rocksdb/util/file_reader_writer_test.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#include "util/file_reader_writer.h"
#include <algorithm>
#include <vector>
#include "util/random.h"
#include "util/testharness.h"
#include "util/testutil.h"
namespace rocksdb {
class WritableFileWriterTest : public testing::Test {};
const uint32_t kMb = 1 << 20;
TEST_F(WritableFileWriterTest, RangeSync) {
class FakeWF : public WritableFile {
public:
explicit FakeWF() : size_(0), last_synced_(0) {}
~FakeWF() {}
Status Append(const Slice& data) override {
size_ += data.size();
return Status::OK();
}
Refactor to support file_reader_writer on Windows. Summary. A change https://reviews.facebook.net/differential/diff/224721/ Has attempted to move common functionality out of platform dependent code to a new facility called file_reader_writer. This includes: - perf counters - Buffering - RateLimiting However, the change did not attempt to refactor Windows code. To mitigate, we introduce new quering interfaces such as UseOSBuffer(), GetRequiredBufferAlignment() and ReaderWriterForward() for pure forwarding where required. Introduce WritableFile got a new method Truncate(). This is to communicate to the file as to how much data it has on close. - When space is pre-allocated on Linux it is filled with zeros implicitly, no such thing exist on Windows so we must truncate file on close. - When operating in unbuffered mode the last page is filled with zeros but we still want to truncate. Previously, Close() would take care of it but now buffer management is shifted to the wrappers and the file has no idea about the file true size. This means that Close() on the wrapper level must always include Truncate() as well as wrapper __dtor should call Close() and against double Close(). Move buffered/unbuffered write logic to the wrapper. Utilize Aligned buffer class. Adjust tests and implement Truncate() where necessary. Come up with reasonable defaults for new virtual interfaces. Forward calls for RandomAccessReadAhead class to avoid double buffering and locking (double locking in unbuffered mode on WIndows).
2015-09-11 18:57:02 +02:00
virtual Status Truncate(uint64_t size) override {
return Status::OK();
}
Status Close() override {
EXPECT_GE(size_, last_synced_ + kMb);
EXPECT_LT(size_, last_synced_ + 2 * kMb);
// Make sure random writes generated enough writes.
EXPECT_GT(size_, 10 * kMb);
return Status::OK();
}
Status Flush() override { return Status::OK(); }
Status Sync() override { return Status::OK(); }
Status Fsync() override { return Status::OK(); }
void SetIOPriority(Env::IOPriority pri) override {}
uint64_t GetFileSize() override { return size_; }
void GetPreallocationStatus(size_t* block_size,
size_t* last_allocated_block) override {}
size_t GetUniqueId(char* id, size_t max_size) const override { return 0; }
Status InvalidateCache(size_t offset, size_t length) override {
return Status::OK();
}
protected:
Status Allocate(uint64_t offset, uint64_t len) override { return Status::OK(); }
Status RangeSync(uint64_t offset, uint64_t nbytes) override {
EXPECT_EQ(offset % 4096, 0u);
EXPECT_EQ(nbytes % 4096, 0u);
EXPECT_EQ(offset, last_synced_);
last_synced_ = offset + nbytes;
EXPECT_GE(size_, last_synced_ + kMb);
if (size_ > 2 * kMb) {
EXPECT_LT(size_, last_synced_ + 2 * kMb);
}
return Status::OK();
}
uint64_t size_;
uint64_t last_synced_;
};
EnvOptions env_options;
env_options.bytes_per_sync = kMb;
unique_ptr<FakeWF> wf(new FakeWF);
unique_ptr<WritableFileWriter> writer(
new WritableFileWriter(std::move(wf), env_options));
Random r(301);
std::unique_ptr<char[]> large_buf(new char[10 * kMb]);
for (int i = 0; i < 1000; i++) {
int skew_limit = (i < 700) ? 10 : 15;
uint32_t num = r.Skewed(skew_limit) * 100 + r.Uniform(100);
writer->Append(Slice(large_buf.get(), num));
// Flush in a chance of 1/10.
if (r.Uniform(10) == 0) {
writer->Flush();
}
}
writer->Close();
}
TEST_F(WritableFileWriterTest, IncrementalBuffer) {
class FakeWF : public WritableFile {
public:
explicit FakeWF(std::string* _file_data, bool _use_direct_io,
bool _no_flush)
: file_data_(_file_data),
use_direct_io_(_use_direct_io),
no_flush_(_no_flush) {}
~FakeWF() {}
Status Append(const Slice& data) override {
file_data_->append(data.data(), data.size());
size_ += data.size();
return Status::OK();
}
Status PositionedAppend(const Slice& data, uint64_t pos) override {
EXPECT_TRUE(pos % 512 == 0);
EXPECT_TRUE(data.size() % 512 == 0);
file_data_->resize(pos);
file_data_->append(data.data(), data.size());
size_ += data.size();
return Status::OK();
}
virtual Status Truncate(uint64_t size) override {
file_data_->resize(size);
return Status::OK();
}
Status Close() override { return Status::OK(); }
Status Flush() override { return Status::OK(); }
Status Sync() override { return Status::OK(); }
Status Fsync() override { return Status::OK(); }
void SetIOPriority(Env::IOPriority pri) override {}
uint64_t GetFileSize() override { return size_; }
void GetPreallocationStatus(size_t* block_size,
size_t* last_allocated_block) override {}
size_t GetUniqueId(char* id, size_t max_size) const override { return 0; }
Status InvalidateCache(size_t offset, size_t length) override {
return Status::OK();
}
bool use_direct_io() const override { return use_direct_io_; }
std::string* file_data_;
bool use_direct_io_;
bool no_flush_;
size_t size_ = 0;
};
Random r(301);
const int kNumAttempts = 50;
for (int attempt = 0; attempt < kNumAttempts; attempt++) {
bool no_flush = (attempt % 3 == 0);
EnvOptions env_options;
env_options.writable_file_max_buffer_size =
(attempt < kNumAttempts / 2) ? 512 * 1024 : 700 * 1024;
std::string actual;
unique_ptr<FakeWF> wf(new FakeWF(&actual, attempt % 2 == 1, no_flush));
unique_ptr<WritableFileWriter> writer(
new WritableFileWriter(std::move(wf), env_options));
std::string target;
for (int i = 0; i < 20; i++) {
uint32_t num = r.Skewed(16) * 100 + r.Uniform(100);
std::string random_string;
test::RandomString(&r, num, &random_string);
writer->Append(Slice(random_string.c_str(), num));
target.append(random_string.c_str(), num);
// In some attempts, flush in a chance of 1/10.
if (!no_flush && r.Uniform(10) == 0) {
writer->Flush();
}
}
writer->Flush();
writer->Close();
ASSERT_EQ(target.size(), actual.size());
ASSERT_EQ(target, actual);
}
}
#ifndef ROCKSDB_LITE
TEST_F(WritableFileWriterTest, AppendStatusReturn) {
class FakeWF : public WritableFile {
public:
explicit FakeWF() : use_direct_io_(false), io_error_(false) {}
virtual bool use_direct_io() const override { return use_direct_io_; }
Status Append(const Slice& data) override {
if (io_error_) {
return Status::IOError("Fake IO error");
}
return Status::OK();
}
Status PositionedAppend(const Slice& data, uint64_t) override {
if (io_error_) {
return Status::IOError("Fake IO error");
}
return Status::OK();
}
Status Close() override { return Status::OK(); }
Status Flush() override { return Status::OK(); }
Status Sync() override { return Status::OK(); }
void Setuse_direct_io(bool val) { use_direct_io_ = val; }
void SetIOError(bool val) { io_error_ = val; }
protected:
bool use_direct_io_;
bool io_error_;
};
unique_ptr<FakeWF> wf(new FakeWF());
wf->Setuse_direct_io(true);
unique_ptr<WritableFileWriter> writer(
new WritableFileWriter(std::move(wf), EnvOptions()));
ASSERT_OK(writer->Append(std::string(2 * kMb, 'a')));
// Next call to WritableFile::Append() should fail
dynamic_cast<FakeWF*>(writer->writable_file())->SetIOError(true);
ASSERT_NOK(writer->Append(std::string(2 * kMb, 'b')));
}
#endif
class ReadaheadRandomAccessFileTest
: public testing::Test,
public testing::WithParamInterface<size_t> {
public:
static std::vector<size_t> GetReadaheadSizeList() {
return {1lu << 12, 1lu << 16};
}
virtual void SetUp() override {
readahead_size_ = GetParam();
scratch_.reset(new char[2 * readahead_size_]);
ResetSourceStr();
}
ReadaheadRandomAccessFileTest() : control_contents_() {}
std::string Read(uint64_t offset, size_t n) {
Slice result;
test_read_holder_->Read(offset, n, &result, scratch_.get());
return std::string(result.data(), result.size());
}
void ResetSourceStr(const std::string& str = "") {
auto write_holder = std::unique_ptr<WritableFileWriter>(
test::GetWritableFileWriter(new test::StringSink(&control_contents_)));
write_holder->Append(Slice(str));
write_holder->Flush();
auto read_holder = std::unique_ptr<RandomAccessFile>(
new test::StringSource(control_contents_));
test_read_holder_ =
NewReadaheadRandomAccessFile(std::move(read_holder), readahead_size_);
}
size_t GetReadaheadSize() const { return readahead_size_; }
private:
size_t readahead_size_;
Slice control_contents_;
std::unique_ptr<RandomAccessFile> test_read_holder_;
std::unique_ptr<char[]> scratch_;
};
TEST_P(ReadaheadRandomAccessFileTest, EmptySourceStrTest) {
ASSERT_EQ("", Read(0, 1));
ASSERT_EQ("", Read(0, 0));
ASSERT_EQ("", Read(13, 13));
}
TEST_P(ReadaheadRandomAccessFileTest, SourceStrLenLessThanReadaheadSizeTest) {
std::string str = "abcdefghijklmnopqrs";
ResetSourceStr(str);
ASSERT_EQ(str.substr(3, 4), Read(3, 4));
ASSERT_EQ(str.substr(0, 3), Read(0, 3));
ASSERT_EQ(str, Read(0, str.size()));
ASSERT_EQ(str.substr(7, std::min(static_cast<int>(str.size()) - 7, 30)),
Read(7, 30));
ASSERT_EQ("", Read(100, 100));
}
TEST_P(ReadaheadRandomAccessFileTest,
SourceStrLenCanBeGreaterThanReadaheadSizeTest) {
Random rng(42);
for (int k = 0; k < 100; ++k) {
size_t strLen = k * GetReadaheadSize() +
rng.Uniform(static_cast<int>(GetReadaheadSize()));
std::string str =
test::RandomHumanReadableString(&rng, static_cast<int>(strLen));
ResetSourceStr(str);
for (int test = 1; test <= 100; ++test) {
size_t offset = rng.Uniform(static_cast<int>(strLen));
size_t n = rng.Uniform(static_cast<int>(GetReadaheadSize()));
ASSERT_EQ(str.substr(offset, std::min(n, str.size() - offset)),
Read(offset, n));
}
}
}
TEST_P(ReadaheadRandomAccessFileTest, NExceedReadaheadTest) {
Random rng(7);
size_t strLen = 4 * GetReadaheadSize() +
rng.Uniform(static_cast<int>(GetReadaheadSize()));
std::string str =
test::RandomHumanReadableString(&rng, static_cast<int>(strLen));
ResetSourceStr(str);
for (int test = 1; test <= 100; ++test) {
size_t offset = rng.Uniform(static_cast<int>(strLen));
size_t n =
GetReadaheadSize() + rng.Uniform(static_cast<int>(GetReadaheadSize()));
ASSERT_EQ(str.substr(offset, std::min(n, str.size() - offset)),
Read(offset, n));
}
}
INSTANTIATE_TEST_CASE_P(
EmptySourceStrTest, ReadaheadRandomAccessFileTest,
::testing::ValuesIn(ReadaheadRandomAccessFileTest::GetReadaheadSizeList()));
INSTANTIATE_TEST_CASE_P(
SourceStrLenLessThanReadaheadSizeTest, ReadaheadRandomAccessFileTest,
::testing::ValuesIn(ReadaheadRandomAccessFileTest::GetReadaheadSizeList()));
INSTANTIATE_TEST_CASE_P(
SourceStrLenCanBeGreaterThanReadaheadSizeTest,
ReadaheadRandomAccessFileTest,
::testing::ValuesIn(ReadaheadRandomAccessFileTest::GetReadaheadSizeList()));
INSTANTIATE_TEST_CASE_P(
NExceedReadaheadTest, ReadaheadRandomAccessFileTest,
::testing::ValuesIn(ReadaheadRandomAccessFileTest::GetReadaheadSizeList()));
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}