add sleep after initialize external execution

Author: SYangster

nvflare/app_common/executors/client_api_launcher_executor.py

@@ -30,6 +30,7 @@ def __init__(
         launch_timeout: Optional[float] = None,
         task_wait_timeout: Optional[float] = None,
         last_result_transfer_timeout: float = 300.0,
+        external_execution_wait: float = 5.0,
         peer_read_timeout: Optional[float] = None,
         monitor_interval: float = 0.01,
         read_interval: float = 0.001,
@@ -81,6 +82,7 @@ def __init__(
             launch_timeout=launch_timeout,
             task_wait_timeout=task_wait_timeout,
             last_result_transfer_timeout=last_result_transfer_timeout,
+            external_execution_wait=external_execution_wait,
             peer_read_timeout=peer_read_timeout,
             monitor_interval=monitor_interval,
             read_interval=read_interval,

nvflare/app_common/executors/launcher_executor.py

@@ -42,6 +42,7 @@ def __init__(
         launch_timeout: Optional[float] = None,
         task_wait_timeout: Optional[float] = None,
         last_result_transfer_timeout: float = 300.0,
+        external_execution_wait: float = 5.0,
         peer_read_timeout: Optional[float] = None,
         monitor_interval: float = 1.0,
         read_interval: float = 0.1,
@@ -95,6 +96,7 @@ def __init__(
         self._launcher_finish = False
         self._launcher_finish_time = None
         self._last_result_transfer_timeout = last_result_transfer_timeout
+        self._external_execution_wait = external_execution_wait
         self._received_result = Event()
         self._job_end = False
 
@@ -245,6 +247,7 @@ def _initialize_external_execution(
             self.log_error(fl_ctx, "External execution set up failed.")
             abort_signal.trigger("External execution set up failed.")
             return False
+        time.sleep(self._external_execution_wait)
         return True
 
     def _execute_launcher_method_in_thread_executor(self, method_name: str, **kwargs) -> Any: