create threadpool to execture ETL across all CPUs

data/data-pipeline/data_pipeline/etl/runner.py

@@ -1,4 +1,5 @@
 import importlib
+import concurrent.futures
 
 from data_pipeline.etl.score.etl_score import ScoreETL
 from data_pipeline.etl.score.etl_score_geo import GeoScoreETL
@@ -32,6 +33,40 @@ def get_datasets_to_run(dataset_to_run: str):
     return dataset_list
 
 
+def build_instance_class_from_dataset(dataset: str = None) -> None:
+    """Runs a specific dataset
+
+    Args:
+        dataset (str): A specific dataset eligible for a specific ETL process.
+
+    Returns:
+        None
+    """
+    etl_module = importlib.import_module(
+        f"data_pipeline.etl.sources.{dataset['module_dir']}.etl"
+    )
+    etl_class = getattr(etl_module, dataset["class_name"])
+    etl_instance = etl_class()
+
+    etl_module = importlib.import_module(
+        f"data_pipeline.etl.sources.{dataset['module_dir']}.etl"
+    )
+    etl_class = getattr(etl_module, dataset["class_name"])
+    etl_instance = etl_class()
+
+    # run extract
+    etl_instance.extract()
+
+    # run transform
+    etl_instance.transform()
+
+    # run load
+    etl_instance.load()
+
+    # cleanup
+    etl_instance.cleanup()
+
+
 def etl_runner(dataset_to_run: str = None) -> None:
     """Runs all etl processes or a specific one
 
@@ -43,25 +78,23 @@ def etl_runner(dataset_to_run: str = None) -> None:
     """
     dataset_list = get_datasets_to_run(dataset_to_run)
 
-    # Run the ETLs for the dataset_list
-    for dataset in dataset_list:
-        etl_module = importlib.import_module(
-            f"data_pipeline.etl.sources.{dataset['module_dir']}.etl"
-        )
-        etl_class = getattr(etl_module, dataset["class_name"])
-        etl_instance = etl_class()
+    # Create a pool of processes. By default, one is created for each CPU in your machine.
+    with concurrent.futures.ProcessPoolExecutor() as executor:
+        # Get a list of files to process
+        build_processing_classes = [
+            build_instance_class_from_dataset(dataset)
+            for dataset in dataset_list
+        ]
 
-        # run extract
-        etl_instance.extract()
-
-        # run transform
-        etl_instance.transform()
-
-        # run load
-        etl_instance.load()
-
-        # cleanup
-        etl_instance.cleanup()
+        # Process the list of ETL datasets, but split the work across the
+        # process pool to use all CPUs
+        for dataset, _ in zip(
+            build_processing_classes,
+            executor.map(
+                build_instance_class_from_dataset, build_processing_classes
+            ),
+        ):
+            print(f"Completed ETL for {dataset}")
 
     # update the front end JSON/CSV of list of data sources
     pass