[HiCache] Key storage prefetch by the request namespace (#36382)

test/registered/unit/mem_cache/test_unified_radix_cache_unittest.py

@@ -2708,6 +2708,8 @@ class UnifiedRadixCacheSuite:
             prefix_len = f.matched_len
         req = mock.Mock()
         req.rid = req_id
+        req.extra_key = None
+        req.cache_salt = None
         if prefix_indices is not None:
             # Spliceable mid-anchor consumption publishes value=cat(prefix,
             # fill) — the real device prefix is required (zeros would insert
@@ -3342,6 +3344,8 @@ class UnifiedRadixCacheSuite:
         held = cons.buffer_pipeline.staged_prefetches[req_id]
         req = mock.Mock()
         req.rid = req_id
+        req.extra_key = None
+        req.cache_salt = None
         req.last_node = cons.root_node_handle()
         req.prefix_indices = torch.zeros(
             held.matched_len,
@@ -3561,6 +3565,8 @@ class UnifiedRadixCacheSuite:
         held = cons.buffer_pipeline.staged_prefetches[req_id]
         req = mock.Mock()
         req.rid = req_id
+        req.extra_key = None
+        req.cache_salt = None
         req.last_node = cons.root_node_handle()
         req.prefix_indices = torch.zeros(
             held.matched_len,
@@ -3763,6 +3769,8 @@ class UnifiedRadixCacheSuite:
         f = cons.buffer_pipeline.staged_prefetches[req_id]
         req = mock.Mock()
         req.rid = req_id
+        req.extra_key = None
+        req.cache_salt = None
         req.prefix_indices = torch.zeros(
             0,
             dtype=torch.int64,