From 0d95a9c1ff14773b722009a6c6fd6ad66c7ce395 Mon Sep 17 00:00:00 2001
From: Shuwen Wang <47200617+alphabetc1@users.noreply.github.com>
Date: Mon, 14 Sep 2026 13:12:28 +0800
Subject: [PATCH] [HiCache] Keep the file backend temp file name within
 NAME_MAX (#38925)

---
 python/sglang/srt/mem_cache/hicache_storage.py | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/python/sglang/srt/mem_cache/hicache_storage.py b/python/sglang/srt/mem_cache/hicache_storage.py
index b573e69f1..f469daac8 100644
--- a/python/sglang/srt/mem_cache/hicache_storage.py
+++ b/python/sglang/srt/mem_cache/hicache_storage.py
@@ -533,10 +533,7 @@ class HiCacheFile(HiCacheStorage):
                 return False
             reserved = True
 
-            tmp_path = (
-                f"{tensor_path}.tmp."
-                f"{os.getpid()}.{threading.get_ident()}.{uuid.uuid4().hex}"
-            )
+            tmp_path = os.path.join(self.file_path, f".{uuid.uuid4().hex}.tmp")
             value.contiguous().view(dtype=torch.uint8).numpy().tofile(tmp_path)
             os.replace(tmp_path, tensor_path)
             self._evictor.commit(suffixed)