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db_iter_test.cc
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db_iter_test.cc
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "db/db_iter.h"
#include <algorithm>
#include <string>
#include <utility>
#include <vector>
#include "db/dbformat.h"
#include "rocksdb/comparator.h"
#include "rocksdb/options.h"
#include "rocksdb/perf_context.h"
#include "rocksdb/slice.h"
#include "rocksdb/statistics.h"
#include "table/iterator_wrapper.h"
#include "table/merging_iterator.h"
#include "test_util/sync_point.h"
#include "test_util/testharness.h"
#include "util/string_util.h"
#include "utilities/merge_operators.h"
namespace ROCKSDB_NAMESPACE {
static uint64_t TestGetTickerCount(const Options& options,
Tickers ticker_type) {
return options.statistics->getTickerCount(ticker_type);
}
class TestIterator : public InternalIterator {
public:
explicit TestIterator(const Comparator* comparator)
: initialized_(false),
valid_(false),
sequence_number_(0),
iter_(0),
cmp(comparator) {
data_.reserve(16);
}
void AddPut(std::string argkey, std::string argvalue) {
Add(argkey, kTypeValue, argvalue);
}
void AddTimedPut(std::string argkey, std::string argvalue,
uint64_t write_unix_time) {
std::string packed_value;
[[maybe_unused]] auto packed_value_slice =
PackValueAndWriteTime(argvalue, write_unix_time, &packed_value);
Add(argkey, kTypeValuePreferredSeqno, packed_value);
}
void AddDeletion(std::string argkey) {
Add(argkey, kTypeDeletion, std::string());
}
void AddSingleDeletion(std::string argkey) {
Add(argkey, kTypeSingleDeletion, std::string());
}
void AddMerge(std::string argkey, std::string argvalue) {
Add(argkey, kTypeMerge, argvalue);
}
void Add(std::string argkey, ValueType type, std::string argvalue) {
Add(argkey, type, argvalue, sequence_number_++);
}
void Add(std::string argkey, ValueType type, std::string argvalue,
size_t seq_num, bool update_iter = false) {
valid_ = true;
ParsedInternalKey internal_key(argkey, seq_num, type);
data_.emplace_back(std::string(), argvalue);
AppendInternalKey(&data_.back().first, internal_key);
if (update_iter && valid_ && cmp.Compare(data_.back().first, key()) < 0) {
// insert a key smaller than current key
Finish();
// data_[iter_] is not anymore the current element of the iterator.
// Increment it to reposition it to the right position.
iter_++;
}
}
// should be called before operations with iterator
void Finish() {
initialized_ = true;
std::sort(data_.begin(), data_.end(),
[this](std::pair<std::string, std::string> a,
std::pair<std::string, std::string> b) {
return (cmp.Compare(a.first, b.first) < 0);
});
}
// Removes the key from the set of keys over which this iterator iterates.
// Not to be confused with AddDeletion().
// If the iterator is currently positioned on this key, the deletion will
// apply next time the iterator moves.
// Used for simulating ForwardIterator updating to a new version that doesn't
// have some of the keys (e.g. after compaction with a filter).
void Vanish(std::string _key) {
if (valid_ && data_[iter_].first == _key) {
delete_current_ = true;
return;
}
for (auto it = data_.begin(); it != data_.end(); ++it) {
ParsedInternalKey ikey;
Status pik_status =
ParseInternalKey(it->first, &ikey, true /* log_err_key */);
pik_status.PermitUncheckedError();
assert(pik_status.ok());
if (!pik_status.ok() || ikey.user_key != _key) {
continue;
}
if (valid_ && data_.begin() + iter_ > it) {
--iter_;
}
data_.erase(it);
return;
}
assert(false);
}
// Number of operations done on this iterator since construction.
size_t steps() const { return steps_; }
bool Valid() const override {
assert(initialized_);
return valid_;
}
void SeekToFirst() override {
assert(initialized_);
++steps_;
DeleteCurrentIfNeeded();
valid_ = (data_.size() > 0);
iter_ = 0;
}
void SeekToLast() override {
assert(initialized_);
++steps_;
DeleteCurrentIfNeeded();
valid_ = (data_.size() > 0);
iter_ = data_.size() - 1;
}
void Seek(const Slice& target) override {
assert(initialized_);
SeekToFirst();
++steps_;
if (!valid_) {
return;
}
while (iter_ < data_.size() &&
(cmp.Compare(data_[iter_].first, target) < 0)) {
++iter_;
}
if (iter_ == data_.size()) {
valid_ = false;
}
}
void SeekForPrev(const Slice& target) override {
assert(initialized_);
DeleteCurrentIfNeeded();
SeekForPrevImpl(target, &cmp);
}
void Next() override {
assert(initialized_);
assert(valid_);
assert(iter_ < data_.size());
++steps_;
if (delete_current_) {
DeleteCurrentIfNeeded();
} else {
++iter_;
}
valid_ = iter_ < data_.size();
}
void Prev() override {
assert(initialized_);
assert(valid_);
assert(iter_ < data_.size());
++steps_;
DeleteCurrentIfNeeded();
if (iter_ == 0) {
valid_ = false;
} else {
--iter_;
}
}
Slice key() const override {
assert(initialized_);
return data_[iter_].first;
}
Slice value() const override {
assert(initialized_);
return data_[iter_].second;
}
Status status() const override {
assert(initialized_);
return Status::OK();
}
bool IsKeyPinned() const override { return true; }
bool IsValuePinned() const override { return true; }
private:
bool initialized_;
bool valid_;
size_t sequence_number_;
size_t iter_;
size_t steps_ = 0;
InternalKeyComparator cmp;
std::vector<std::pair<std::string, std::string>> data_;
bool delete_current_ = false;
void DeleteCurrentIfNeeded() {
if (!delete_current_) {
return;
}
data_.erase(data_.begin() + iter_);
delete_current_ = false;
}
};
class DBIteratorTest : public testing::Test {
public:
Env* env_;
DBIteratorTest() : env_(Env::Default()) {}
};
TEST_F(DBIteratorTest, DBIteratorPrevNext) {
Options options;
ImmutableOptions ioptions = ImmutableOptions(options);
MutableCFOptions mutable_cf_options = MutableCFOptions(options);
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddDeletion("a");
internal_iter->AddDeletion("a");
internal_iter->AddDeletion("a");
internal_iter->AddDeletion("a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->Finish();
ReadOptions ro;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "val_b");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "val_a");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "val_b");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
// Test to check the SeekToLast() with iterate_upper_bound not set
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
ReadOptions ro;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
}
// Test to check the SeekToLast() with iterate_upper_bound set
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("d", "val_d");
internal_iter->AddPut("e", "val_e");
internal_iter->AddPut("f", "val_f");
internal_iter->Finish();
Slice prefix("d");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
}
// Test to check the SeekToLast() iterate_upper_bound set to a key that
// is not Put yet
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("d", "val_d");
internal_iter->Finish();
Slice prefix("z");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
}
// Test to check the SeekToLast() with iterate_upper_bound set to the
// first key
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("b", "val_b");
internal_iter->Finish();
Slice prefix("a");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
// Test case to check SeekToLast with iterate_upper_bound set
// (same key put may times - SeekToLast should start with the
// maximum sequence id of the upper bound)
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
Slice prefix("c");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 7 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
SetPerfLevel(kEnableCount);
ASSERT_TRUE(GetPerfLevel() == kEnableCount);
get_perf_context()->Reset();
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(static_cast<int>(get_perf_context()->internal_key_skipped_count),
1);
ASSERT_EQ(db_iter->key().ToString(), "b");
SetPerfLevel(kDisable);
}
// Test to check the SeekToLast() with the iterate_upper_bound set
// (Checking the value of the key which has sequence ids greater than
// and less that the iterator's sequence id)
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a1");
internal_iter->AddPut("a", "val_a2");
internal_iter->AddPut("b", "val_b1");
internal_iter->AddPut("c", "val_c1");
internal_iter->AddPut("c", "val_c2");
internal_iter->AddPut("c", "val_c3");
internal_iter->AddPut("b", "val_b2");
internal_iter->AddPut("d", "val_d1");
internal_iter->Finish();
Slice prefix("c");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 4 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "val_b1");
}
// Test to check the SeekToLast() with the iterate_upper_bound set to the
// key that is deleted
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddDeletion("a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
Slice prefix("a");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
// Test to check the SeekToLast() with the iterate_upper_bound set
// (Deletion cases)
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddDeletion("b");
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
Slice prefix("c");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
}
// Test to check the SeekToLast() with iterate_upper_bound set
// (Deletion cases - Lot of internal keys after the upper_bound
// is deleted)
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddDeletion("c");
internal_iter->AddDeletion("d");
internal_iter->AddDeletion("e");
internal_iter->AddDeletion("f");
internal_iter->AddDeletion("g");
internal_iter->AddDeletion("h");
internal_iter->Finish();
Slice prefix("c");
ReadOptions ro;
ro.iterate_upper_bound = &prefix;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 7 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
SetPerfLevel(kEnableCount);
ASSERT_TRUE(GetPerfLevel() == kEnableCount);
get_perf_context()->Reset();
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(
static_cast<int>(get_perf_context()->internal_delete_skipped_count), 0);
ASSERT_EQ(db_iter->key().ToString(), "b");
SetPerfLevel(kDisable);
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddDeletion("a");
internal_iter->AddDeletion("a");
internal_iter->AddDeletion("a");
internal_iter->AddDeletion("a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->Finish();
ReadOptions ro;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToFirst();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "val_a");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "val_b");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "val_a");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->Finish();
ReadOptions ro;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 2 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "val_b");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "val_b");
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("a", "val_a");
internal_iter->AddPut("b", "val_b");
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
ReadOptions ro;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 10 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "val_c");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "val_b");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "val_c");
}
}
TEST_F(DBIteratorTest, DBIteratorEmpty) {
Options options;
ImmutableOptions ioptions = ImmutableOptions(options);
MutableCFOptions mutable_cf_options = MutableCFOptions(options);
ReadOptions ro;
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 0 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 0 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToFirst();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
}
TEST_F(DBIteratorTest, DBIteratorUseSkipCountSkips) {
ReadOptions ro;
Options options;
options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (size_t i = 0; i < 200; ++i) {
internal_iter->AddPut("a", "a");
internal_iter->AddPut("b", "b");
internal_iter->AddPut("c", "c");
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableOptions(options), MutableCFOptions(options),
BytewiseComparator(), internal_iter, nullptr /* version */,
2 /* sequence */, options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "c");
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 1u);
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "b");
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 2u);
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "a");
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 3u);
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
ASSERT_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 3u);
}
TEST_F(DBIteratorTest, DBIteratorUseSkip) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
ImmutableOptions ioptions = ImmutableOptions(options);
MutableCFOptions mutable_cf_options = MutableCFOptions(options);
{
for (size_t i = 0; i < 200; ++i) {
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("b", "merge_1");
internal_iter->AddMerge("a", "merge_2");
for (size_t k = 0; k < 200; ++k) {
internal_iter->AddPut("c", std::to_string(k));
}
internal_iter->Finish();
options.statistics = ROCKSDB_NAMESPACE::CreateDBStatistics();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, i + 2 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), std::to_string(i));
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_2");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
}
{
for (size_t i = 0; i < 200; ++i) {
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("b", "merge_1");
internal_iter->AddMerge("a", "merge_2");
for (size_t k = 0; k < 200; ++k) {
internal_iter->AddDeletion("c");
}
internal_iter->AddPut("c", "200");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, i + 2 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_2");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("b", "merge_1");
internal_iter->AddMerge("a", "merge_2");
for (size_t i = 0; i < 200; ++i) {
internal_iter->AddDeletion("c");
}
internal_iter->AddPut("c", "200");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 202 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "200");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_2");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
}
{
for (size_t i = 0; i < 200; ++i) {
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (size_t k = 0; k < 200; ++k) {
internal_iter->AddDeletion("c");
}
internal_iter->AddPut("c", "200");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, i /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
db_iter->SeekToFirst();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (size_t i = 0; i < 200; ++i) {
internal_iter->AddDeletion("c");
}
internal_iter->AddPut("c", "200");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, 200 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "200");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
db_iter->SeekToFirst();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "200");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
{
for (size_t i = 0; i < 200; ++i) {
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("b", "merge_1");
internal_iter->AddMerge("a", "merge_2");
for (size_t k = 0; k < 200; ++k) {
internal_iter->AddPut("d", std::to_string(k));
}
for (size_t k = 0; k < 200; ++k) {
internal_iter->AddPut("c", std::to_string(k));
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, i + 2 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
ASSERT_EQ(db_iter->value().ToString(), std::to_string(i));
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_2");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_OK(db_iter->status());
}
}
{
for (size_t i = 0; i < 200; ++i) {
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("b", "b");
internal_iter->AddMerge("a", "a");
for (size_t k = 0; k < 200; ++k) {
internal_iter->AddMerge("c", std::to_string(k));
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ioptions, mutable_cf_options, BytewiseComparator(),
internal_iter, nullptr /* version */, i + 2 /* sequence */,
options.max_sequential_skip_in_iterations,
nullptr /* read_callback */));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
std::string merge_result = "0";
for (size_t j = 1; j <= i; ++j) {
merge_result += "," + std::to_string(j);
}
ASSERT_EQ(db_iter->value().ToString(), merge_result);
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());