From a5c7e9d236fc85b57807f7d7370a8a262fe8b9c2 Mon Sep 17 00:00:00 2001
From: huangtingwei <141888744+huangtingwei9988@users.noreply.github.com>
Date: Thu, 4 Jun 2026 18:01:21 +0800
Subject: [PATCH] [HiCache] fix PD L3 cache hit details from decode responses
 (#27046)

---
 .../srt/managers/scheduler_components/output_streamer.py    | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/python/sglang/srt/managers/scheduler_components/output_streamer.py b/python/sglang/srt/managers/scheduler_components/output_streamer.py
index 4bbde9887..cac807158 100644
--- a/python/sglang/srt/managers/scheduler_components/output_streamer.py
+++ b/python/sglang/srt/managers/scheduler_components/output_streamer.py
@@ -74,9 +74,11 @@ class SchedulerOutputStreamer:
                 "device": req.cached_tokens_device,
                 "host": req.cached_tokens_host,
             }
-            # Only include storage fields if L3 storage is enabled
-            if self.enable_hicache_storage():
+            # In PD mode the L3 hit is produced on prefill and reported on
+            # decode via metadata, while decode may not have a local storage backend.
+            if req.cached_tokens_storage > 0 or self.enable_hicache_storage():
                 details["storage"] = req.cached_tokens_storage
+            if self.enable_hicache_storage():
                 details["storage_backend"] = self._get_storage_backend_type()
             return details