Linton Ye
02/18/2024, 4:01 PMScout
02/18/2024, 4:01 PMteardown_after_execution
lifecycle hook provided by the resource definition. According to the documentation, once a resource is no longer needed at the end of a run, the teardown_after_execution
method is called. This method is passed the same context object as setup_for_execution
and can be used for cleaning up any state that was initialized in setup_for_execution
. Here's a brief overview of how you can implement this: 1. Define your resource class and include the teardown_after_execution
method. 2. In the teardown_after_execution
method, implement the logic to release or clean up the resource. 3. Ensure that your resource is configured correctly in your pipeline/job so that it is used during the run. The teardown_after_execution
method will be called once per run, per process. This means that if you are using the in-process executor, it will be called once per run. If you are using the multiprocess executor, each process's instance of the resource will have its teardown_after_execution
method called. Here is an example from the documentation that illustrates how to set up a resource with lifecycle hooks: python from dagster import resource, InitResourceContext class MyResource: def __init__(self, init_context: InitResourceContext): # Initialization logic here pass def setup_for_execution(self, init_context: InitResourceContext): # Setup logic here pass def teardown_after_execution(self, context: InitResourceContext): # Cleanup logic here pass # Usage in a pipeline/job @resource def my_resource(init_context: InitResourceContext): resource_instance = MyResource(init_context) resource_instance.setup_for_execution(init_context) try: yield resource_instance finally: resource_instance.teardown_after_execution(init_context)
In this example, my_resource
is a resource definition that yields an instance of MyResource
. The setup_for_execution
method is called to set up any necessary state, and the teardown_after_execution
method is responsible for cleaning up the state after the run is completed.Linton Ye
02/18/2024, 5:00 PMScout
02/18/2024, 5:00 PMdagster.yaml
file, the most direct way to switch executors for a specific pipeline/job is to include the appropriate configuration when you launch a run. Here's how you can specify the in-process executor using the configuration: yaml execution: in_process: {}
You can include this configuration snippet in your run configuration file or directly in the Dagit UI when you launch a run. If you're using the Python API to execute a job, you can pass this configuration as a Python dictionary to the execute_in_process
method or when you build the run config programmatically. For example, if you're using the Python API, you could do something like this: python result = my_pipeline.execute_in_process( run_config={ "execution": { "in_process": {} } } )
If you want to set the in-process executor as the default for all runs, you can update your dagster.yaml
with the following configuration: yaml execution: default: config: in_process: {}
This configuration in the dagster.yaml
file sets the in-process executor as the default execution mode for all pipelines/jobs in the instance. However, please note that this will apply to all pipelines/jobs unless overridden by a specific run configuration.Linton Ye
02/18/2024, 5:02 PMScout
02/18/2024, 5:02 PMdagster.yaml
file does not inherently mean that all runs will be executed sequentially. The in-process executor means that the execution of a pipeline/job will happen within the same process as the one that launched the run. This is in contrast to executors that may run each step in a separate process or even on different machines, such as the multiprocess or celery executors. However, the in-process executor does not manage the concurrency of multiple pipeline/job runs. The concurrency of runs is managed by the run coordinator and the run launcher configured in your Dagster instance. If you want to ensure that runs are executed sequentially, you would need to configure the run coordinator to enforce that behavior. By default, without additional concurrency limits or prioritization rules, runs are executed in the order they are submitted to the queue. If you want to enforce that only one run can execute at a time, you would need to set up appropriate concurrency limits in your Dagster instance configuration. For example, you could set a global concurrency limit in your dagster.yaml
to ensure that only one run can execute at a time: yaml run_coordinator: module: dagster.core.run_coordinator class: QueuedRunCoordinator config: max_concurrent_runs: 1
This configuration would ensure that only one run is executed at a time, regardless of the executor used. If a run is in progress, subsequent runs will be queued until the current run is completed.Linton Ye
02/18/2024, 5:04 PMScout
02/18/2024, 5:04 PMdagster.yaml
file like this: yaml execution: default: config: in_process: {}
With this configuration, each run will be executed in its own process, but all steps within that run will execute in the same process as the run itself. This allows for shared memory and resources within a run, which can be beneficial for certain workloads. Please note that the concurrency of runs (i.e., whether multiple runs can execute simultaneously) is still managed by the run coordinator and run launcher. The in-process executor configuration only affects how the steps within a run are executed relative to each other. If you have not set any concurrency limits, Dagster will execute runs concurrently as long as resources are available and according to the rules of the run coordinator and launcher you have configured.Linton Ye
02/18/2024, 5:13 PMScout
02/18/2024, 5:13 PMexecution
key to see if it specifies the in-process executor: yaml execution: in_process: {}
2. Dagster API: If you have access to the Dagster Python API, you can programmatically retrieve the run configuration for a specific run using the DagsterInstance
object. Here's an example of how you might do that: python from dagster import DagsterInstance # Assuming you have the run_id for the run you want to check run_id = "example_run_id" instance = DagsterInstance.get() run = instance.get_run_by_id(run_id) if run: run_config = run.run_config # Check if the execution config specifies in_process if run_config.get("execution", {}).get("in_process") is not None: print("The run is configured to use the in-process executor.") else: print("The run is not configured to use the in-process executor.")
3. Run Logs: If you have access to the logs for the run, either through Dagit or through your logging system, you can look for log entries that indicate which executor was used. The logs might include information about the executor configuration at the start of the run. 4. Run Storage: If you are storing run configurations in a database or file system, you can directly inspect the stored configuration for the run in question. Remember that if no executor is specified in the run configuration, Dagster will use the default executor specified in the dagster.yaml
file or the default in-process executor if no default is set.