rocksdb/db/comparator_db_test.cc

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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
// Copyright (c) 2013, 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.
#include <map>
#include <string>
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "util/hash.h"
#include "util/testharness.h"
#include "util/testutil.h"
#include "utilities/merge_operators.h"
using std::unique_ptr;
namespace rocksdb {
namespace {
static const Comparator* comparator;
// A comparator for std::map, using comparator
struct MapComparator {
bool operator()(const std::string& a, const std::string& b) const {
return comparator->Compare(a, b) < 0;
}
};
typedef std::map<std::string, std::string, MapComparator> KVMap;
class KVIter : public Iterator {
public:
explicit KVIter(const KVMap* map) : map_(map), iter_(map_->end()) {}
virtual bool Valid() const { return iter_ != map_->end(); }
virtual void SeekToFirst() { iter_ = map_->begin(); }
virtual void SeekToLast() {
if (map_->empty()) {
iter_ = map_->end();
} else {
iter_ = map_->find(map_->rbegin()->first);
}
}
virtual void Seek(const Slice& k) { iter_ = map_->lower_bound(k.ToString()); }
virtual void Next() { ++iter_; }
virtual void Prev() {
if (iter_ == map_->begin()) {
iter_ = map_->end();
return;
}
--iter_;
}
virtual Slice key() const { return iter_->first; }
virtual Slice value() const { return iter_->second; }
virtual Status status() const { return Status::OK(); }
private:
const KVMap* const map_;
KVMap::const_iterator iter_;
};
void AssertItersEqual(Iterator* iter1, Iterator* iter2) {
ASSERT_EQ(iter1->Valid(), iter2->Valid());
if (iter1->Valid()) {
ASSERT_EQ(iter1->key().ToString(), iter2->key().ToString());
ASSERT_EQ(iter1->value().ToString(), iter2->value().ToString());
}
}
// Measuring operations on DB (expect to be empty).
// source_strings are candidate keys
void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
Random* rnd, int num_writes, int num_iter_ops,
int num_trigger_flush) {
KVMap map;
for (int i = 0; i < num_writes; i++) {
if (num_trigger_flush > 0 && i != 0 && i % num_trigger_flush == 0) {
db->Flush(FlushOptions());
}
int type = rnd->Uniform(2);
int index = rnd->Uniform(source_strings.size());
auto& key = source_strings[index];
switch (type) {
case 0:
// put
map[key] = key;
ASSERT_OK(db->Put(WriteOptions(), key, key));
break;
case 1:
// delete
if (map.find(key) != map.end()) {
map.erase(key);
}
ASSERT_OK(db->Delete(WriteOptions(), key));
break;
default:
assert(false);
}
}
std::unique_ptr<Iterator> iter(db->NewIterator(ReadOptions()));
std::unique_ptr<Iterator> result_iter(new KVIter(&map));
bool is_valid = false;
for (int i = 0; i < num_iter_ops; i++) {
// Random walk and make sure iter and result_iter returns the
// same key and value
int type = rnd->Uniform(6);
ASSERT_OK(iter->status());
switch (type) {
case 0:
// Seek to First
iter->SeekToFirst();
result_iter->SeekToFirst();
break;
case 1:
// Seek to last
iter->SeekToLast();
result_iter->SeekToLast();
break;
case 2: {
// Seek to random key
auto key_idx = rnd->Uniform(source_strings.size());
auto key = source_strings[key_idx];
iter->Seek(key);
result_iter->Seek(key);
break;
}
case 3:
// Next
if (is_valid) {
iter->Next();
result_iter->Next();
} else {
continue;
}
break;
case 4:
// Prev
if (is_valid) {
iter->Prev();
result_iter->Prev();
} else {
continue;
}
break;
default: {
assert(type == 5);
auto key_idx = rnd->Uniform(source_strings.size());
auto key = source_strings[key_idx];
std::string result;
auto status = db->Get(ReadOptions(), key, &result);
if (map.find(key) == map.end()) {
ASSERT_TRUE(status.IsNotFound());
} else {
ASSERT_EQ(map[key], result);
}
break;
}
}
AssertItersEqual(iter.get(), result_iter.get());
is_valid = iter->Valid();
}
}
class DoubleComparator : public Comparator {
public:
DoubleComparator() {}
virtual const char* Name() const { return "DoubleComparator"; }
virtual int Compare(const Slice& a, const Slice& b) const {
double da = std::stod(a.ToString());
double db = std::stod(b.ToString());
if (da == db) {
return a.compare(b);
} else if (da > db) {
return 1;
} else {
return -1;
}
}
virtual void FindShortestSeparator(std::string* start,
const Slice& limit) const {}
virtual void FindShortSuccessor(std::string* key) const {}
};
class HashComparator : public Comparator {
public:
HashComparator() {}
virtual const char* Name() const { return "HashComparator"; }
virtual int Compare(const Slice& a, const Slice& b) const {
uint32_t ha = Hash(a.data(), a.size(), 66);
uint32_t hb = Hash(b.data(), b.size(), 66);
if (ha == hb) {
return a.compare(b);
} else if (ha > hb) {
return 1;
} else {
return -1;
}
}
virtual void FindShortestSeparator(std::string* start,
const Slice& limit) const {}
virtual void FindShortSuccessor(std::string* key) const {}
};
class TwoStrComparator : public Comparator {
public:
TwoStrComparator() {}
virtual const char* Name() const { return "TwoStrComparator"; }
virtual int Compare(const Slice& a, const Slice& b) const {
assert(a.size() >= 2);
assert(b.size() >= 2);
size_t size_a1 = static_cast<size_t>(a[0]);
size_t size_b1 = static_cast<size_t>(b[0]);
size_t size_a2 = static_cast<size_t>(a[1]);
size_t size_b2 = static_cast<size_t>(b[1]);
assert(size_a1 + size_a2 + 2 == a.size());
assert(size_b1 + size_b2 + 2 == b.size());
Slice a1 = Slice(a.data() + 2, size_a1);
Slice b1 = Slice(b.data() + 2, size_b1);
Slice a2 = Slice(a.data() + 2 + size_a1, size_a2);
Slice b2 = Slice(b.data() + 2 + size_b1, size_b2);
if (a1 != b1) {
return a1.compare(b1);
}
return a2.compare(b2);
}
virtual void FindShortestSeparator(std::string* start,
const Slice& limit) const {}
virtual void FindShortSuccessor(std::string* key) const {}
};
} // namespace
class ComparatorDBTest {
private:
std::string dbname_;
Env* env_;
DB* db_;
Options last_options_;
std::unique_ptr<const Comparator> comparator_guard;
public:
ComparatorDBTest() : env_(Env::Default()), db_(nullptr) {
comparator = BytewiseComparator();
dbname_ = test::TmpDir() + "/comparator_db_test";
ASSERT_OK(DestroyDB(dbname_, last_options_));
}
~ComparatorDBTest() {
delete db_;
ASSERT_OK(DestroyDB(dbname_, last_options_));
comparator = BytewiseComparator();
}
DB* GetDB() { return db_; }
void SetOwnedComparator(const Comparator* cmp) {
comparator_guard.reset(cmp);
comparator = cmp;
last_options_.comparator = cmp;
}
// Return the current option configuration.
Options* GetOptions() { return &last_options_; }
void DestroyAndReopen() {
// Destroy using last options
Destroy();
ASSERT_OK(TryReopen());
}
void Destroy() {
delete db_;
db_ = nullptr;
ASSERT_OK(DestroyDB(dbname_, last_options_));
}
Status TryReopen() {
delete db_;
db_ = nullptr;
last_options_.create_if_missing = true;
return DB::Open(last_options_, dbname_, &db_);
}
};
TEST(ComparatorDBTest, Bytewise) {
for (int rand_seed = 301; rand_seed < 306; rand_seed++) {
DestroyAndReopen();
Random rnd(rand_seed);
DoRandomIteraratorTest(GetDB(),
{"a", "b", "c", "d", "e", "f", "g", "h", "i"}, &rnd,
8, 100, 3);
}
}
TEST(ComparatorDBTest, SimpleSuffixReverseComparator) {
SetOwnedComparator(new test::SimpleSuffixReverseComparator());
for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
Options* opt = GetOptions();
opt->comparator = comparator;
DestroyAndReopen();
Random rnd(rnd_seed);
std::vector<std::string> source_strings;
std::vector<std::string> source_prefixes;
// Randomly generate 5 prefixes
for (int i = 0; i < 5; i++) {
source_prefixes.push_back(test::RandomHumanReadableString(&rnd, 8));
}
for (int j = 0; j < 20; j++) {
int prefix_index = rnd.Uniform(source_prefixes.size());
std::string key = source_prefixes[prefix_index] +
test::RandomHumanReadableString(&rnd, rnd.Uniform(8));
source_strings.push_back(key);
}
DoRandomIteraratorTest(GetDB(), source_strings, &rnd, 30, 600, 66);
}
}
TEST(ComparatorDBTest, Uint64Comparator) {
SetOwnedComparator(test::Uint64Comparator());
for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
Options* opt = GetOptions();
opt->comparator = comparator;
DestroyAndReopen();
Random rnd(rnd_seed);
Random64 rnd64(rnd_seed);
std::vector<std::string> source_strings;
// Randomly generate source keys
for (int i = 0; i < 100; i++) {
uint64_t r = rnd64.Next();
std::string str;
str.resize(8);
memcpy(&str[0], static_cast<void*>(&r), 8);
source_strings.push_back(str);
}
DoRandomIteraratorTest(GetDB(), source_strings, &rnd, 200, 1000, 66);
}
}
TEST(ComparatorDBTest, DoubleComparator) {
SetOwnedComparator(new DoubleComparator());
for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
Options* opt = GetOptions();
opt->comparator = comparator;
DestroyAndReopen();
Random rnd(rnd_seed);
std::vector<std::string> source_strings;
// Randomly generate source keys
for (int i = 0; i < 100; i++) {
uint32_t r = rnd.Next();
uint32_t divide_order = rnd.Uniform(8);
double to_divide = 1.0;
for (uint32_t j = 0; j < divide_order; j++) {
to_divide *= 10.0;
}
source_strings.push_back(std::to_string(r / to_divide));
}
DoRandomIteraratorTest(GetDB(), source_strings, &rnd, 200, 1000, 66);
}
}
TEST(ComparatorDBTest, HashComparator) {
SetOwnedComparator(new HashComparator());
for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
Options* opt = GetOptions();
opt->comparator = comparator;
DestroyAndReopen();
Random rnd(rnd_seed);
std::vector<std::string> source_strings;
// Randomly generate source keys
for (int i = 0; i < 100; i++) {
source_strings.push_back(test::RandomKey(&rnd, 8));
}
DoRandomIteraratorTest(GetDB(), source_strings, &rnd, 200, 1000, 66);
}
}
TEST(ComparatorDBTest, TwoStrComparator) {
SetOwnedComparator(new TwoStrComparator());
for (int rnd_seed = 301; rnd_seed < 316; rnd_seed++) {
Options* opt = GetOptions();
opt->comparator = comparator;
DestroyAndReopen();
Random rnd(rnd_seed);
std::vector<std::string> source_strings;
// Randomly generate source keys
for (int i = 0; i < 100; i++) {
std::string str;
uint32_t size1 = rnd.Uniform(8);
uint32_t size2 = rnd.Uniform(8);
str.append(1, static_cast<char>(size1));
str.append(1, static_cast<char>(size2));
str.append(test::RandomKey(&rnd, size1));
str.append(test::RandomKey(&rnd, size2));
source_strings.push_back(str);
}
DoRandomIteraratorTest(GetDB(), source_strings, &rnd, 200, 1000, 66);
}
}
} // namespace rocksdb
int main(int argc, char** argv) { return rocksdb::test::RunAllTests(); }