| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| #include "kudu/cfile/block_cache.h" |
| |
| #include <cstring> |
| #include <memory> |
| #include <ostream> |
| |
| #include <gflags/gflags_declare.h> |
| #include <glog/logging.h> |
| #include <gtest/gtest.h> |
| |
| #include "kudu/util/cache.h" |
| #include "kudu/util/mem_tracker.h" |
| #include "kudu/util/slice.h" |
| |
| DECLARE_double(cache_memtracker_approximation_ratio); |
| |
| namespace kudu { |
| namespace cfile { |
| |
| static const char *DATA_TO_CACHE = "hello world"; |
| |
| TEST(TestBlockCache, TestBasics) { |
| // Disable approximate tracking of cache memory since we make specific |
| // assertions on the MemTracker in this test. |
| FLAGS_cache_memtracker_approximation_ratio = 0; |
| |
| size_t data_size = strlen(DATA_TO_CACHE) + 1; |
| BlockCache cache(512 * 1024 * 1024); |
| BlockCache::FileId id(1234); |
| BlockCache::CacheKey key(id, 1); |
| |
| std::shared_ptr<MemTracker> mem_tracker; |
| if (BlockCache::GetConfiguredCacheMemoryTypeOrDie() == Cache::MemoryType::DRAM) { |
| ASSERT_TRUE(MemTracker::FindTracker("block_cache-sharded_lru_cache", &mem_tracker)); |
| } |
| |
| // Lookup something missing from cache |
| { |
| BlockCacheHandle handle; |
| ASSERT_FALSE(cache.Lookup(key, Cache::EXPECT_IN_CACHE, &handle)); |
| ASSERT_FALSE(handle.valid()); |
| } |
| |
| BlockCache::PendingEntry data = cache.Allocate(key, data_size); |
| memcpy(data.val_ptr(), DATA_TO_CACHE, data_size); |
| |
| // Insert and re-lookup |
| BlockCacheHandle inserted_handle; |
| cache.Insert(&data, &inserted_handle); |
| ASSERT_FALSE(data.valid()); |
| ASSERT_TRUE(inserted_handle.valid()); |
| |
| if (mem_tracker) { |
| int overhead = mem_tracker->consumption() - data_size; |
| EXPECT_GT(overhead, 0); |
| LOG(INFO) << "Cache overhead for one entry: " << overhead; |
| } |
| |
| BlockCacheHandle retrieved_handle; |
| ASSERT_TRUE(cache.Lookup(key, Cache::EXPECT_IN_CACHE, &retrieved_handle)); |
| ASSERT_TRUE(retrieved_handle.valid()); |
| |
| ASSERT_EQ(0, memcmp(retrieved_handle.data().data(), DATA_TO_CACHE, data_size)); |
| |
| // Ensure that a lookup for a different offset doesn't |
| // return this data. |
| BlockCache::CacheKey key1(id, 3); |
| ASSERT_FALSE(cache.Lookup(key1, Cache::EXPECT_IN_CACHE, &retrieved_handle)); |
| } |
| |
| |
| } // namespace cfile |
| } // namespace kudu |