diff --git a/python/ray/scripts/scripts.py b/python/ray/scripts/scripts.py
index 606183053..5b6e69bcf 100644
--- a/python/ray/scripts/scripts.py
+++ b/python/ray/scripts/scripts.py
@@ -1034,6 +1034,14 @@ def rsync_up(cluster_config_file, source, target, cluster_name, all_nodes,
     """Upload specific files to a Ray cluster."""
     cli_logger.configure(log_style, log_color, verbose)
 
+    if all_nodes:
+        cli_logger.warning(
+            "WARNING: the `all_nodes` option is deprecated and will be "
+            "removed in the future. "
+            "Rsync to worker nodes is not reliable since workers may be "
+            "added during autoscaling. Please use the `file_mounts` "
+            "feature instead for consistent file sync in autoscaling clusters")
+
     rsync(
         cluster_config_file,
         source,