Sbrisny
02/21/2024, 6:16 PMScout
02/21/2024, 6:16 PMrun_id
of the failed job that you want to restart.
2. Create a DagsterInstance: You need an instance of DagsterInstance
to interact with the Dagster system. If you are running this script outside of the Dagster environment, you can create an ephemeral instance or connect to a persistent one.
python
from dagster import DagsterInstance
instance = DagsterInstance.ephemeral() # For ephemeral instance
# OR
instance = DagsterInstance.get() # To connect to a persistent instance
3. Set up ReexecutionOptions: Use the ReexecutionOptions
class to specify how you want to reexecute the job. If you want to restart from the point of failure, you can use the from_failure
method.
python
from dagster import ReexecutionOptions
options = ReexecutionOptions.from_failure(run_id, instance)
4. Execute the job: Use the execute_job
function to trigger the reexecution. You will need to provide the job as a reconstructable target, the instance, and the reexecution options.
python
from dagster import execute_job, reconstructable
# Assuming 'my_failed_job' is the name of the job you want to restart
result = execute_job(
reconstructable(my_failed_job),
instance=instance,
reexecution_options=options
)
Please note that the above code snippets are based on the documentation and assume that you have a job defined as my_failed_job
and that you have the run_id
of the failed job. Adjust the code to fit your specific job and environment.
If you need to trigger this from a completely external system, you might need to set up a service or an API endpoint that can receive a request to restart a job and then run the above code. This could be done using a web framework like Flask or FastAPI, or by using a task queue system like Celery that can trigger the job restart based on external events. Re-execution | Dagster button Resume failed Backfill option button Re executing a job run with dbt assets f... button GraphQL Python Client | Dagster button Thank you for your feedback!Sbrisny
02/21/2024, 6:20 PMScout
02/21/2024, 6:20 PMDagsterInstance.ephemeral()
creates a temporary, in-memory instance of a DagsterInstance that is suitable for ephemeral execution, such as in testing contexts. This instance does not persist any information to disk and is discarded once the Python process exits. It uses in-memory components for things like run and event log storage.
Here's how you can use `DagsterInstance.ephemeral()`:
python
from dagster import DagsterInstance
# Create an ephemeral DagsterInstance
instance = DagsterInstance.ephemeral()
Regarding connection information, since an ephemeral instance is designed to be temporary and in-memory, it does not require connection information for a database or other persistent storage. It is self-contained and does not connect to an external database.
If you need to provide connection information because you want to interact with external systems or resources (like databases, object stores, etc.), you would typically do this through resource configurations in your job definitions, not through the DagsterInstance
itself.
For example, if you have an op that interacts with a database, you would define a resource for the database connection and pass the connection information through the resource configuration when you set up your job:
python
from dagster import job, op, resource, DagsterInstance
# Define a resource for the database connection
@resource(config_schema={"connection_string": str})
def db_resource(context):
# Here you would create a database connection using the provided connection string
return create_db_connection(context.resource_config["connection_string"])
# Define an op that uses the db_resource
@op(required_resource_keys={"db"})
def my_op(context):
db_conn = context.resources.db
# Perform operations using the db_conn
# Define a job that uses the db_resource
@job(resource_defs={"db": db_resource})
def my_job():
my_op()
# Create an ephemeral DagsterInstance
instance = DagsterInstance.ephemeral()
# Execute the job with the resource configuration
result = my_job.execute_in_process(
run_config={
"resources": {
"db": {
"config": {
"connection_string": "your_connection_string_here"
}
}
}
},
instance=instance
)
In this example, the db_resource
is configured with a connection string when the job is executed. The execute_in_process
method allows you to pass run_config
and an instance, which can be an ephemeral instance for testing purposes. Dagster Docs button Cannot start backfills when gRPC server ... button Dagster Docs button Using the Python DagsterGraphQLClient ag... button Thank you for your feedback!Sbrisny
02/21/2024, 6:23 PMScout
02/21/2024, 6:23 PMrunId
of the failed job that you want to restart.
3. Construct the GraphQL Mutation: Create a GraphQL mutation that uses the launchPipelineReexecution
mutation, providing the necessary parameters such as the runId
of the failed run.
4. Send the API Request: Use an HTTP client to send the GraphQL mutation to the Dagster Cloud endpoint, including the API token for authentication.
Here is an example of what the GraphQL mutation might look like:
graphql
mutation($runId: String!) {
launchPipelineReexecution(
executionParams: {
runConfigData: {}
selector: {
pipelineName: "your_pipeline_name"
}
mode: "default"
executionMetadata: {
parentRunId: $runId
rootRunId: $runId
}
}
) {
__typename
... on LaunchRunSuccess {
run {
runId
pipelineName
status
}
}
... on PythonError {
message
stack
}
}
}
You would replace "your_pipeline_name"
with the name of the pipeline you want to re-execute and $runId
with the ID of the failed run.
To send the request, you can use a tool like curl
or a programming language with an HTTP client library. Here's an example using `curl`:
bash
curl -X POST \
-H "Authorization: Bearer YOUR_API_TOKEN" \
-H "Content-Type: application/json" \
--data '{
"query": "mutation($runId: String!) { launchPipelineReexecution(executionParams: { runConfigData: {} selector: { pipelineName: \"your_pipeline_name\" } mode: \"default\" executionMetadata: { parentRunId: $runId rootRunId: $runId } }) { __typename ... on LaunchRunSuccess { run { runId pipelineName status } } ... on PythonError { message stack } } }",
"variables": {
"runId": "your_failed_run_id"
}
}' \
<https://your-dagster-cloud-endpoint/graphql>
Make sure to replace YOUR_API_TOKEN
with your actual API token, your_pipeline_name
with the name of your pipeline, your_failed_run_id
with the ID of the failed run, and <https://your-dagster-cloud-endpoint/graphql>
with the actual endpoint for your Dagster Cloud instance.
Please note that the exact fields and mutation name may vary based on the version of Dagster Cloud you are using, so you should consult the Dagster Cloud GraphQL API documentation for the most accurate anScout
02/21/2024, 6:24 PMSbrisny
02/21/2024, 6:25 PMScout
02/21/2024, 6:25 PM