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rocksdb/table/cuckoo_table_reader_test.cc

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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#ifndef GFLAGS
#include <cstdio>
int main() {
fprintf(stderr, "Please install gflags to run this test\n");
return 1;
}
#else
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#include <gflags/gflags.h>
#include <vector>
#include <string>
#include <map>
#include "table/meta_blocks.h"
#include "table/cuckoo_table_builder.h"
#include "table/cuckoo_table_reader.h"
#include "table/cuckoo_table_factory.h"
#include "util/arena.h"
#include "util/random.h"
#include "util/testharness.h"
#include "util/testutil.h"
using GFLAGS::ParseCommandLineFlags;
using GFLAGS::SetUsageMessage;
DEFINE_string(file_dir, "", "Directory where the files will be created"
" for benchmark. Added for using tmpfs.");
DEFINE_bool(enable_perf, false, "Run Benchmark Tests too.");
namespace rocksdb {
extern const uint64_t kCuckooTableMagicNumber;
namespace {
const uint32_t kNumHashFunc = 10;
// Methods, variables related to Hash functions.
std::unordered_map<std::string, std::vector<uint64_t>> hash_map;
void AddHashLookups(const std::string& s, uint64_t bucket_id,
uint32_t num_hash_fun) {
std::vector<uint64_t> v;
for (uint32_t i = 0; i < num_hash_fun; i++) {
v.push_back(bucket_id + i);
}
hash_map[s] = v;
}
uint64_t GetSliceHash(const Slice& s, uint32_t index,
uint64_t max_num_buckets) {
return hash_map[s.ToString()][index];
}
// Methods, variables for checking key and values read.
struct ValuesToAssert {
ValuesToAssert(const std::string& key, const Slice& value)
: expected_user_key(key),
expected_value(value),
call_count(0) {}
std::string expected_user_key;
Slice expected_value;
int call_count;
};
bool AssertValues(void* assert_obj,
const ParsedInternalKey& k, const Slice& v) {
ValuesToAssert *ptr = reinterpret_cast<ValuesToAssert*>(assert_obj);
ASSERT_EQ(ptr->expected_value.ToString(), v.ToString());
ASSERT_EQ(ptr->expected_user_key, k.user_key.ToString());
++ptr->call_count;
return false;
}
} // namespace
class CuckooReaderTest {
public:
CuckooReaderTest() {
options.allow_mmap_reads = true;
env = options.env;
env_options = EnvOptions(options);
}
void SetUp(int num_items) {
this->num_items = num_items;
hash_map.clear();
keys.clear();
keys.resize(num_items);
user_keys.clear();
user_keys.resize(num_items);
values.clear();
values.resize(num_items);
}
std::string NumToStr(int64_t i) {
return std::string(reinterpret_cast<char*>(&i), sizeof(i));
}
void CreateCuckooFileAndCheckReader() {
unique_ptr<WritableFile> writable_file;
ASSERT_OK(env->NewWritableFile(fname, &writable_file, env_options));
CuckooTableBuilder builder(
writable_file.get(), 0.9, kNumHashFunc, 100, GetSliceHash);
ASSERT_OK(builder.status());
for (uint32_t key_idx = 0; key_idx < num_items; ++key_idx) {
builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
ASSERT_OK(builder.status());
ASSERT_EQ(builder.NumEntries(), key_idx + 1);
}
ASSERT_OK(builder.Finish());
ASSERT_EQ(num_items, builder.NumEntries());
file_size = builder.FileSize();
ASSERT_OK(writable_file->Close());
// Check reader now.
unique_ptr<RandomAccessFile> read_file;
ASSERT_OK(env->NewRandomAccessFile(fname, &read_file, env_options));
CuckooTableReader reader(
options,
std::move(read_file),
file_size,
GetSliceHash);
ASSERT_OK(reader.status());
for (uint32_t i = 0; i < num_items; ++i) {
ValuesToAssert v(user_keys[i], values[i]);
ASSERT_OK(reader.Get(
ReadOptions(), Slice(keys[i]), &v, AssertValues, nullptr));
ASSERT_EQ(1, v.call_count);
}
}
void UpdateKeys(bool with_zero_seqno) {
for (uint32_t i = 0; i < num_items; i++) {
ParsedInternalKey ikey(user_keys[i],
with_zero_seqno ? 0 : i + 1000, kTypeValue);
keys[i].clear();
AppendInternalKey(&keys[i], ikey);
}
}
void CheckIterator() {
unique_ptr<RandomAccessFile> read_file;
ASSERT_OK(env->NewRandomAccessFile(fname, &read_file, env_options));
CuckooTableReader reader(
options,
std::move(read_file),
file_size,
GetSliceHash);
ASSERT_OK(reader.status());
Iterator* it = reader.NewIterator(ReadOptions(), nullptr);
ASSERT_OK(it->status());
ASSERT_TRUE(!it->Valid());
it->SeekToFirst();
int cnt = 0;
while (it->Valid()) {
ASSERT_OK(it->status());
ASSERT_TRUE(Slice(keys[cnt]) == it->key());
ASSERT_TRUE(Slice(values[cnt]) == it->value());
++cnt;
it->Next();
}
ASSERT_EQ(static_cast<uint32_t>(cnt), num_items);
it->SeekToLast();
cnt = num_items - 1;
ASSERT_TRUE(it->Valid());
while (it->Valid()) {
ASSERT_OK(it->status());
ASSERT_TRUE(Slice(keys[cnt]) == it->key());
ASSERT_TRUE(Slice(values[cnt]) == it->value());
--cnt;
it->Prev();
}
ASSERT_EQ(cnt, -1);
cnt = num_items / 2;
it->Seek(keys[cnt]);
while (it->Valid()) {
ASSERT_OK(it->status());
ASSERT_TRUE(Slice(keys[cnt]) == it->key());
ASSERT_TRUE(Slice(values[cnt]) == it->value());
++cnt;
it->Next();
}
ASSERT_EQ(static_cast<uint32_t>(cnt), num_items);
delete it;
Arena arena;
it = reader.NewIterator(ReadOptions(), &arena);
ASSERT_OK(it->status());
ASSERT_TRUE(!it->Valid());
it->Seek(keys[num_items/2]);
ASSERT_TRUE(it->Valid());
ASSERT_OK(it->status());
ASSERT_TRUE(keys[num_items/2] == it->key());
ASSERT_TRUE(values[num_items/2] == it->value());
ASSERT_OK(it->status());
it->~Iterator();
}
std::vector<std::string> keys;
std::vector<std::string> user_keys;
std::vector<std::string> values;
uint64_t num_items;
std::string fname;
uint64_t file_size;
Options options;
Env* env;
EnvOptions env_options;
};
TEST(CuckooReaderTest, WhenKeyExists) {
SetUp(kNumHashFunc);
fname = test::TmpDir() + "/CuckooReader_WhenKeyExists";
for (uint64_t i = 0; i < num_items; i++) {
user_keys[i] = "key" + NumToStr(i);
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
AppendInternalKey(&keys[i], ikey);
values[i] = "value" + NumToStr(i);
// Give disjoint hash values.
AddHashLookups(user_keys[i], i, kNumHashFunc);
}
CreateCuckooFileAndCheckReader();
// Last level file.
UpdateKeys(true);
CreateCuckooFileAndCheckReader();
// Test with collision. Make all hash values collide.
hash_map.clear();
for (uint32_t i = 0; i < num_items; i++) {
AddHashLookups(user_keys[i], 0, kNumHashFunc);
}
UpdateKeys(false);
CreateCuckooFileAndCheckReader();
// Last level file.
UpdateKeys(true);
CreateCuckooFileAndCheckReader();
}
TEST(CuckooReaderTest, CheckIterator) {
SetUp(2*kNumHashFunc);
fname = test::TmpDir() + "/CuckooReader_CheckIterator";
for (uint64_t i = 0; i < num_items; i++) {
user_keys[i] = "key" + NumToStr(i);
ParsedInternalKey ikey(user_keys[i], 0, kTypeValue);
AppendInternalKey(&keys[i], ikey);
values[i] = "value" + NumToStr(i);
// Give disjoint hash values, in reverse order.
AddHashLookups(user_keys[i], num_items-i-1, kNumHashFunc);
}
CreateCuckooFileAndCheckReader();
CheckIterator();
// Last level file.
UpdateKeys(true);
CreateCuckooFileAndCheckReader();
CheckIterator();
}
TEST(CuckooReaderTest, WhenKeyNotFound) {
// Add keys with colliding hash values.
SetUp(kNumHashFunc);
fname = test::TmpDir() + "/CuckooReader_WhenKeyNotFound";
for (uint64_t i = 0; i < num_items; i++) {
user_keys[i] = "key" + NumToStr(i);
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
AppendInternalKey(&keys[i], ikey);
values[i] = "value" + NumToStr(i);
// Make all hash values collide.
AddHashLookups(user_keys[i], 0, kNumHashFunc);
}
CreateCuckooFileAndCheckReader();
unique_ptr<RandomAccessFile> read_file;
ASSERT_OK(env->NewRandomAccessFile(fname, &read_file, env_options));
CuckooTableReader reader(
options,
std::move(read_file),
file_size,
GetSliceHash);
ASSERT_OK(reader.status());
// Search for a key with colliding hash values.
std::string not_found_user_key = "key" + NumToStr(num_items);
std::string not_found_key;
AddHashLookups(not_found_user_key, 0, kNumHashFunc);
ParsedInternalKey ikey(not_found_user_key, 1000, kTypeValue);
AppendInternalKey(&not_found_key, ikey);
ValuesToAssert v("", "");
ASSERT_OK(reader.Get(
ReadOptions(), Slice(not_found_key), &v, AssertValues, nullptr));
ASSERT_EQ(0, v.call_count);
ASSERT_OK(reader.status());
// Search for a key with an independent hash value.
std::string not_found_user_key2 = "key" + NumToStr(num_items + 1);
AddHashLookups(not_found_user_key2, kNumHashFunc, kNumHashFunc);
ParsedInternalKey ikey2(not_found_user_key2, 1000, kTypeValue);
std::string not_found_key2;
AppendInternalKey(&not_found_key2, ikey2);
ASSERT_OK(reader.Get(
ReadOptions(), Slice(not_found_key2), &v, AssertValues, nullptr));
ASSERT_EQ(0, v.call_count);
ASSERT_OK(reader.status());
// Test read with corrupted key.
Slice corrupt_key("corrupt_ikey");
ASSERT_TRUE(!ParseInternalKey(corrupt_key, &ikey));
ASSERT_TRUE(reader.Get(
ReadOptions(), corrupt_key, &v,
AssertValues, nullptr).IsCorruption());
ASSERT_EQ(0, v.call_count);
ASSERT_OK(reader.status());
// Test read when key is unused key.
std::string unused_key =
reader.GetTableProperties()->user_collected_properties.at(
CuckooTablePropertyNames::kEmptyKey);
// Add hash values that map to empty buckets.
AddHashLookups(ExtractUserKey(unused_key).ToString(),
kNumHashFunc, kNumHashFunc);
ASSERT_OK(reader.Get(
ReadOptions(), Slice(unused_key), &v, AssertValues, nullptr));
ASSERT_EQ(0, v.call_count);
ASSERT_OK(reader.status());
}
// Performance tests
namespace {
bool DoNothing(void* arg, const ParsedInternalKey& k, const Slice& v) {
// Deliberately empty.
return false;
}
bool CheckValue(void* cnt_ptr, const ParsedInternalKey& k, const Slice& v) {
++*reinterpret_cast<int*>(cnt_ptr);
std::string expected_value;
AppendInternalKey(&expected_value, k);
ASSERT_EQ(0, v.compare(Slice(&expected_value[0], v.size())));
return false;
}
// Create last level file as we are interested in measuring performance of
// last level file only.
void BM_CuckooRead(uint64_t num, uint32_t key_length,
uint32_t value_length, uint64_t num_reads, double hash_ratio) {
assert(value_length <= key_length);
assert(8 <= key_length);
std::vector<std::string> keys;
Options options;
options.allow_mmap_reads = true;
Env* env = options.env;
EnvOptions env_options = EnvOptions(options);
uint64_t file_size;
if (FLAGS_file_dir.empty()) {
FLAGS_file_dir = test::TmpDir();
}
std::string fname = FLAGS_file_dir + "/cuckoo_read_benchmark";
unique_ptr<WritableFile> writable_file;
ASSERT_OK(env->NewWritableFile(fname, &writable_file, env_options));
CuckooTableBuilder builder(
writable_file.get(), hash_ratio,
kMaxNumHashTable, 1000, GetSliceMurmurHash);
ASSERT_OK(builder.status());
for (uint64_t key_idx = 0; key_idx < num; ++key_idx) {
// Value is just a part of key.
std::string new_key(reinterpret_cast<char*>(&key_idx), sizeof(key_idx));
new_key = std::string(key_length - new_key.size(), 'k') + new_key;
ParsedInternalKey ikey(new_key, 0, kTypeValue);
std::string full_key;
AppendInternalKey(&full_key, ikey);
builder.Add(Slice(full_key), Slice(&full_key[0], value_length));
ASSERT_EQ(builder.NumEntries(), key_idx + 1);
ASSERT_OK(builder.status());
keys.push_back(full_key);
}
ASSERT_OK(builder.Finish());
ASSERT_EQ(num, builder.NumEntries());
file_size = builder.FileSize();
ASSERT_OK(writable_file->Close());
unique_ptr<RandomAccessFile> read_file;
ASSERT_OK(env->NewRandomAccessFile(fname, &read_file, env_options));
CuckooTableReader reader(
options,
std::move(read_file),
file_size,
GetSliceMurmurHash);
ASSERT_OK(reader.status());
const UserCollectedProperties user_props =
reader.GetTableProperties()->user_collected_properties;
const uint32_t num_hash_fun = *reinterpret_cast<const uint32_t*>(
user_props.at(CuckooTablePropertyNames::kNumHashTable).data());
fprintf(stderr, "With %" PRIu64 " items and hash table ratio %f, number of"
" hash functions used: %u.\n", num, hash_ratio, num_hash_fun);
ReadOptions r_options;
for (auto& key : keys) {
int cnt = 0;
ASSERT_OK(reader.Get(r_options, Slice(key), &cnt, CheckValue, nullptr));
ASSERT_EQ(1, cnt);
}
// Shuffle Keys.
std::random_shuffle(keys.begin(), keys.end());
uint64_t time_now = env->NowMicros();
reader.NewIterator(ReadOptions(), nullptr);
fprintf(stderr, "Time taken for preparing iterator for %" PRIu64 " items: %" PRIu64 " ms.\n",
num, (env->NowMicros() - time_now)/1000);
time_now = env->NowMicros();
for (uint64_t i = 0; i < num_reads; ++i) {
reader.Get(r_options, Slice(keys[i % num]), nullptr, DoNothing, nullptr);
}
fprintf(stderr, "Time taken per op is %.3fus\n",
(env->NowMicros() - time_now)*1.0/num_reads);
}
} // namespace.
TEST(CuckooReaderTest, Performance) {
// In all these tests, num_reads = 10*num_items.
if (!FLAGS_enable_perf) {
return;
}
BM_CuckooRead(100000, 8, 4, 1000000, 0.9);
BM_CuckooRead(1000000, 8, 4, 10000000, 0.9);
BM_CuckooRead(1000000, 8, 4, 10000000, 0.7);
BM_CuckooRead(10000000, 8, 4, 100000000, 0.9);
BM_CuckooRead(10000000, 8, 4, 100000000, 0.7);
}
} // namespace rocksdb
int main(int argc, char** argv) {
ParseCommandLineFlags(&argc, &argv, true);
rocksdb::test::RunAllTests();
return 0;
}
#endif // GFLAGS.
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