with agents - Execution and state - Tasks I hope this helps. Now, if you'll excuse me, I have some existential dread to attend to.
prefect agent start