From cb03fee32b5c191b3ac5a248e47cd58a66c75591 Mon Sep 17 00:00:00 2001
From: tomeras91 <57313761+tomeras91@users.noreply.github.com>
Date: Sun, 3 May 2026 23:00:41 +0300
Subject: [PATCH] [Bugfix][Ray] Fix RayExecutorV2 actor name collision with DP
 > 1 (#40398)

Signed-off-by: Tomer Asida <57313761+tomeras91@users.noreply.github.com>
---
 vllm/v1/engine/utils.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/vllm/v1/engine/utils.py b/vllm/v1/engine/utils.py
index 7b0f00d14c..1f0b9bbb19 100644
--- a/vllm/v1/engine/utils.py
+++ b/vllm/v1/engine/utils.py
@@ -403,6 +403,11 @@ class CoreEngineActorManager:
             range(dp_size), local_dp_ranks, placement_groups
         ):
             dp_vllm_config = copy.deepcopy(vllm_config)
+            if dp_size > 1:
+                # Append the DP rank to instance_id so that per-engine
+                # identifiers (e.g. Ray actor names in RayExecutorV2) are
+                # unique across DP replicas.
+                dp_vllm_config.instance_id = f"{dp_vllm_config.instance_id}_dp{index}"
             dp_vllm_config.parallel_config.placement_group = pg
             local_client = index < local_engine_count