diff --git a/deepdoc/parser/mineru_parser.py b/deepdoc/parser/mineru_parser.py
index f22c6e48b..aba237dd1 100644
--- a/deepdoc/parser/mineru_parser.py
+++ b/deepdoc/parser/mineru_parser.py
@@ -511,7 +511,7 @@ class MinerUParser(RAGFlowPdfParser):
         for output in outputs:
             match output["type"]:
                 case MinerUContentType.TEXT:
-                    section = output["text"]
+                    section = output.get("text", "")
                 case MinerUContentType.TABLE:
                     section = output.get("table_body", "") + "\n".join(output.get("table_caption", [])) + "\n".join(
                         output.get("table_footnote", []))
@@ -521,13 +521,13 @@ class MinerUParser(RAGFlowPdfParser):
                     section = "".join(output.get("image_caption", [])) + "\n" + "".join(
                         output.get("image_footnote", []))
                 case MinerUContentType.EQUATION:
-                    section = output["text"]
+                    section = output.get("text", "")
                 case MinerUContentType.CODE:
-                    section = output["code_body"] + "\n".join(output.get("code_caption", []))
+                    section = output.get("code_body", "") + "\n".join(output.get("code_caption", []))
                 case MinerUContentType.LIST:
                     section = "\n".join(output.get("list_items", []))
                 case MinerUContentType.DISCARDED:
-                    pass
+                    continue  # Skip discarded blocks entirely
 
             if section and parse_method == "manual":
                 sections.append((section, output["type"], self._line_tag(output)))
diff --git a/rag/app/naive.py b/rag/app/naive.py
index 7756f7a9a..1046a8f62 100644
--- a/rag/app/naive.py
+++ b/rag/app/naive.py
@@ -651,7 +651,7 @@ def chunk(filename, binary=None, from_page=0, to_page=100000, lang="Chinese", ca
         "parser_config", {
             "chunk_token_num": 512, "delimiter": "\n!?。；！？", "layout_recognize": "DeepDOC", "analyze_hyperlink": True})
 
-    child_deli = parser_config.get("children_delimiter", "").encode('utf-8').decode('unicode_escape').encode('latin1').decode('utf-8')
+    child_deli = (parser_config.get("children_delimiter") or "").encode('utf-8').decode('unicode_escape').encode('latin1').decode('utf-8')
     cust_child_deli = re.findall(r"`([^`]+)`", child_deli)
     child_deli = "|".join(re.sub(r"`([^`]+)`", "", child_deli))
     if cust_child_deli:
diff --git a/rag/svr/task_executor.py b/rag/svr/task_executor.py
index 8668d9178..37c6f5aec 100644
--- a/rag/svr/task_executor.py
+++ b/rag/svr/task_executor.py
@@ -1165,6 +1165,19 @@ async def task_manager():
 
 
 async def main():
+    # Stagger executor startup to prevent connection storm to Infinity
+    # Extract worker number from CONSUMER_NAME (e.g., "task_executor_abc123_5" -> 5)
+    try:
+        worker_num = int(CONSUMER_NAME.rsplit("_", 1)[-1])
+        # Add random delay: base delay + worker_num * 2.0s + random jitter
+        # This spreads out connection attempts over several seconds
+        startup_delay = worker_num * 2.0 + random.uniform(0, 0.5)
+        if startup_delay > 0:
+            logging.info(f"Staggering startup by {startup_delay:.2f}s to prevent connection storm")
+            await asyncio.sleep(startup_delay)
+    except (ValueError, IndexError):
+        pass  # Non-standard consumer name, skip delay
+
     logging.info(r"""
     ____                      __  _
    /  _/___  ____ ____  _____/ /_(_)___  ____     ________  ______   _____  _____
diff --git a/rag/utils/infinity_conn.py b/rag/utils/infinity_conn.py
index 1ac2f7b33..1a0edd418 100644
--- a/rag/utils/infinity_conn.py
+++ b/rag/utils/infinity_conn.py
@@ -183,7 +183,7 @@ class InfinityConnection(DocStoreConnection):
         logger.info(f"Use Infinity {infinity_uri} as the doc engine.")
         for _ in range(24):
             try:
-                connPool = ConnectionPool(infinity_uri, max_size=32)
+                connPool = ConnectionPool(infinity_uri, max_size=4)
                 inf_conn = connPool.get_conn()
                 res = inf_conn.show_current_node()
                 if res.error_code == ErrorCode.OK and res.server_status in ["started", "alive"]: