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rocksdb/table/table_test.cc

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// 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.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// 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.
#include <map>
#include <string>
#include <memory>
#include <vector>
#include "db/dbformat.h"
#include "db/db_statistics.h"
#include "db/memtable.h"
#include "db/write_batch_internal.h"
#include "rocksdb/cache.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/memtablerep.h"
#include "table/block_based_table_builder.h"
#include "table/block_based_table_reader.h"
#include "table/block_builder.h"
#include "table/block.h"
#include "table/format.h"
#include "util/random.h"
#include "util/testharness.h"
#include "util/testutil.h"
namespace rocksdb {
namespace {
// Return reverse of "key".
// Used to test non-lexicographic comparators.
static std::string Reverse(const Slice& key) {
std::string str(key.ToString());
std::string rev("");
for (std::string::reverse_iterator rit = str.rbegin();
rit != str.rend(); ++rit) {
rev.push_back(*rit);
}
return rev;
}
static Options GetDefaultOptions() {
Options options;
options.SetUpDefaultFlushBlockPolicyFactory();
return options;
}
class ReverseKeyComparator : public Comparator {
public:
virtual const char* Name() const {
return "rocksdb.ReverseBytewiseComparator";
}
virtual int Compare(const Slice& a, const Slice& b) const {
return BytewiseComparator()->Compare(Reverse(a), Reverse(b));
}
virtual void FindShortestSeparator(
std::string* start,
const Slice& limit) const {
std::string s = Reverse(*start);
std::string l = Reverse(limit);
BytewiseComparator()->FindShortestSeparator(&s, l);
*start = Reverse(s);
}
virtual void FindShortSuccessor(std::string* key) const {
std::string s = Reverse(*key);
BytewiseComparator()->FindShortSuccessor(&s);
*key = Reverse(s);
}
};
} // namespace
static ReverseKeyComparator reverse_key_comparator;
static void Increment(const Comparator* cmp, std::string* key) {
if (cmp == BytewiseComparator()) {
key->push_back('\0');
} else {
assert(cmp == &reverse_key_comparator);
std::string rev = Reverse(*key);
rev.push_back('\0');
*key = Reverse(rev);
}
}
// An STL comparator that uses a Comparator
namespace anon {
struct STLLessThan {
const Comparator* cmp;
STLLessThan() : cmp(BytewiseComparator()) { }
explicit STLLessThan(const Comparator* c) : cmp(c) { }
bool operator()(const std::string& a, const std::string& b) const {
return cmp->Compare(Slice(a), Slice(b)) < 0;
}
};
} // namespace
class StringSink: public WritableFile {
public:
~StringSink() { }
const std::string& contents() const { return contents_; }
virtual Status Close() { return Status::OK(); }
virtual Status Flush() { return Status::OK(); }
virtual Status Sync() { return Status::OK(); }
virtual Status Append(const Slice& data) {
contents_.append(data.data(), data.size());
return Status::OK();
}
private:
std::string contents_;
};
class StringSource: public RandomAccessFile {
public:
StringSource(const Slice& contents, uint64_t uniq_id)
: contents_(contents.data(), contents.size()), uniq_id_(uniq_id) {
}
virtual ~StringSource() { }
uint64_t Size() const { return contents_.size(); }
virtual Status Read(uint64_t offset, size_t n, Slice* result,
char* scratch) const {
if (offset > contents_.size()) {
return Status::InvalidArgument("invalid Read offset");
}
if (offset + n > contents_.size()) {
n = contents_.size() - offset;
}
memcpy(scratch, &contents_[offset], n);
*result = Slice(scratch, n);
return Status::OK();
}
virtual size_t GetUniqueId(char* id, size_t max_size) const {
if (max_size < 20) {
return 0;
}
char* rid = id;
rid = EncodeVarint64(rid, uniq_id_);
rid = EncodeVarint64(rid, 0);
return static_cast<size_t>(rid-id);
}
private:
std::string contents_;
uint64_t uniq_id_;
};
typedef std::map<std::string, std::string, anon::STLLessThan> KVMap;
// Helper class for tests to unify the interface between
// BlockBuilder/TableBuilder and Block/Table.
class Constructor {
public:
explicit Constructor(const Comparator* cmp) : data_(anon::STLLessThan(cmp)) { }
virtual ~Constructor() { }
void Add(const std::string& key, const Slice& value) {
data_[key] = value.ToString();
}
// Finish constructing the data structure with all the keys that have
// been added so far. Returns the keys in sorted order in "*keys"
// and stores the key/value pairs in "*kvmap"
void Finish(const Options& options,
std::vector<std::string>* keys,
KVMap* kvmap) {
*kvmap = data_;
keys->clear();
for (KVMap::const_iterator it = data_.begin();
it != data_.end();
++it) {
keys->push_back(it->first);
}
data_.clear();
Status s = FinishImpl(options, *kvmap);
ASSERT_TRUE(s.ok()) << s.ToString();
}
// Construct the data structure from the data in "data"
virtual Status FinishImpl(const Options& options, const KVMap& data) = 0;
virtual Iterator* NewIterator() const = 0;
virtual const KVMap& data() { return data_; }
virtual DB* db() const { return nullptr; } // Overridden in DBConstructor
private:
KVMap data_;
};
class BlockConstructor: public Constructor {
public:
explicit BlockConstructor(const Comparator* cmp)
: Constructor(cmp),
comparator_(cmp),
block_(nullptr) { }
~BlockConstructor() {
delete block_;
}
virtual Status FinishImpl(const Options& options, const KVMap& data) {
delete block_;
block_ = nullptr;
BlockBuilder builder(&options);
for (KVMap::const_iterator it = data.begin();
it != data.end();
++it) {
builder.Add(it->first, it->second);
}
// Open the block
data_ = builder.Finish().ToString();
BlockContents contents;
contents.data = data_;
contents.cachable = false;
contents.heap_allocated = false;
block_ = new Block(contents);
return Status::OK();
}
virtual Iterator* NewIterator() const {
return block_->NewIterator(comparator_);
}
private:
const Comparator* comparator_;
std::string data_;
Block* block_;
BlockConstructor();
};
class BlockBasedTableConstructor: public Constructor {
public:
explicit BlockBasedTableConstructor(
const Comparator* cmp)
: Constructor(cmp) {
}
~BlockBasedTableConstructor() {
Reset();
}
virtual Status FinishImpl(const Options& options, const KVMap& data) {
Reset();
sink_.reset(new StringSink());
BlockBasedTableBuilder builder(options, sink_.get(), options.compression);
for (KVMap::const_iterator it = data.begin();
it != data.end();
++it) {
builder.Add(it->first, it->second);
ASSERT_TRUE(builder.status().ok());
}
Status s = builder.Finish();
ASSERT_TRUE(s.ok()) << s.ToString();
ASSERT_EQ(sink_->contents().size(), builder.FileSize());
// Open the table
uniq_id_ = cur_uniq_id_++;
source_.reset(new StringSource(sink_->contents(), uniq_id_));
unique_ptr<TableFactory> table_factory;
return options.table_factory->GetTableReader(options, soptions,
std::move(source_),
sink_->contents().size(),
&table_reader_);
}
virtual Iterator* NewIterator() const {
return table_reader_->NewIterator(ReadOptions());
}
uint64_t ApproximateOffsetOf(const Slice& key) const {
return table_reader_->ApproximateOffsetOf(key);
}
virtual Status Reopen(const Options& options) {
source_.reset(new StringSource(sink_->contents(), uniq_id_));
return options.table_factory->GetTableReader(options, soptions,
std::move(source_),
sink_->contents().size(),
&table_reader_);
}
virtual TableReader* table_reader() {
return table_reader_.get();
}
private:
void Reset() {
uniq_id_ = 0;
table_reader_.reset();
sink_.reset();
source_.reset();
}
uint64_t uniq_id_;
unique_ptr<StringSink> sink_;
unique_ptr<StringSource> source_;
unique_ptr<TableReader> table_reader_;
BlockBasedTableConstructor();
static uint64_t cur_uniq_id_;
const EnvOptions soptions;
};
uint64_t BlockBasedTableConstructor::cur_uniq_id_ = 1;
// A helper class that converts internal format keys into user keys
class KeyConvertingIterator: public Iterator {
public:
explicit KeyConvertingIterator(Iterator* iter) : iter_(iter) { }
virtual ~KeyConvertingIterator() { delete iter_; }
virtual bool Valid() const { return iter_->Valid(); }
virtual void Seek(const Slice& target) {
ParsedInternalKey ikey(target, kMaxSequenceNumber, kTypeValue);
std::string encoded;
AppendInternalKey(&encoded, ikey);
iter_->Seek(encoded);
}
virtual void SeekToFirst() { iter_->SeekToFirst(); }
virtual void SeekToLast() { iter_->SeekToLast(); }
virtual void Next() { iter_->Next(); }
virtual void Prev() { iter_->Prev(); }
virtual Slice key() const {
assert(Valid());
ParsedInternalKey key;
if (!ParseInternalKey(iter_->key(), &key)) {
status_ = Status::Corruption("malformed internal key");
return Slice("corrupted key");
}
return key.user_key;
}
virtual Slice value() const { return iter_->value(); }
virtual Status status() const {
return status_.ok() ? iter_->status() : status_;
}
private:
mutable Status status_;
Iterator* iter_;
// No copying allowed
KeyConvertingIterator(const KeyConvertingIterator&);
void operator=(const KeyConvertingIterator&);
};
class MemTableConstructor: public Constructor {
public:
explicit MemTableConstructor(const Comparator* cmp)
: Constructor(cmp),
internal_comparator_(cmp),
table_factory_(new SkipListFactory) {
memtable_ = new MemTable(internal_comparator_, table_factory_);
memtable_->Ref();
}
~MemTableConstructor() {
memtable_->Unref();
}
virtual Status FinishImpl(const Options& options, const KVMap& data) {
memtable_->Unref();
memtable_ = new MemTable(internal_comparator_, table_factory_);
memtable_->Ref();
int seq = 1;
for (KVMap::const_iterator it = data.begin();
it != data.end();
++it) {
memtable_->Add(seq, kTypeValue, it->first, it->second);
seq++;
}
return Status::OK();
}
virtual Iterator* NewIterator() const {
return new KeyConvertingIterator(memtable_->NewIterator());
}
private:
InternalKeyComparator internal_comparator_;
MemTable* memtable_;
std::shared_ptr<SkipListFactory> table_factory_;
};
class DBConstructor: public Constructor {
public:
explicit DBConstructor(const Comparator* cmp)
: Constructor(cmp),
comparator_(cmp) {
db_ = nullptr;
NewDB();
}
~DBConstructor() {
delete db_;
}
virtual Status FinishImpl(const Options& options, const KVMap& data) {
delete db_;
db_ = nullptr;
NewDB();
for (KVMap::const_iterator it = data.begin();
it != data.end();
++it) {
WriteBatch batch;
batch.Put(it->first, it->second);
ASSERT_TRUE(db_->Write(WriteOptions(), &batch).ok());
}
return Status::OK();
}
virtual Iterator* NewIterator() const {
return db_->NewIterator(ReadOptions());
}
virtual DB* db() const { return db_; }
private:
void NewDB() {
std::string name = test::TmpDir() + "/table_testdb";
Options options = GetDefaultOptions();
options.comparator = comparator_;
Status status = DestroyDB(name, options);
ASSERT_TRUE(status.ok()) << status.ToString();
options.create_if_missing = true;
options.error_if_exists = true;
options.write_buffer_size = 10000; // Something small to force merging
status = DB::Open(options, name, &db_);
ASSERT_TRUE(status.ok()) << status.ToString();
}
const Comparator* comparator_;
DB* db_;
};
static bool SnappyCompressionSupported() {
std::string out;
Slice in = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
return port::Snappy_Compress(GetDefaultOptions().compression_opts,
in.data(), in.size(),
&out);
}
static bool ZlibCompressionSupported() {
std::string out;
Slice in = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
return port::Zlib_Compress(GetDefaultOptions().compression_opts,
in.data(), in.size(),
&out);
}
#ifdef BZIP2
static bool BZip2CompressionSupported() {
std::string out;
Slice in = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
return port::BZip2_Compress(GetDefaultOptions().compression_opts,
in.data(), in.size(),
&out);
}
#endif
enum TestType {
TABLE_TEST,
BLOCK_TEST,
MEMTABLE_TEST,
DB_TEST
};
struct TestArgs {
TestType type;
bool reverse_compare;
int restart_interval;
CompressionType compression;
};
static std::vector<TestArgs> Generate_Arg_List() {
std::vector<TestArgs> ret;
TestType test_type[4] = {TABLE_TEST, BLOCK_TEST, MEMTABLE_TEST, DB_TEST};
int test_type_len = 4;
bool reverse_compare[2] = {false, true};
int reverse_compare_len = 2;
int restart_interval[3] = {16, 1, 1024};
int restart_interval_len = 3;
// Only add compression if it is supported
std::vector<CompressionType> compression_types;
compression_types.push_back(kNoCompression);
#ifdef SNAPPY
if (SnappyCompressionSupported())
compression_types.push_back(kSnappyCompression);
#endif
#ifdef ZLIB
if (ZlibCompressionSupported())
compression_types.push_back(kZlibCompression);
#endif
#ifdef BZIP2
if (BZip2CompressionSupported())
compression_types.push_back(kBZip2Compression);
#endif
for(int i =0; i < test_type_len; i++)
for (int j =0; j < reverse_compare_len; j++)
for (int k =0; k < restart_interval_len; k++)
for (unsigned int n =0; n < compression_types.size(); n++) {
TestArgs one_arg;
one_arg.type = test_type[i];
one_arg.reverse_compare = reverse_compare[j];
one_arg.restart_interval = restart_interval[k];
one_arg.compression = compression_types[n];
ret.push_back(one_arg);
}
return ret;
}
class Harness {
public:
Harness() : constructor_(nullptr) { }
void Init(const TestArgs& args) {
delete constructor_;
constructor_ = nullptr;
options_ = GetDefaultOptions();
options_.block_restart_interval = args.restart_interval;
options_.compression = args.compression;
// Use shorter block size for tests to exercise block boundary
// conditions more.
options_.block_size = 256;
if (args.reverse_compare) {
options_.comparator = &reverse_key_comparator;
}
switch (args.type) {
case TABLE_TEST:
constructor_ = new BlockBasedTableConstructor(options_.comparator);
break;
case BLOCK_TEST:
constructor_ = new BlockConstructor(options_.comparator);
break;
case MEMTABLE_TEST:
constructor_ = new MemTableConstructor(options_.comparator);
break;
case DB_TEST:
constructor_ = new DBConstructor(options_.comparator);
break;
}
}
~Harness() {
delete constructor_;
}
void Add(const std::string& key, const std::string& value) {
constructor_->Add(key, value);
}
void Test(Random* rnd) {
std::vector<std::string> keys;
KVMap data;
constructor_->Finish(options_, &keys, &data);
TestForwardScan(keys, data);
TestBackwardScan(keys, data);
TestRandomAccess(rnd, keys, data);
}
void TestForwardScan(const std::vector<std::string>& keys,
const KVMap& data) {
Iterator* iter = constructor_->NewIterator();
ASSERT_TRUE(!iter->Valid());
iter->SeekToFirst();
for (KVMap::const_iterator model_iter = data.begin();
model_iter != data.end();
++model_iter) {
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
iter->Next();
}
ASSERT_TRUE(!iter->Valid());
delete iter;
}
void TestBackwardScan(const std::vector<std::string>& keys,
const KVMap& data) {
Iterator* iter = constructor_->NewIterator();
ASSERT_TRUE(!iter->Valid());
iter->SeekToLast();
for (KVMap::const_reverse_iterator model_iter = data.rbegin();
model_iter != data.rend();
++model_iter) {
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
iter->Prev();
}
ASSERT_TRUE(!iter->Valid());
delete iter;
}
void TestRandomAccess(Random* rnd,
const std::vector<std::string>& keys,
const KVMap& data) {
static const bool kVerbose = false;
Iterator* iter = constructor_->NewIterator();
ASSERT_TRUE(!iter->Valid());
KVMap::const_iterator model_iter = data.begin();
if (kVerbose) fprintf(stderr, "---\n");
for (int i = 0; i < 200; i++) {
const int toss = rnd->Uniform(5);
switch (toss) {
case 0: {
if (iter->Valid()) {
if (kVerbose) fprintf(stderr, "Next\n");
iter->Next();
++model_iter;
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
}
break;
}
case 1: {
if (kVerbose) fprintf(stderr, "SeekToFirst\n");
iter->SeekToFirst();
model_iter = data.begin();
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
break;
}
case 2: {
std::string key = PickRandomKey(rnd, keys);
model_iter = data.lower_bound(key);
if (kVerbose) fprintf(stderr, "Seek '%s'\n",
EscapeString(key).c_str());
iter->Seek(Slice(key));
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
break;
}
case 3: {
if (iter->Valid()) {
if (kVerbose) fprintf(stderr, "Prev\n");
iter->Prev();
if (model_iter == data.begin()) {
model_iter = data.end(); // Wrap around to invalid value
} else {
--model_iter;
}
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
}
break;
}
case 4: {
if (kVerbose) fprintf(stderr, "SeekToLast\n");
iter->SeekToLast();
if (keys.empty()) {
model_iter = data.end();
} else {
std::string last = data.rbegin()->first;
model_iter = data.lower_bound(last);
}
ASSERT_EQ(ToString(data, model_iter), ToString(iter));
break;
}
}
}
delete iter;
}
std::string ToString(const KVMap& data, const KVMap::const_iterator& it) {
if (it == data.end()) {
return "END";
} else {
return "'" + it->first + "->" + it->second + "'";
}
}
std::string ToString(const KVMap& data,
const KVMap::const_reverse_iterator& it) {
if (it == data.rend()) {
return "END";
} else {
return "'" + it->first + "->" + it->second + "'";
}
}
std::string ToString(const Iterator* it) {
if (!it->Valid()) {
return "END";
} else {
return "'" + it->key().ToString() + "->" + it->value().ToString() + "'";
}
}
std::string PickRandomKey(Random* rnd, const std::vector<std::string>& keys) {
if (keys.empty()) {
return "foo";
} else {
const int index = rnd->Uniform(keys.size());
std::string result = keys[index];
switch (rnd->Uniform(3)) {
case 0:
// Return an existing key
break;
case 1: {
// Attempt to return something smaller than an existing key
if (result.size() > 0 && result[result.size()-1] > '\0') {
result[result.size()-1]--;
}
break;
}
case 2: {
// Return something larger than an existing key
Increment(options_.comparator, &result);
break;
}
}
return result;
}
}
// Returns nullptr if not running against a DB
DB* db() const { return constructor_->db(); }
private:
Options options_ = GetDefaultOptions();
Constructor* constructor_;
};
// Test the empty key
TEST(Harness, SimpleEmptyKey) {
std::vector<TestArgs> args = Generate_Arg_List();
for (unsigned int i = 0; i < args.size(); i++) {
Init(args[i]);
Random rnd(test::RandomSeed() + 1);
Add("", "v");
Test(&rnd);
}
}
TEST(Harness, SimpleSingle) {
std::vector<TestArgs> args = Generate_Arg_List();
for (unsigned int i = 0; i < args.size(); i++) {
Init(args[i]);
Random rnd(test::RandomSeed() + 2);
Add("abc", "v");
Test(&rnd);
}
}
TEST(Harness, SimpleMulti) {
std::vector<TestArgs> args = Generate_Arg_List();
for (unsigned int i = 0; i < args.size(); i++) {
Init(args[i]);
Random rnd(test::RandomSeed() + 3);
Add("abc", "v");
Add("abcd", "v");
Add("ac", "v2");
Test(&rnd);
}
}
TEST(Harness, SimpleSpecialKey) {
std::vector<TestArgs> args = Generate_Arg_List();
for (unsigned int i = 0; i < args.size(); i++) {
Init(args[i]);
Random rnd(test::RandomSeed() + 4);
Add("\xff\xff", "v3");
Test(&rnd);
}
}
static bool Between(uint64_t val, uint64_t low, uint64_t high) {
bool result = (val >= low) && (val <= high);
if (!result) {
fprintf(stderr, "Value %llu is not in range [%llu, %llu]\n",
(unsigned long long)(val),
(unsigned long long)(low),
(unsigned long long)(high));
}
return result;
}
class TableTest { };
// This test include all the basic checks except those for index size and block
// size, which will be conducted in separated unit tests.
TEST(TableTest, BasicTableStats) {
BlockBasedTableConstructor c(BytewiseComparator());
c.Add("a1", "val1");
c.Add("b2", "val2");
c.Add("c3", "val3");
c.Add("d4", "val4");
c.Add("e5", "val5");
c.Add("f6", "val6");
c.Add("g7", "val7");
c.Add("h8", "val8");
c.Add("j9", "val9");
std::vector<std::string> keys;
KVMap kvmap;
Options options = GetDefaultOptions();
options.compression = kNoCompression;
options.block_restart_interval = 1;
c.Finish(options, &keys, &kvmap);
auto& stats = c.table_reader()->GetTableStats();
ASSERT_EQ(kvmap.size(), stats.num_entries);
auto raw_key_size = kvmap.size() * 2ul;
auto raw_value_size = kvmap.size() * 4ul;
ASSERT_EQ(raw_key_size, stats.raw_key_size);
ASSERT_EQ(raw_value_size, stats.raw_value_size);
ASSERT_EQ(1ul, stats.num_data_blocks);
ASSERT_EQ("", stats.filter_policy_name); // no filter policy is used
// Verify data size.
BlockBuilder block_builder(&options);
for (const auto& item : kvmap) {
block_builder.Add(item.first, item.second);
}
Slice content = block_builder.Finish();
ASSERT_EQ(
content.size() + kBlockTrailerSize,
stats.data_size
);
}
TEST(TableTest, FilterPolicyNameStats) {
BlockBasedTableConstructor c(BytewiseComparator());
c.Add("a1", "val1");
std::vector<std::string> keys;
KVMap kvmap;
Options options = GetDefaultOptions();
std::unique_ptr<const FilterPolicy> filter_policy(
NewBloomFilterPolicy(10)
);
options.filter_policy = filter_policy.get();
c.Finish(options, &keys, &kvmap);
auto& stats = c.table_reader()->GetTableStats();
ASSERT_EQ("rocksdb.BuiltinBloomFilter", stats.filter_policy_name);
}
static std::string RandomString(Random* rnd, int len) {
std::string r;
test::RandomString(rnd, len, &r);
return r;
}
// It's very hard to figure out the index block size of a block accurately.
// To make sure we get the index size, we just make sure as key number
// grows, the filter block size also grows.
TEST(TableTest, IndexSizeStat) {
uint64_t last_index_size = 0;
// we need to use random keys since the pure human readable texts
// may be well compressed, resulting insignifcant change of index
// block size.
Random rnd(test::RandomSeed());
std::vector<std::string> keys;
for (int i = 0; i < 100; ++i) {
keys.push_back(RandomString(&rnd, 10000));
}
// Each time we load one more key to the table. the table index block
// size is expected to be larger than last time's.
for (size_t i = 1; i < keys.size(); ++i) {
BlockBasedTableConstructor c(BytewiseComparator());
for (size_t j = 0; j < i; ++j) {
c.Add(keys[j], "val");
}
std::vector<std::string> ks;
KVMap kvmap;
Options options = GetDefaultOptions();
options.compression = kNoCompression;
options.block_restart_interval = 1;
c.Finish(options, &ks, &kvmap);
auto index_size =
c.table_reader()->GetTableStats().index_size;
ASSERT_GT(index_size, last_index_size);
last_index_size = index_size;
}
}
TEST(TableTest, NumBlockStat) {
Random rnd(test::RandomSeed());
BlockBasedTableConstructor c(BytewiseComparator());
Options options;
options.compression = kNoCompression;
options.block_restart_interval = 1;
options.block_size = 1000;
// Block Size changed, need to set up a new flush policy to reflect the
// change.
options.SetUpDefaultFlushBlockPolicyFactory();
for (int i = 0; i < 10; ++i) {
// the key/val are slightly smaller than block size, so that each block
// holds roughly one key/value pair.
c.Add(RandomString(&rnd, 900), "val");
}
std::vector<std::string> ks;
KVMap kvmap;
c.Finish(options, &ks, &kvmap);
ASSERT_EQ(
kvmap.size(),
c.table_reader()->GetTableStats().num_data_blocks
);
}
class BlockCacheStats {
public:
explicit BlockCacheStats(std::shared_ptr<Statistics> statistics) {
block_cache_miss =
statistics.get()->getTickerCount(BLOCK_CACHE_MISS);
block_cache_hit =
statistics.get()->getTickerCount(BLOCK_CACHE_HIT);
index_block_cache_miss =
statistics.get()->getTickerCount(BLOCK_CACHE_INDEX_MISS);
index_block_cache_hit =
statistics.get()->getTickerCount(BLOCK_CACHE_INDEX_HIT);
data_block_cache_miss =
statistics.get()->getTickerCount(BLOCK_CACHE_DATA_MISS);
data_block_cache_hit =
statistics.get()->getTickerCount(BLOCK_CACHE_DATA_HIT);
}
// Check if the fetched stats matches the expected ones.
void AssertEqual(
long index_block_cache_miss,
long index_block_cache_hit,
long data_block_cache_miss,
long data_block_cache_hit) const {
ASSERT_EQ(index_block_cache_miss, this->index_block_cache_miss);
ASSERT_EQ(index_block_cache_hit, this->index_block_cache_hit);
ASSERT_EQ(data_block_cache_miss, this->data_block_cache_miss);
ASSERT_EQ(data_block_cache_hit, this->data_block_cache_hit);
ASSERT_EQ(
index_block_cache_miss + data_block_cache_miss,
this->block_cache_miss
);
ASSERT_EQ(
index_block_cache_hit + data_block_cache_hit,
this->block_cache_hit
);
}
private:
long block_cache_miss = 0;
long block_cache_hit = 0;
long index_block_cache_miss = 0;
long index_block_cache_hit = 0;
long data_block_cache_miss = 0;
long data_block_cache_hit = 0;
};
TEST(TableTest, BlockCacheTest) {
// -- Table construction
Options options;
options.create_if_missing = true;
options.statistics = CreateDBStatistics();
options.block_cache = NewLRUCache(1024);
std::vector<std::string> keys;
KVMap kvmap;
BlockBasedTableConstructor c(BytewiseComparator());
c.Add("key", "value");
c.Finish(options, &keys, &kvmap);
// -- PART 1: Open with regular block cache.
// Since block_cache is disabled, no cache activities will be involved.
unique_ptr<Iterator> iter;
// At first, no block will be accessed.
{
BlockCacheStats stats(options.statistics);
// index will be added to block cache.
stats.AssertEqual(
1, // index block miss
0,
0,
0
);
}
// Only index block will be accessed
{
iter.reset(c.NewIterator());
BlockCacheStats stats(options.statistics);
// NOTE: to help better highlight the "detla" of each ticker, I use
// <last_value> + <added_value> to indicate the increment of changed
// value; other numbers remain the same.
stats.AssertEqual(
1,
0 + 1, // index block hit
0,
0
);
}
// Only data block will be accessed
{
iter->SeekToFirst();
BlockCacheStats stats(options.statistics);
stats.AssertEqual(
1,
1,
0 + 1, // data block miss
0
);
}
// Data block will be in cache
{
iter.reset(c.NewIterator());
iter->SeekToFirst();
BlockCacheStats stats(options.statistics);
stats.AssertEqual(
1,
1 + 1, // index block hit
1,
0 + 1 // data block hit
);
}
// release the iterator so that the block cache can reset correctly.
iter.reset();
// -- PART 2: Open without block cache
options.block_cache.reset();
options.statistics = CreateDBStatistics(); // reset the stats
c.Reopen(options);
{
iter.reset(c.NewIterator());
iter->SeekToFirst();
ASSERT_EQ("key", iter->key().ToString());
BlockCacheStats stats(options.statistics);
// Nothing is affected at all
stats.AssertEqual(0, 0, 0, 0);
}
// -- PART 3: Open with very small block cache
// In this test, no block will ever get hit since the block cache is
// too small to fit even one entry.
options.block_cache = NewLRUCache(1);
c.Reopen(options);
{
BlockCacheStats stats(options.statistics);
stats.AssertEqual(
1, // index block miss
0,
0,
0
);
}
{
// Both index and data block get accessed.
// It first cache index block then data block. But since the cache size
// is only 1, index block will be purged after data block is inserted.
iter.reset(c.NewIterator());
BlockCacheStats stats(options.statistics);
stats.AssertEqual(
1 + 1, // index block miss
0,
0, // data block miss
0
);
}
{
// SeekToFirst() accesses data block. With similar reason, we expect data
// block's cache miss.
iter->SeekToFirst();
BlockCacheStats stats(options.statistics);
stats.AssertEqual(
2,
0,
0 + 1, // data block miss
0
);
}
}
TEST(TableTest, ApproximateOffsetOfPlain) {
BlockBasedTableConstructor c(BytewiseComparator());
c.Add("k01", "hello");
c.Add("k02", "hello2");
c.Add("k03", std::string(10000, 'x'));
c.Add("k04", std::string(200000, 'x'));
c.Add("k05", std::string(300000, 'x'));
c.Add("k06", "hello3");
c.Add("k07", std::string(100000, 'x'));
std::vector<std::string> keys;
KVMap kvmap;
Options options = GetDefaultOptions();
options.block_size = 1024;
options.compression = kNoCompression;
c.Finish(options, &keys, &kvmap);
ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01a"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"), 10000, 11000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04a"), 210000, 211000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k05"), 210000, 211000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k06"), 510000, 511000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k07"), 510000, 511000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"), 610000, 612000));
}
static void Do_Compression_Test(CompressionType comp) {
Random rnd(301);
BlockBasedTableConstructor c(BytewiseComparator());
std::string tmp;
c.Add("k01", "hello");
c.Add("k02", test::CompressibleString(&rnd, 0.25, 10000, &tmp));
c.Add("k03", "hello3");
c.Add("k04", test::CompressibleString(&rnd, 0.25, 10000, &tmp));
std::vector<std::string> keys;
KVMap kvmap;
Options options = GetDefaultOptions();
options.block_size = 1024;
options.compression = comp;
c.Finish(options, &keys, &kvmap);
ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"), 0, 0));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"), 2000, 3000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"), 2000, 3000));
ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"), 4000, 6000));
}
TEST(TableTest, ApproximateOffsetOfCompressed) {
CompressionType compression_state[2];
int valid = 0;
if (!SnappyCompressionSupported()) {
fprintf(stderr, "skipping snappy compression tests\n");
} else {
compression_state[valid] = kSnappyCompression;
valid++;
}
if (!ZlibCompressionSupported()) {
fprintf(stderr, "skipping zlib compression tests\n");
} else {
compression_state[valid] = kZlibCompression;
valid++;
}
for(int i =0; i < valid; i++)
{
Do_Compression_Test(compression_state[i]);
}
}
TEST(TableTest, BlockCacheLeak) {
// Check that when we reopen a table we don't lose access to blocks already
// in the cache. This test checks whether the Table actually makes use of the
// unique ID from the file.
Options opt = GetDefaultOptions();
opt.block_size = 1024;
opt.compression = kNoCompression;
opt.block_cache = NewLRUCache(16*1024*1024); // big enough so we don't ever
// lose cached values.
BlockBasedTableConstructor c(BytewiseComparator());
c.Add("k01", "hello");
c.Add("k02", "hello2");
c.Add("k03", std::string(10000, 'x'));
c.Add("k04", std::string(200000, 'x'));
c.Add("k05", std::string(300000, 'x'));
c.Add("k06", "hello3");
c.Add("k07", std::string(100000, 'x'));
std::vector<std::string> keys;
KVMap kvmap;
c.Finish(opt, &keys, &kvmap);
unique_ptr<Iterator> iter(c.NewIterator());
iter->SeekToFirst();
while (iter->Valid()) {
iter->key();
iter->value();
iter->Next();
}
ASSERT_OK(iter->status());
ASSERT_OK(c.Reopen(opt));
for (const std::string& key: keys) {
ASSERT_TRUE(c.table_reader()->TEST_KeyInCache(ReadOptions(), key));
}
}
TEST(Harness, Randomized) {
std::vector<TestArgs> args = Generate_Arg_List();
for (unsigned int i = 0; i < args.size(); i++) {
Init(args[i]);
Random rnd(test::RandomSeed() + 5);
for (int num_entries = 0; num_entries < 2000;
num_entries += (num_entries < 50 ? 1 : 200)) {
if ((num_entries % 10) == 0) {
fprintf(stderr, "case %d of %d: num_entries = %d\n",
(i + 1), int(args.size()), num_entries);
}
for (int e = 0; e < num_entries; e++) {
std::string v;
Add(test::RandomKey(&rnd, rnd.Skewed(4)),
test::RandomString(&rnd, rnd.Skewed(5), &v).ToString());
}
Test(&rnd);
}
}
}
TEST(Harness, RandomizedLongDB) {
Random rnd(test::RandomSeed());
TestArgs args = { DB_TEST, false, 16, kNoCompression };
Init(args);
int num_entries = 100000;
for (int e = 0; e < num_entries; e++) {
std::string v;
Add(test::RandomKey(&rnd, rnd.Skewed(4)),
test::RandomString(&rnd, rnd.Skewed(5), &v).ToString());
}
Test(&rnd);
// We must have created enough data to force merging
int files = 0;
for (int level = 0; level < db()->NumberLevels(); level++) {
std::string value;
char name[100];
snprintf(name, sizeof(name), "rocksdb.num-files-at-level%d", level);
ASSERT_TRUE(db()->GetProperty(name, &value));
files += atoi(value.c_str());
}
ASSERT_GT(files, 0);
}
class MemTableTest { };
TEST(MemTableTest, Simple) {
InternalKeyComparator cmp(BytewiseComparator());
auto table_factory = std::make_shared<SkipListFactory>();
MemTable* memtable = new MemTable(cmp, table_factory);
memtable->Ref();
WriteBatch batch;
Options options = GetDefaultOptions();
WriteBatchInternal::SetSequence(&batch, 100);
batch.Put(std::string("k1"), std::string("v1"));
batch.Put(std::string("k2"), std::string("v2"));
batch.Put(std::string("k3"), std::string("v3"));
batch.Put(std::string("largekey"), std::string("vlarge"));
ASSERT_TRUE(WriteBatchInternal::InsertInto(&batch, memtable, &options).ok());
Iterator* iter = memtable->NewIterator();
iter->SeekToFirst();
while (iter->Valid()) {
fprintf(stderr, "key: '%s' -> '%s'\n",
iter->key().ToString().c_str(),
iter->value().ToString().c_str());
iter->Next();
}
delete iter;
memtable->Unref();
}
} // namespace rocksdb
int main(int argc, char** argv) {
return rocksdb::test::RunAllTests();
}