diff --git a/charon/cache.py b/charon/cache.py
index 652fe8b6..5dd103d4 100644
--- a/charon/cache.py
+++ b/charon/cache.py
@@ -113,6 +113,9 @@ def invalidate_paths(
                     break
             if current_invalidation:
                 results.append(current_invalidation)
+                # To avoid conflict rushing request, we can wait 1s here
+                # for next invalidation request sending.
+                time.sleep(1)
             caller_ref = str(uuid.uuid4())
             logger.debug(
                 "Processing invalidation for batch with ref %s, size: %s",
diff --git a/charon/pkgs/maven.py b/charon/pkgs/maven.py
index c7413c80..f8ba8abc 100644
--- a/charon/pkgs/maven.py
+++ b/charon/pkgs/maven.py
@@ -459,7 +459,7 @@ def handle_maven_uploading(
         else:
             logger.info("Bypass indexing")
 
-        # Finally do the CF invalidating for metadata files
+        # 11. Finally do the CF invalidating for metadata files
         if cf_enable and len(cf_invalidate_paths) > 0:
             cf_client = CFClient(aws_profile=aws_profile)
             cf_invalidate_paths = __wildcard_metadata_paths(cf_invalidate_paths)
@@ -639,6 +639,7 @@ def handle_maven_del(
         else:
             logger.info("Bypassing indexing")
 
+        # 9. Finally do the CF invalidating for metadata files
         if cf_enable and len(cf_invalidate_paths):
             cf_client = CFClient(aws_profile=aws_profile)
             cf_invalidate_paths = __wildcard_metadata_paths(cf_invalidate_paths)