diff --git a/data_juicer/config/config.py b/data_juicer/config/config.py
index 8f91cd330..4e45d8d50 100644
--- a/data_juicer/config/config.py
+++ b/data_juicer/config/config.py
@@ -324,14 +324,14 @@ def init_setup_from_cfg(cfg):
     """
 
     cfg.export_path = os.path.abspath(cfg.export_path)
-    export_path = cfg.export_path
-    cfg.work_dir = os.path.dirname(export_path)
+    cfg.work_dir = os.path.dirname(cfg.export_path)
+    export_rel_path = os.path.relpath(cfg.export_path, start=cfg.work_dir)
     log_dir = os.path.join(cfg.work_dir, 'log')
     if not os.path.exists(log_dir):
         os.makedirs(log_dir, exist_ok=True)
     timestamp = time.strftime('%Y%m%d%H%M%S', time.localtime(time.time()))
     cfg.timestamp = timestamp
-    logfile_name = timestamp + '.txt'
+    logfile_name = f'export_{export_rel_path}_time_{timestamp}.txt'
     setup_logger(save_dir=log_dir,
                  filename=logfile_name,
                  redirect=cfg.executor_type == 'default')
diff --git a/data_juicer/ops/filter/maximum_line_length_filter.py b/data_juicer/ops/filter/maximum_line_length_filter.py
index f5dd2d0d5..dab086a0a 100644
--- a/data_juicer/ops/filter/maximum_line_length_filter.py
+++ b/data_juicer/ops/filter/maximum_line_length_filter.py
@@ -49,7 +49,7 @@ def compute_stats(self, sample, context=False):
                 sample[Fields.context][context_key] = lines
         line_lengths = list(map(len, lines))
         sample[Fields.stats][StatsKeys.max_line_length] = max(
-            line_lengths) if line_lengths else 0.0
+            line_lengths) if line_lengths else 0
         return sample
 
     def process(self, sample):