bug fix

python/paddle/fluid/io.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import os
+import errno
 import time
 import shutil
 
@@ -881,11 +882,9 @@ def save_checkpoint(executor,
     if trainer_args:
         assert isinstance(trainer_args, dict)
 
-    if not os.path.isdir(checkpoint_dir):
-        os.makedirs(checkpoint_dir)
-
     is_chief = trainer_id == 0
 
+    _make_chekcpoint_dirs(checkpoint_dir)
     serial = get_latest_checkpoint_serial(checkpoint_dir) + 1
     cur_dir = _get_serial_dir(checkpoint_dir, serial)
 
@@ -1251,6 +1250,20 @@ def _is_checkpoint_var(var):
     return var.persistable
 
 
+def _make_chekcpoint_dirs(dirs):
+    assert dirs is not None
+
+    if os.path.isfile(dirs):
+        raise OSError(errno.ENOTDIR, "dirs path shoule be a Directory.", dirs)
+
+    if not os.path.isdir(dirs):
+        try:
+            os.makedirs(dirs)
+        except OSError as err:
+            if err.errno != errno.EEXIST:
+                raise err
+
+
 def _get_dir_serial(dirname):
     _, serial = dirname.split(CHECKPOINT_SEPARATOR)
 
@@ -1264,38 +1277,27 @@ def _get_dir_serial(dirname):
 def _get_serial_dir(dirname, serial):
     serial_folder = CHECKPOINT_PREFIX + CHECKPOINT_SEPARATOR + str(serial)
     serial_dir = os.path.join(dirname, serial_folder)
-
-    if not os.path.isdir(serial_dir):
-        os.makedirs(serial_dir)
+    _make_chekcpoint_dirs(serial_dir)
 
     return serial_dir
 
 
 def _get_model_dir(dirname):
     model_dir = os.path.join(dirname, MODEL_DIR)
-
-    if not os.path.isdir(model_dir):
-        os.makedirs(model_dir)
-
+    _make_chekcpoint_dirs(model_dir)
     return model_dir
 
 
 def _get_lookuptable_dir(dirname):
     lookuptable_dir = os.path.join(dirname, LOOKUP_TABLE_DIR)
-
-    if not os.path.isdir(lookuptable_dir):
-        os.makedirs(lookuptable_dir)
-
+    _make_chekcpoint_dirs(lookuptable_dir)
     return lookuptable_dir
 
 
 def _get_trainer_dir(dirname, trainer_id):
     trainer_folder = TRAINER_PREFIX + CHECKPOINT_SEPARATOR + str(trainer_id)
     trainer_dir = os.path.join(dirname, trainer_folder)
-
-    if not os.path.isdir(trainer_dir):
-        os.makedirs(trainer_dir)
-
+    _make_chekcpoint_dirs(trainer_dir)
     return trainer_dir
 
 
@@ -1314,7 +1316,11 @@ def _scroll_delete(dirname, max_num_checkpoints=3):
     serials = serials[max_num_checkpoints:]
     for serial in serials:
         cur_dir = _get_serial_dir(dirname, serial)
+        try:
             shutil.rmtree(cur_dir)
+        except OSError as err:
+            if err.errno != errno.ENOENT:
+                raise err
 
 
 def _write_success(dirname):