enable specifying concurrencyPolicy when creating argo workflow

.gitignore

@@ -20,6 +20,7 @@ R/.Rbuildignore
 
 .DS_Store
 .env
+.venv
 node_modules
 main.js.map
 

metaflow/plugins/argo/argo_client.py

@@ -309,7 +309,9 @@ def trigger_workflow_template(self, name, usertype, username, parameters={}):
                 json.loads(e.body)["message"] if e.body is not None else e.reason
             )
 
-    def schedule_workflow_template(self, name, schedule=None, timezone=None):
+    def schedule_workflow_template(
+        self, name, schedule=None, timezone=None, concurrency_policy=None
+    ):
         # Unfortunately, Kubernetes client does not handle optimistic
         # concurrency control by itself unlike kubectl
         client = self._client.get()
@@ -321,6 +323,7 @@ def schedule_workflow_template(self, name, schedule=None, timezone=None):
                 "suspend": schedule is None,
                 "schedule": schedule,
                 "timezone": timezone,
+                "concurrencyPolicy": concurrency_policy,
                 "failedJobsHistoryLimit": 10000,  # default is unfortunately 1
                 "successfulJobsHistoryLimit": 10000,  # default is unfortunately 3
                 "workflowSpec": {"workflowTemplateRef": {"name": name}},

metaflow/plugins/argo/argo_workflows.py

@@ -175,7 +175,7 @@ def __init__(
         self.parameters = self._process_parameters()
         self.config_parameters = self._process_config_parameters()
         self.triggers, self.trigger_options = self._process_triggers()
-        self._schedule, self._timezone = self._get_schedule()
+        self._schedule, self._timezone, self._concurrency_policy = self._get_schedule()
 
         self._base_labels = self._base_kubernetes_labels()
         self._base_annotations = self._base_kubernetes_annotations()
@@ -386,14 +386,18 @@ def _get_schedule(self):
         if schedule:
             # Remove the field "Year" if it exists
             schedule = schedule[0]
-            return " ".join(schedule.schedule.split()[:5]), schedule.timezone
-        return None, None
+            return (
+                " ".join(schedule.schedule.split()[:5]),
+                schedule.timezone,
+                schedule.concurrency_policy,
+            )
+        return None, None, None
 
     def schedule(self):
         try:
             argo_client = ArgoClient(namespace=KUBERNETES_NAMESPACE)
             argo_client.schedule_workflow_template(
-                self.name, self._schedule, self._timezone
+                self.name, self._schedule, self._timezone, self._concurrency_policy
             )
             # Register sensor.
             # Metaflow will overwrite any existing sensor.
@@ -735,7 +739,13 @@ def _compile_workflow_template(self):
             # hence configuring it to an empty string
             if self._timezone is None:
                 self._timezone = ""
-            cron_info = {"schedule": self._schedule, "tz": self._timezone}
+            if self._concurrency_policy is None:
+                self._concurrency_policy = ""
+            cron_info = {
+                "schedule": self._schedule,
+                "tz": self._timezone,
+                "concurrency_policy": self._concurrency_policy,
+            }
             annotations.update({"metaflow/cron": json.dumps(cron_info)})
 
         if self.parameters:

metaflow/plugins/aws/step_functions/schedule_decorator.py

@@ -30,6 +30,7 @@ class ScheduleDecorator(FlowDecorator):
         "daily": True,
         "hourly": False,
         "timezone": None,
+        "concurrency_policy": None,
     }
 
     def flow_init(
@@ -50,3 +51,4 @@ def flow_init(
 
         # Argo Workflows supports the IANA timezone standard, e.g. America/Los_Angeles
         self.timezone = self.attributes["timezone"]
+        self.concurrency_policy = self.attributes["concurrency_policy"]