bugfix, make sure dfs dir is created

agent.py

@@ -303,13 +303,17 @@ class MyHandler(BaseHTTPRequestHandler):
 				while True:
 					failed_cnt += 1
 					if failed_cnt > 3:
+						print("[ERROR] unable to create dfs dir %s" % dfs_src)
 						break
 					try:
 						# Docker wouldn't create dir by default on bind mode,
 						# see https://github.com/moby/moby/issues/13121
 						path = Path(dfs_src)
 						path.mkdir(parents=True, exist_ok=True)
-						break
+						if path.exists():
+							break
+						else:
+							time.sleep(1)
 					except OSError as e:
 						print("Creation of the directory %s failed" % dfs_src)
 						print(e)