kedro.runner.ParallelRunner¶
- class kedro.runner.ParallelRunner(max_workers=None, is_async=False)[source]¶
ParallelRunner
is anAbstractRunner
implementation. It can be used to run thePipeline
in parallel groups formed by toposort. Please note that this runner implementation validates dataset using the_validate_catalog
method, which checks if any of the datasets are single process only using the _SINGLE_PROCESS dataset attribute.Methods
create_default_data_set
(ds_name)Factory method for creating the default dataset for the runner.
run
(pipeline, catalog[, hook_manager, ...])Run the
Pipeline
using the datasets provided bycatalog
and save results back to the same objects.run_only_missing
(pipeline, catalog, hook_manager)Run only the missing outputs from the
Pipeline
using the datasets provided bycatalog
, and save results back to the same objects.- __init__(max_workers=None, is_async=False)[source]¶
Instantiates the runner by creating a Manager.
- Parameters
max_workers (
Optional
[int
]) – Number of worker processes to spawn. If not set, calculated automatically based on the pipeline configuration and CPU core count. On windows machines, the max_workers value cannot be larger than 61 and will be set to min(61, max_workers).is_async (
bool
) – If True, the node inputs and outputs are loaded and saved asynchronously with threads. Defaults to False.
- Raises
ValueError – bad parameters passed
- create_default_data_set(ds_name)[source]¶
Factory method for creating the default dataset for the runner.
- Parameters
ds_name (
str
) – Name of the missing dataset.- Return type
_SharedMemoryDataset
- Returns
An instance of
_SharedMemoryDataset
to be used for all unregistered datasets.
- run(pipeline, catalog, hook_manager=None, session_id=None)¶
Run the
Pipeline
using the datasets provided bycatalog
and save results back to the same objects.- Parameters
pipeline – The
Pipeline
to run.catalog – The
DataCatalog
from which to fetch data.hook_manager – The
PluginManager
to activate hooks.session_id – The id of the session.
- Raises
ValueError – Raised when
Pipeline
inputs cannot be satisfied.- Returns
Any node outputs that cannot be processed by the
DataCatalog
. These are returned in a dictionary, where the keys are defined by the node outputs.
- run_only_missing(pipeline, catalog, hook_manager)¶
Run only the missing outputs from the
Pipeline
using the datasets provided bycatalog
, and save results back to the same objects.- Parameters
pipeline – The
Pipeline
to run.catalog – The
DataCatalog
from which to fetch data.hook_manager – The
PluginManager
to activate hooks.
- Raises
ValueError – Raised when
Pipeline
inputs cannot be satisfied.- Returns
Any node outputs that cannot be processed by the
DataCatalog
. These are returned in a dictionary, where the keys are defined by the node outputs.