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5.14.fb
rocksdb/db/db_iter_test.cc
Siying Dong 6278420cd0 Fix regression bug of Prev() with upper bound (#3989) 
Summary:
A recent change pushed down the upper bound checking to child iterators. However, this causes the logic of following sequence wrong:
  Seek(key);
  if (!Valid()) SeekToLast();
Because !Valid() may be caused by upper bounds, rather than the end of the iterator. In this case SeekToLast() points to totally wrong places. This can cause wrong results, infinite loops, or segfault in some cases.
This sequence is called when changing direction from forward to backward. And this by itself also implicitly happen during reseeking optimization in Prev().

Fix this bug by using SeekForPrev() rather than this sequuence, as what is already done in prefix extrator case.
Closes https://github.com/facebook/rocksdb/pull/3989

Differential Revision: D8385422

Pulled By: siying

fbshipit-source-id: 429e869990cfd2dc389421e0836fc496bed67bb4
2018-06-12 17:03:28 -07:00

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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 <string>
#include <vector>
#include <algorithm>
#include <utility>
#include "db/db_iter.h"
#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 "util/string_util.h"
#include "util/sync_point.h"
#include "util/testharness.h"
#include "utilities/merge_operators.h"
namespace rocksdb {
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 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_.push_back(
std::pair<std::string, std::string>(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;
bool ok __attribute__((__unused__)) = ParseInternalKey(it->first, &ikey);
assert(ok);
if (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_; }
virtual bool Valid() const override {
assert(initialized_);
return valid_;
}
virtual void SeekToFirst() override {
assert(initialized_);
++steps_;
DeleteCurrentIfNeeded();
valid_ = (data_.size() > 0);
iter_ = 0;
}
virtual void SeekToLast() override {
assert(initialized_);
++steps_;
DeleteCurrentIfNeeded();
valid_ = (data_.size() > 0);
iter_ = data_.size() - 1;
}
virtual 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;
}
}
virtual void SeekForPrev(const Slice& target) override {
assert(initialized_);
DeleteCurrentIfNeeded();
SeekForPrevImpl(target, &cmp);
}
virtual void Next() override {
assert(initialized_);
assert(valid_);
assert(iter_ < data_.size());
++steps_;
if (delete_current_) {
DeleteCurrentIfNeeded();
} else {
++iter_;
}
valid_ = iter_ < data_.size();
}
virtual void Prev() override {
assert(initialized_);
assert(valid_);
assert(iter_ < data_.size());
++steps_;
DeleteCurrentIfNeeded();
if (iter_ == 0) {
valid_ = false;
} else {
--iter_;
}
}
virtual Slice key() const override {
assert(initialized_);
return data_[iter_].first;
}
virtual Slice value() const override {
assert(initialized_);
return data_[iter_].second;
}
virtual Status status() const override {
assert(initialized_);
return Status::OK();
}
virtual bool IsKeyPinned() const override { return true; }
virtual 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;
ImmutableCFOptions cf_options = ImmutableCFOptions(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, cf_options, BytewiseComparator(), internal_iter, 10,
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());
}
// 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, cf_options, BytewiseComparator(), internal_iter, 10,
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, cf_options, BytewiseComparator(), internal_iter, 10,
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, cf_options, BytewiseComparator(), internal_iter, 10,
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, cf_options, BytewiseComparator(), internal_iter, 10,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
}
// 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, cf_options, BytewiseComparator(), internal_iter, 7,
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, cf_options, BytewiseComparator(), internal_iter, 4,
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, cf_options, BytewiseComparator(), internal_iter, 10,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
}
// 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, cf_options, BytewiseComparator(), internal_iter, 10,
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, cf_options, BytewiseComparator(), internal_iter, 7,
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, cf_options, BytewiseComparator(), internal_iter, 10,
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());
}
{
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, cf_options, BytewiseComparator(), internal_iter, 2,
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, cf_options, BytewiseComparator(), internal_iter, 10,
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;
ImmutableCFOptions cf_options = ImmutableCFOptions(options);
ReadOptions ro;
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 0,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 0,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToFirst();
ASSERT_TRUE(!db_iter->Valid());
}
}
TEST_F(DBIteratorTest, DBIteratorUseSkipCountSkips) {
ReadOptions ro;
Options options;
options.statistics = rocksdb::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, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 2, 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_EQ(TestGetTickerCount(options, NUMBER_OF_RESEEKS_IN_ITERATION), 3u);
}
TEST_F(DBIteratorTest, DBIteratorUseSkip) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
ImmutableCFOptions cf_options = ImmutableCFOptions(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", ToString(k));
}
internal_iter->Finish();
options.statistics = rocksdb::CreateDBStatistics();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, i + 2,
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(), ToString(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());
}
}
{
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, cf_options, BytewiseComparator(), internal_iter, i + 2,
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());
}
{
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, cf_options, BytewiseComparator(), internal_iter, 202,
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());
}
}
{
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, cf_options, BytewiseComparator(), internal_iter, i,
options.max_sequential_skip_in_iterations,
nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
db_iter->SeekToFirst();
ASSERT_TRUE(!db_iter->Valid());
}
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, cf_options, BytewiseComparator(), internal_iter, 200,
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());
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());
}
{
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", ToString(k));
}
for (size_t k = 0; k < 200; ++k) {
internal_iter->AddPut("c", ToString(k));
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, i + 2,
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(), ToString(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());
}
}
{
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", ToString(k));
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, i + 2,
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 += "," + ToString(j);
}
ASSERT_EQ(db_iter->value().ToString(), merge_result);
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "b");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "a");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
}
}
TEST_F(DBIteratorTest, DBIteratorSkipInternalKeys) {
Options options;
ImmutableCFOptions cf_options = ImmutableCFOptions(options);
ReadOptions ro;
// Basic test case ... Make sure explicityly passing the default value works.
// Skipping internal keys is disabled by default, when the value is 0.
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("b");
internal_iter->AddPut("c", "val_c");
internal_iter->AddPut("c", "val_c");
internal_iter->AddDeletion("c");
internal_iter->AddPut("d", "val_d");
internal_iter->Finish();
ro.max_skippable_internal_keys = 0;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
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(), "d");
ASSERT_EQ(db_iter->value().ToString(), "val_d");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().ok());
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
ASSERT_EQ(db_iter->value().ToString(), "val_d");
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_TRUE(db_iter->status().ok());
}
// Test to make sure that the request will *not* fail as incomplete if
// num_internal_keys_skipped is *equal* to max_skippable_internal_keys
// threshold. (It will fail as incomplete only when the threshold is
// exceeded.)
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("b");
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
ro.max_skippable_internal_keys = 2;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
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(), "c");
ASSERT_EQ(db_iter->value().ToString(), "val_c");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().ok());
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_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "val_a");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().ok());
}
// Fail the request as incomplete when num_internal_keys_skipped >
// max_skippable_internal_keys
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("b");
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
ro.max_skippable_internal_keys = 2;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
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_TRUE(db_iter->status().IsIncomplete());
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_TRUE(db_iter->status().IsIncomplete());
}
// Test that the num_internal_keys_skipped counter resets after a successful
// read.
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("b");
internal_iter->AddPut("c", "val_c");
internal_iter->AddDeletion("d");
internal_iter->AddDeletion("d");
internal_iter->AddDeletion("d");
internal_iter->AddPut("e", "val_e");
internal_iter->Finish();
ro.max_skippable_internal_keys = 2;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
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(), "c");
ASSERT_EQ(db_iter->value().ToString(), "val_c");
db_iter->Next(); // num_internal_keys_skipped counter resets here.
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().IsIncomplete());
}
// Test that the num_internal_keys_skipped counter resets after a successful
// read.
// Reverse direction
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("b");
internal_iter->AddPut("c", "val_c");
internal_iter->AddDeletion("d");
internal_iter->AddDeletion("d");
internal_iter->AddPut("e", "val_e");
internal_iter->Finish();
ro.max_skippable_internal_keys = 2;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "e");
ASSERT_EQ(db_iter->value().ToString(), "val_e");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "val_c");
db_iter->Prev(); // num_internal_keys_skipped counter resets here.
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().IsIncomplete());
}
// Test that skipping separate keys is handled
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("c");
internal_iter->AddDeletion("d");
internal_iter->AddPut("e", "val_e");
internal_iter->Finish();
ro.max_skippable_internal_keys = 2;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
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_TRUE(db_iter->status().IsIncomplete());
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "e");
ASSERT_EQ(db_iter->value().ToString(), "val_e");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().IsIncomplete());
}
// Test if alternating puts and deletes of the same key are handled correctly.
{
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->AddDeletion("c");
internal_iter->AddPut("d", "val_d");
internal_iter->AddDeletion("d");
internal_iter->AddPut("e", "val_e");
internal_iter->Finish();
ro.max_skippable_internal_keys = 2;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
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_TRUE(db_iter->status().IsIncomplete());
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "e");
ASSERT_EQ(db_iter->value().ToString(), "val_e");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().IsIncomplete());
}
// Test for large number of skippable internal keys with *default*
// max_sequential_skip_in_iterations.
{
for (size_t i = 1; i <= 200; ++i) {
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
for (size_t j = 1; j <= i; ++j) {
internal_iter->AddPut("b", "val_b");
internal_iter->AddDeletion("b");
}
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
ro.max_skippable_internal_keys = i;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 2 * i + 1,
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();
if ((options.max_sequential_skip_in_iterations + 1) >=
ro.max_skippable_internal_keys) {
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().IsIncomplete());
} else {
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "val_c");
}
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();
if ((options.max_sequential_skip_in_iterations + 1) >=
ro.max_skippable_internal_keys) {
ASSERT_TRUE(!db_iter->Valid());
ASSERT_TRUE(db_iter->status().IsIncomplete());
} else {
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "val_a");
}
}
}
// Test for large number of skippable internal keys with a *non-default*
// max_sequential_skip_in_iterations.
{
for (size_t i = 1; i <= 200; ++i) {
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
for (size_t j = 1; j <= i; ++j) {
internal_iter->AddPut("b", "val_b");
internal_iter->AddDeletion("b");
}
internal_iter->AddPut("c", "val_c");
internal_iter->Finish();
options.max_sequential_skip_in_iterations = 1000;
ro.max_skippable_internal_keys = i;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 2 * i + 1,
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_TRUE(db_iter->status().IsIncomplete());
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_TRUE(db_iter->status().IsIncomplete());
}
}
}
TEST_F(DBIteratorTest, DBIterator1) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "0");
internal_iter->AddPut("b", "0");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("a", "1");
internal_iter->AddMerge("b", "2");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 1, 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(), "0");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
db_iter->Next();
ASSERT_FALSE(db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator2) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "0");
internal_iter->AddPut("b", "0");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("a", "1");
internal_iter->AddMerge("b", "2");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 0, 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(), "0");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator3) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "0");
internal_iter->AddPut("b", "0");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("a", "1");
internal_iter->AddMerge("b", "2");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 2, 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(), "0");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator4) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "0");
internal_iter->AddPut("b", "0");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("a", "1");
internal_iter->AddMerge("b", "2");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 4, 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(), "0,1");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "2");
db_iter->Next();
ASSERT_TRUE(!db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator5) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
ImmutableCFOptions cf_options = ImmutableCFOptions(options);
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddPut("a", "put_1");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 0,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddPut("a", "put_1");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 1,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1,merge_2");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddPut("a", "put_1");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 2,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1,merge_2,merge_3");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddPut("a", "put_1");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 3,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "put_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddPut("a", "put_1");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 4,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "put_1,merge_4");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddPut("a", "put_1");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 5,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "put_1,merge_4,merge_5");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddPut("a", "put_1");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 6,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "put_1,merge_4,merge_5,merge_6");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
// put, singledelete, merge
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "val_a");
internal_iter->AddSingleDeletion("a");
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddPut("b", "val_b");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 10,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->Seek("b");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
}
}
TEST_F(DBIteratorTest, DBIterator6) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
ImmutableCFOptions cf_options = ImmutableCFOptions(options);
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddDeletion("a");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 0,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddDeletion("a");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 1,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1,merge_2");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddDeletion("a");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 2,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1,merge_2,merge_3");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddDeletion("a");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 3,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddDeletion("a");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 4,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_4");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddDeletion("a");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 5,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_4,merge_5");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("a", "merge_3");
internal_iter->AddDeletion("a");
internal_iter->AddMerge("a", "merge_4");
internal_iter->AddMerge("a", "merge_5");
internal_iter->AddMerge("a", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 6,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_4,merge_5,merge_6");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
}
TEST_F(DBIteratorTest, DBIterator7) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
ImmutableCFOptions cf_options = ImmutableCFOptions(options);
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 0,
options.max_sequential_skip_in_iterations, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 2,
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,merge_2");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 4,
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_3");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 5,
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(), "merge_4");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_3");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 6,
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(), "merge_4,merge_5");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_3");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 7,
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(), "merge_4,merge_5");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 9,
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(), "merge_4,merge_5");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_6,merge_7");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 13,
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(), "merge_4,merge_5");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(),
"merge_6,merge_7,merge_8,merge_9,merge_10,merge_11");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddPut("b", "val");
internal_iter->AddMerge("b", "merge_2");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("c", "merge_4");
internal_iter->AddMerge("c", "merge_5");
internal_iter->AddDeletion("b");
internal_iter->AddMerge("b", "merge_6");
internal_iter->AddMerge("b", "merge_7");
internal_iter->AddMerge("b", "merge_8");
internal_iter->AddMerge("b", "merge_9");
internal_iter->AddMerge("b", "merge_10");
internal_iter->AddMerge("b", "merge_11");
internal_iter->AddDeletion("c");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, cf_options, BytewiseComparator(), internal_iter, 14,
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_6,merge_7,merge_8,merge_9,merge_10,merge_11");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1");
db_iter->Prev();
ASSERT_TRUE(!db_iter->Valid());
}
}
TEST_F(DBIteratorTest, DBIterator8) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddDeletion("a");
internal_iter->AddPut("a", "0");
internal_iter->AddPut("b", "0");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10, 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(), "0");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "0");
}
// TODO(3.13): fix the issue of Seek() then Prev() which might not necessary
// return the biggest element smaller than the seek key.
TEST_F(DBIteratorTest, DBIterator9) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
{
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddMerge("a", "merge_1");
internal_iter->AddMerge("a", "merge_2");
internal_iter->AddMerge("b", "merge_3");
internal_iter->AddMerge("b", "merge_4");
internal_iter->AddMerge("d", "merge_5");
internal_iter->AddMerge("d", "merge_6");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10, options.max_sequential_skip_in_iterations,
nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_3,merge_4");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
ASSERT_EQ(db_iter->value().ToString(), "merge_5,merge_6");
db_iter->Seek("b");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_3,merge_4");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "merge_1,merge_2");
db_iter->SeekForPrev("b");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_3,merge_4");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
ASSERT_EQ(db_iter->value().ToString(), "merge_5,merge_6");
db_iter->Seek("c");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
ASSERT_EQ(db_iter->value().ToString(), "merge_5,merge_6");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_3,merge_4");
db_iter->SeekForPrev("c");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "merge_3,merge_4");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
ASSERT_EQ(db_iter->value().ToString(), "merge_5,merge_6");
}
}
// TODO(3.13): fix the issue of Seek() then Prev() which might not necessary
// return the biggest element smaller than the seek key.
TEST_F(DBIteratorTest, DBIterator10) {
ReadOptions ro;
Options options;
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "1");
internal_iter->AddPut("b", "2");
internal_iter->AddPut("c", "3");
internal_iter->AddPut("d", "4");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10, options.max_sequential_skip_in_iterations,
nullptr /*read_callback*/));
db_iter->Seek("c");
ASSERT_TRUE(db_iter->Valid());
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "2");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "3");
db_iter->SeekForPrev("c");
ASSERT_TRUE(db_iter->Valid());
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "d");
ASSERT_EQ(db_iter->value().ToString(), "4");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "3");
}
TEST_F(DBIteratorTest, SeekToLastOccurrenceSeq0) {
ReadOptions ro;
Options options;
options.merge_operator = nullptr;
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "1");
internal_iter->AddPut("b", "2");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10, 0 /* force seek */, nullptr /*read_callback*/));
db_iter->SeekToFirst();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "1");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "2");
db_iter->Next();
ASSERT_FALSE(db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator11) {
ReadOptions ro;
Options options;
options.merge_operator = MergeOperators::CreateFromStringId("stringappend");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "0");
internal_iter->AddPut("b", "0");
internal_iter->AddSingleDeletion("b");
internal_iter->AddMerge("a", "1");
internal_iter->AddMerge("b", "2");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 1, 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(), "0");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
db_iter->Next();
ASSERT_FALSE(db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator12) {
ReadOptions ro;
Options options;
options.merge_operator = nullptr;
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "1");
internal_iter->AddPut("b", "2");
internal_iter->AddPut("c", "3");
internal_iter->AddSingleDeletion("b");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10, 0, nullptr /*read_callback*/));
db_iter->SeekToLast();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "c");
ASSERT_EQ(db_iter->value().ToString(), "3");
db_iter->Prev();
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "1");
db_iter->Prev();
ASSERT_FALSE(db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator13) {
ReadOptions ro;
Options options;
options.merge_operator = nullptr;
std::string key;
key.resize(9);
key.assign(9, static_cast<char>(0));
key[0] = 'b';
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut(key, "0");
internal_iter->AddPut(key, "1");
internal_iter->AddPut(key, "2");
internal_iter->AddPut(key, "3");
internal_iter->AddPut(key, "4");
internal_iter->AddPut(key, "5");
internal_iter->AddPut(key, "6");
internal_iter->AddPut(key, "7");
internal_iter->AddPut(key, "8");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 2, 3, nullptr /*read_callback*/));
db_iter->Seek("b");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), key);
ASSERT_EQ(db_iter->value().ToString(), "2");
}
TEST_F(DBIteratorTest, DBIterator14) {
ReadOptions ro;
Options options;
options.merge_operator = nullptr;
std::string key("b");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("b", "0");
internal_iter->AddPut("b", "1");
internal_iter->AddPut("b", "2");
internal_iter->AddPut("b", "3");
internal_iter->AddPut("a", "4");
internal_iter->AddPut("a", "5");
internal_iter->AddPut("a", "6");
internal_iter->AddPut("c", "7");
internal_iter->AddPut("c", "8");
internal_iter->AddPut("c", "9");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 4, 1, nullptr /*read_callback*/));
db_iter->Seek("b");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "3");
db_iter->SeekToFirst();
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "4");
}
TEST_F(DBIteratorTest, DBIteratorTestDifferentialSnapshots) {
{ // test that KVs earlier that iter_start_seqnum are filtered out
ReadOptions ro;
ro.iter_start_seqnum=5;
Options options;
options.statistics = rocksdb::CreateDBStatistics();
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (size_t i = 0; i < 10; ++i) {
internal_iter->AddPut(std::to_string(i), std::to_string(i) + "a");
internal_iter->AddPut(std::to_string(i), std::to_string(i) + "b");
internal_iter->AddPut(std::to_string(i), std::to_string(i) + "c");
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 13,
options.max_sequential_skip_in_iterations, nullptr));
// Expecting InternalKeys in [5,8] range with correct type
int seqnums[4] = {5,8,11,13};
std::string user_keys[4] = {"1","2","3","4"};
std::string values[4] = {"1c", "2c", "3c", "4b"};
int i = 0;
for (db_iter->SeekToFirst(); db_iter->Valid(); db_iter->Next()) {
FullKey fkey;
ParseFullKey(db_iter->key(), &fkey);
ASSERT_EQ(user_keys[i], fkey.user_key.ToString());
ASSERT_EQ(EntryType::kEntryPut, fkey.type);
ASSERT_EQ(seqnums[i], fkey.sequence);
ASSERT_EQ(values[i], db_iter->value().ToString());
i++;
}
ASSERT_EQ(i, 4);
}
{ // Test that deletes are returned correctly as internal KVs
ReadOptions ro;
ro.iter_start_seqnum=5;
Options options;
options.statistics = rocksdb::CreateDBStatistics();
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (size_t i = 0; i < 10; ++i) {
internal_iter->AddPut(std::to_string(i), std::to_string(i) + "a");
internal_iter->AddPut(std::to_string(i), std::to_string(i) + "b");
internal_iter->AddDeletion(std::to_string(i));
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 13,
options.max_sequential_skip_in_iterations, nullptr));
// Expecting InternalKeys in [5,8] range with correct type
int seqnums[4] = {5,8,11,13};
EntryType key_types[4] = {EntryType::kEntryDelete,EntryType::kEntryDelete,
EntryType::kEntryDelete,EntryType::kEntryPut};
std::string user_keys[4] = {"1","2","3","4"};
std::string values[4] = {"", "", "", "4b"};
int i = 0;
for (db_iter->SeekToFirst(); db_iter->Valid(); db_iter->Next()) {
FullKey fkey;
ParseFullKey(db_iter->key(), &fkey);
ASSERT_EQ(user_keys[i], fkey.user_key.ToString());
ASSERT_EQ(key_types[i], fkey.type);
ASSERT_EQ(seqnums[i], fkey.sequence);
ASSERT_EQ(values[i], db_iter->value().ToString());
i++;
}
ASSERT_EQ(i, 4);
}
}
class DBIterWithMergeIterTest : public testing::Test {
public:
DBIterWithMergeIterTest()
: env_(Env::Default()), icomp_(BytewiseComparator()) {
options_.merge_operator = nullptr;
internal_iter1_ = new TestIterator(BytewiseComparator());
internal_iter1_->Add("a", kTypeValue, "1", 3u);
internal_iter1_->Add("f", kTypeValue, "2", 5u);
internal_iter1_->Add("g", kTypeValue, "3", 7u);
internal_iter1_->Finish();
internal_iter2_ = new TestIterator(BytewiseComparator());
internal_iter2_->Add("a", kTypeValue, "4", 6u);
internal_iter2_->Add("b", kTypeValue, "5", 1u);
internal_iter2_->Add("c", kTypeValue, "6", 2u);
internal_iter2_->Add("d", kTypeValue, "7", 3u);
internal_iter2_->Finish();
std::vector<InternalIterator*> child_iters;
child_iters.push_back(internal_iter1_);
child_iters.push_back(internal_iter2_);
InternalKeyComparator icomp(BytewiseComparator());
InternalIterator* merge_iter =
NewMergingIterator(&icomp_, &child_iters[0], 2u);
db_iter_.reset(NewDBIterator(
env_, ro_, ImmutableCFOptions(options_), BytewiseComparator(),
merge_iter, 8 /* read data earlier than seqId 8 */,
3 /* max iterators before reseek */, nullptr /*read_callback*/));
}
Env* env_;
ReadOptions ro_;
Options options_;
TestIterator* internal_iter1_;
TestIterator* internal_iter2_;
InternalKeyComparator icomp_;
Iterator* merge_iter_;
std::unique_ptr<Iterator> db_iter_;
};
TEST_F(DBIterWithMergeIterTest, InnerMergeIterator1) {
db_iter_->SeekToFirst();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
db_iter_->Next();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Next();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Next();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Next();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
db_iter_->Next();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "g");
ASSERT_EQ(db_iter_->value().ToString(), "3");
db_iter_->Next();
ASSERT_FALSE(db_iter_->Valid());
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIterator2) {
// Test Prev() when one child iterator is at its end.
db_iter_->SeekForPrev("g");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "g");
ASSERT_EQ(db_iter_->value().ToString(), "3");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace1) {
// Test Prev() when one child iterator is at its end but more rows
// are added.
db_iter_->Seek("f");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
// Test call back inserts a key in the end of the mem table after
// MergeIterator::Prev() realized the mem table iterator is at its end
// and before an SeekToLast() is called.
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev",
[&](void* /*arg*/) { internal_iter2_->Add("z", kTypeValue, "7", 12u); });
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace2) {
// Test Prev() when one child iterator is at its end but more rows
// are added.
db_iter_->Seek("f");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
// Test call back inserts entries for update a key in the end of the
// mem table after MergeIterator::Prev() realized the mem tableiterator is at
// its end and before an SeekToLast() is called.
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev", [&](void* /*arg*/) {
internal_iter2_->Add("z", kTypeValue, "7", 12u);
internal_iter2_->Add("z", kTypeValue, "7", 11u);
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace3) {
// Test Prev() when one child iterator is at its end but more rows
// are added and max_skipped is triggered.
db_iter_->Seek("f");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
// Test call back inserts entries for update a key in the end of the
// mem table after MergeIterator::Prev() realized the mem table iterator is at
// its end and before an SeekToLast() is called.
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev", [&](void* /*arg*/) {
internal_iter2_->Add("z", kTypeValue, "7", 16u, true);
internal_iter2_->Add("z", kTypeValue, "7", 15u, true);
internal_iter2_->Add("z", kTypeValue, "7", 14u, true);
internal_iter2_->Add("z", kTypeValue, "7", 13u, true);
internal_iter2_->Add("z", kTypeValue, "7", 12u, true);
internal_iter2_->Add("z", kTypeValue, "7", 11u, true);
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace4) {
// Test Prev() when one child iterator has more rows inserted
// between Seek() and Prev() when changing directions.
internal_iter2_->Add("z", kTypeValue, "9", 4u);
db_iter_->Seek("g");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "g");
ASSERT_EQ(db_iter_->value().ToString(), "3");
// Test call back inserts entries for update a key before "z" in
// mem table after MergeIterator::Prev() calls mem table iterator's
// Seek() and before calling Prev()
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev", [&](void* arg) {
IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
if (it->key().starts_with("z")) {
internal_iter2_->Add("x", kTypeValue, "7", 16u, true);
internal_iter2_->Add("x", kTypeValue, "7", 15u, true);
internal_iter2_->Add("x", kTypeValue, "7", 14u, true);
internal_iter2_->Add("x", kTypeValue, "7", 13u, true);
internal_iter2_->Add("x", kTypeValue, "7", 12u, true);
internal_iter2_->Add("x", kTypeValue, "7", 11u, true);
}
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace5) {
internal_iter2_->Add("z", kTypeValue, "9", 4u);
// Test Prev() when one child iterator has more rows inserted
// between Seek() and Prev() when changing directions.
db_iter_->Seek("g");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "g");
ASSERT_EQ(db_iter_->value().ToString(), "3");
// Test call back inserts entries for update a key before "z" in
// mem table after MergeIterator::Prev() calls mem table iterator's
// Seek() and before calling Prev()
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev", [&](void* arg) {
IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
if (it->key().starts_with("z")) {
internal_iter2_->Add("x", kTypeValue, "7", 16u, true);
internal_iter2_->Add("x", kTypeValue, "7", 15u, true);
}
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace6) {
internal_iter2_->Add("z", kTypeValue, "9", 4u);
// Test Prev() when one child iterator has more rows inserted
// between Seek() and Prev() when changing directions.
db_iter_->Seek("g");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "g");
ASSERT_EQ(db_iter_->value().ToString(), "3");
// Test call back inserts an entry for update a key before "z" in
// mem table after MergeIterator::Prev() calls mem table iterator's
// Seek() and before calling Prev()
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev", [&](void* arg) {
IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
if (it->key().starts_with("z")) {
internal_iter2_->Add("x", kTypeValue, "7", 16u, true);
}
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace7) {
internal_iter1_->Add("u", kTypeValue, "10", 4u);
internal_iter1_->Add("v", kTypeValue, "11", 4u);
internal_iter1_->Add("w", kTypeValue, "12", 4u);
internal_iter2_->Add("z", kTypeValue, "9", 4u);
// Test Prev() when one child iterator has more rows inserted
// between Seek() and Prev() when changing directions.
db_iter_->Seek("g");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "g");
ASSERT_EQ(db_iter_->value().ToString(), "3");
// Test call back inserts entries for update a key before "z" in
// mem table after MergeIterator::Prev() calls mem table iterator's
// Seek() and before calling Prev()
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev", [&](void* arg) {
IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
if (it->key().starts_with("z")) {
internal_iter2_->Add("x", kTypeValue, "7", 16u, true);
internal_iter2_->Add("x", kTypeValue, "7", 15u, true);
internal_iter2_->Add("x", kTypeValue, "7", 14u, true);
internal_iter2_->Add("x", kTypeValue, "7", 13u, true);
internal_iter2_->Add("x", kTypeValue, "7", 12u, true);
internal_iter2_->Add("x", kTypeValue, "7", 11u, true);
}
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "c");
ASSERT_EQ(db_iter_->value().ToString(), "6");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "b");
ASSERT_EQ(db_iter_->value().ToString(), "5");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "a");
ASSERT_EQ(db_iter_->value().ToString(), "4");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIterWithMergeIterTest, InnerMergeIteratorDataRace8) {
// internal_iter1_: a, f, g
// internal_iter2_: a, b, c, d, adding (z)
internal_iter2_->Add("z", kTypeValue, "9", 4u);
// Test Prev() when one child iterator has more rows inserted
// between Seek() and Prev() when changing directions.
db_iter_->Seek("g");
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "g");
ASSERT_EQ(db_iter_->value().ToString(), "3");
// Test call back inserts two keys before "z" in mem table after
// MergeIterator::Prev() calls mem table iterator's Seek() and
// before calling Prev()
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"MergeIterator::Prev:BeforePrev", [&](void* arg) {
IteratorWrapper* it = reinterpret_cast<IteratorWrapper*>(arg);
if (it->key().starts_with("z")) {
internal_iter2_->Add("x", kTypeValue, "7", 16u, true);
internal_iter2_->Add("y", kTypeValue, "7", 17u, true);
}
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "f");
ASSERT_EQ(db_iter_->value().ToString(), "2");
db_iter_->Prev();
ASSERT_TRUE(db_iter_->Valid());
ASSERT_EQ(db_iter_->key().ToString(), "d");
ASSERT_EQ(db_iter_->value().ToString(), "7");
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DBIteratorTest, SeekPrefixTombstones) {
ReadOptions ro;
Options options;
options.prefix_extractor.reset(NewNoopTransform());
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddDeletion("b");
internal_iter->AddDeletion("c");
internal_iter->AddDeletion("d");
internal_iter->AddDeletion("e");
internal_iter->AddDeletion("f");
internal_iter->AddDeletion("g");
internal_iter->Finish();
ro.prefix_same_as_start = true;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10, options.max_sequential_skip_in_iterations,
nullptr /*read_callback*/));
int skipped_keys = 0;
get_perf_context()->Reset();
db_iter->SeekForPrev("z");
skipped_keys =
static_cast<int>(get_perf_context()->internal_key_skipped_count);
ASSERT_EQ(skipped_keys, 0);
get_perf_context()->Reset();
db_iter->Seek("a");
skipped_keys =
static_cast<int>(get_perf_context()->internal_key_skipped_count);
ASSERT_EQ(skipped_keys, 0);
}
TEST_F(DBIteratorTest, SeekToFirstLowerBound) {
const int kNumKeys = 3;
for (int i = 0; i < kNumKeys + 2; ++i) {
// + 2 for two special cases: lower bound before and lower bound after the
// internal iterator's keys
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (int j = 1; j <= kNumKeys; ++j) {
internal_iter->AddPut(std::to_string(j), "val");
}
internal_iter->Finish();
ReadOptions ro;
auto lower_bound_str = std::to_string(i);
Slice lower_bound(lower_bound_str);
ro.iterate_lower_bound = &lower_bound;
Options options;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10 /* sequence */,
options.max_sequential_skip_in_iterations, nullptr /* read_callback */));
db_iter->SeekToFirst();
if (i == kNumKeys + 1) {
// lower bound was beyond the last key
ASSERT_FALSE(db_iter->Valid());
} else {
ASSERT_TRUE(db_iter->Valid());
int expected;
if (i == 0) {
// lower bound was before the first key
expected = 1;
} else {
// lower bound was at the ith key
expected = i;
}
ASSERT_EQ(std::to_string(expected), db_iter->key().ToString());
}
}
}
TEST_F(DBIteratorTest, PrevLowerBound) {
const int kNumKeys = 3;
const int kLowerBound = 2;
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (int j = 1; j <= kNumKeys; ++j) {
internal_iter->AddPut(std::to_string(j), "val");
}
internal_iter->Finish();
ReadOptions ro;
auto lower_bound_str = std::to_string(kLowerBound);
Slice lower_bound(lower_bound_str);
ro.iterate_lower_bound = &lower_bound;
Options options;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10 /* sequence */,
options.max_sequential_skip_in_iterations, nullptr /* read_callback */));
db_iter->SeekToLast();
for (int i = kNumKeys; i >= kLowerBound; --i) {
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(std::to_string(i), db_iter->key().ToString());
db_iter->Prev();
}
ASSERT_FALSE(db_iter->Valid());
}
TEST_F(DBIteratorTest, SeekLessLowerBound) {
const int kNumKeys = 3;
const int kLowerBound = 2;
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
for (int j = 1; j <= kNumKeys; ++j) {
internal_iter->AddPut(std::to_string(j), "val");
}
internal_iter->Finish();
ReadOptions ro;
auto lower_bound_str = std::to_string(kLowerBound);
Slice lower_bound(lower_bound_str);
ro.iterate_lower_bound = &lower_bound;
Options options;
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ro, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10 /* sequence */,
options.max_sequential_skip_in_iterations, nullptr /* read_callback */));
auto before_lower_bound_str = std::to_string(kLowerBound - 1);
Slice before_lower_bound(lower_bound_str);
db_iter->Seek(before_lower_bound);
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(lower_bound_str, db_iter->key().ToString());
}
TEST_F(DBIteratorTest, ReverseToForwardWithDisappearingKeys) {
Options options;
options.prefix_extractor.reset(NewCappedPrefixTransform(0));
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("a", "A");
internal_iter->AddPut("b", "B");
for (int i = 0; i < 100; ++i) {
internal_iter->AddPut("c" + ToString(i), "");
}
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(NewDBIterator(
env_, ReadOptions(), ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 10, options.max_sequential_skip_in_iterations,
nullptr /*read_callback*/));
db_iter->SeekForPrev("a");
ASSERT_TRUE(db_iter->Valid());
ASSERT_OK(db_iter->status());
ASSERT_EQ("a", db_iter->key().ToString());
internal_iter->Vanish("a");
db_iter->Next();
ASSERT_TRUE(db_iter->Valid());
ASSERT_OK(db_iter->status());
ASSERT_EQ("b", db_iter->key().ToString());
// A (sort of) bug used to cause DBIter to pointlessly drag the internal
// iterator all the way to the end. But this doesn't really matter at the time
// of writing because the only iterator that can see disappearing keys is
// ForwardIterator, which doesn't support SeekForPrev().
EXPECT_LT(internal_iter->steps(), 20);
}
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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