refine cache code

Former-commit-id: 897cfc2ee63bc4a941fe122ef98ae7dd853a9e4e

cpp/src/cache/Cache.inl

@@ -56,11 +56,11 @@ void Cache<ItemObj>::insert(const std::string& key, const ItemObj& item) {
         return;
     }
 
-    if(item->size() > capacity_) {
-        SERVER_LOG_ERROR << "Item size " << item->size()
-                        << " is too large to insert into cache, capacity " << capacity_;
-        return;
-    }
+//    if(item->size() > capacity_) {
+//        SERVER_LOG_ERROR << "Item size " << item->size()
+//                        << " is too large to insert into cache, capacity " << capacity_;
+//        return;
+//    }
 
     //calculate usage
     {

cpp/unittest/server/cache_test.cpp

@@ -162,7 +162,7 @@ TEST(CacheTest, CPU_CACHE_TEST) {
         engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 6000000);
         cache::DataObjPtr data_obj = std::make_shared<cache::DataObj>(mock_index);
         cpu_mgr->InsertItem("index_6g", data_obj);
-        ASSERT_FALSE(cpu_mgr->ItemExists("index_6g"));//data greater than capacity can not be inserted sucessfully
+        ASSERT_TRUE(cpu_mgr->ItemExists("index_6g"));
     }
 
     cpu_mgr->PrintInfo();