def _core_dagster_event_sequence_for_step(step_context):
'''
Execute the step within the step_context argument given the in-memory
events. This function yields a sequence of DagsterEvents, but without
catching any exceptions that have bubbled up during the computation
of the step.
'''
check.inst_param(step_context, 'step_context', SystemStepExecutionContext)
yield DagsterEvent.step_start_event(step_context)
inputs = {}
for input_name, input_value in _input_values_from_intermediates_manager(
step_context).items():
if isinstance(input_value, ObjectStoreOperation):
yield DagsterEvent.object_store_operation(
step_context,
ObjectStoreOperation.serializable(input_value,
value_name=input_name))
inputs[input_name] = input_value.obj
else:
inputs[input_name] = input_value
for input_name, input_value in inputs.items():
for evt in check.generator(
_type_checked_event_sequence_for_input(step_context,
input_name,
input_value)):
yield evt
with time_execution_scope() as timer_result:
user_event_sequence = check.generator(
_user_event_sequence_for_step_compute_fn(step_context, inputs))
# It is important for this loop to be indented within the
# timer block above in order for time to be recorded accurately.
for user_event in check.generator(
_step_output_error_checked_user_event_sequence(
step_context, user_event_sequence)):
if isinstance(user_event, Output):
for evt in _create_step_events_for_output(
step_context, user_event):
yield evt
elif isinstance(user_event, Materialization):
yield DagsterEvent.step_materialization(
step_context, user_event)
elif isinstance(user_event, ExpectationResult):
yield DagsterEvent.step_expectation_result(
step_context, user_event)
else:
check.failed(
'Unexpected event {event}, should have been caught earlier'
.format(event=user_event))
yield DagsterEvent.step_success_event(
step_context, StepSuccessData(duration_ms=timer_result.millis))
def _set_intermediates(step_context, step_output, step_output_handle, output):
res = step_context.intermediates_manager.set_intermediate(
context=step_context,
runtime_type=step_output.runtime_type,
step_output_handle=step_output_handle,
value=output.value,
)
if isinstance(res, ObjectStoreOperation):
yield DagsterEvent.object_store_operation(
step_context, ObjectStoreOperation.serializable(res, value_name=output.output_name)
)
def copy_required_intermediates_for_execution(pipeline_context,
execution_plan):
'''
Uses the intermediates manager to copy intermediates from the previous run that apply to the
current execution plan, and yields the corresponding events
'''
check.inst_param(pipeline_context, 'pipeline_context',
SystemPipelineExecutionContext)
check.inst_param(execution_plan, 'execution_plan', ExecutionPlan)
parent_run_id = pipeline_context.pipeline_run.parent_run_id
if not parent_run_id:
return
parent_run_logs = pipeline_context.instance.all_logs(parent_run_id)
output_handles_for_current_run = output_handles_from_execution_plan(
execution_plan)
output_handles_from_previous_run = output_handles_from_event_logs(
parent_run_logs)
output_handles_to_copy = output_handles_for_current_run.intersection(
output_handles_from_previous_run)
output_handles_to_copy_by_step = defaultdict(list)
for handle in output_handles_to_copy:
output_handles_to_copy_by_step[handle.step_key].append(handle)
intermediates_manager = pipeline_context.intermediates_manager
for step in execution_plan.topological_steps():
step_context = pipeline_context.for_step(step)
for handle in output_handles_to_copy_by_step.get(step.key, []):
if intermediates_manager.has_intermediate(pipeline_context,
handle):
continue
operation = intermediates_manager.copy_intermediate_from_run(
pipeline_context, parent_run_id, handle)
yield DagsterEvent.object_store_operation(
step_context,
ObjectStoreOperation.serializable(
operation, value_name=handle.output_name),
)
def core_dagster_event_sequence_for_step(step_context, prior_attempt_count):
"""
Execute the step within the step_context argument given the in-memory
events. This function yields a sequence of DagsterEvents, but without
catching any exceptions that have bubbled up during the computation
of the step.
"""
check.inst_param(step_context, "step_context", SystemStepExecutionContext)
check.int_param(prior_attempt_count, "prior_attempt_count")
if prior_attempt_count > 0:
yield DagsterEvent.step_restarted_event(step_context,
prior_attempt_count)
else:
yield DagsterEvent.step_start_event(step_context)
inputs = {}
for input_name, input_value in _input_values_from_intermediate_storage(
step_context):
if isinstance(input_value, ObjectStoreOperation):
yield DagsterEvent.object_store_operation(
step_context,
ObjectStoreOperation.serializable(input_value,
value_name=input_name))
inputs[input_name] = input_value.obj
elif isinstance(input_value, MultipleStepOutputsListWrapper):
for op in input_value:
yield DagsterEvent.object_store_operation(
step_context,
ObjectStoreOperation.serializable(op,
value_name=input_name))
inputs[input_name] = [op.obj for op in input_value]
else:
inputs[input_name] = input_value
for input_name, input_value in inputs.items():
for evt in check.generator(
_type_checked_event_sequence_for_input(step_context,
input_name,
input_value)):
yield evt
with time_execution_scope() as timer_result:
user_event_sequence = check.generator(
_user_event_sequence_for_step_compute_fn(step_context, inputs))
# It is important for this loop to be indented within the
# timer block above in order for time to be recorded accurately.
for user_event in check.generator(
_step_output_error_checked_user_event_sequence(
step_context, user_event_sequence)):
if isinstance(user_event, Output):
for evt in _create_step_events_for_output(
step_context, user_event):
yield evt
elif isinstance(user_event,
(AssetMaterialization, Materialization)):
yield DagsterEvent.step_materialization(
step_context, user_event)
elif isinstance(user_event, ExpectationResult):
yield DagsterEvent.step_expectation_result(
step_context, user_event)
else:
check.failed(
"Unexpected event {event}, should have been caught earlier"
.format(event=user_event))
# We only want to log exactly one step success event or failure event if possible,
# so wait to handle any interrupts (that normally log a failure event) until the success
# event has finished
with delay_interrupts():
yield DagsterEvent.step_success_event(
step_context, StepSuccessData(duration_ms=timer_result.millis))
