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73fd589b1a
rocksdb/db/blob/blob_file_reader_test.cc
Levi Tamasi dc5de45af8 Support readahead during compaction for blob files (#9187) 
Summary:
The patch adds a new BlobDB configuration option `blob_compaction_readahead_size`
that can be used to enable prefetching data from blob files during compaction.
This is important when using storage with higher latencies like HDDs or remote filesystems.
If enabled, prefetching is used for all cases when blobs are read during compaction,
namely garbage collection, compaction filters (when the existing value has to be read from
a blob file), and `Merge` (when the value of the base `Put` is stored in a blob file).

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9187

Test Plan: Ran `make check` and the stress/crash test.

Reviewed By: riversand963

Differential Revision: D32565512

Pulled By: ltamasi

fbshipit-source-id: 87be9cebc3aa01cc227bec6b5f64d827b8164f5d
2021-11-19 17:53:47 -08:00

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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 "db/blob/blob_file_reader.h"
#include <cassert>
#include <string>
#include "db/blob/blob_log_format.h"
#include "db/blob/blob_log_writer.h"
#include "env/mock_env.h"
#include "file/filename.h"
#include "file/read_write_util.h"
#include "file/writable_file_writer.h"
#include "options/cf_options.h"
#include "rocksdb/env.h"
#include "rocksdb/file_system.h"
#include "rocksdb/options.h"
#include "test_util/sync_point.h"
#include "test_util/testharness.h"
#include "util/compression.h"
#include "utilities/fault_injection_env.h"
namespace ROCKSDB_NAMESPACE {
namespace {
// Creates a test blob file with `num` blobs in it.
void WriteBlobFile(const ImmutableOptions& immutable_options,
uint32_t column_family_id, bool has_ttl,
const ExpirationRange& expiration_range_header,
const ExpirationRange& expiration_range_footer,
uint64_t blob_file_number, const std::vector<Slice>& keys,
const std::vector<Slice>& blobs, CompressionType compression,
std::vector<uint64_t>& blob_offsets,
std::vector<uint64_t>& blob_sizes) {
assert(!immutable_options.cf_paths.empty());
size_t num = keys.size();
assert(num == blobs.size());
assert(num == blob_offsets.size());
assert(num == blob_sizes.size());
const std::string blob_file_path =
BlobFileName(immutable_options.cf_paths.front().path, blob_file_number);
std::unique_ptr<FSWritableFile> file;
ASSERT_OK(NewWritableFile(immutable_options.fs.get(), blob_file_path, &file,
FileOptions()));
std::unique_ptr<WritableFileWriter> file_writer(new WritableFileWriter(
std::move(file), blob_file_path, FileOptions(), immutable_options.clock));
constexpr Statistics* statistics = nullptr;
constexpr bool use_fsync = false;
constexpr bool do_flush = false;
BlobLogWriter blob_log_writer(std::move(file_writer), immutable_options.clock,
statistics, blob_file_number, use_fsync,
do_flush);
BlobLogHeader header(column_family_id, compression, has_ttl,
expiration_range_header);
ASSERT_OK(blob_log_writer.WriteHeader(header));
std::vector<std::string> compressed_blobs(num);
std::vector<Slice> blobs_to_write(num);
if (kNoCompression == compression) {
for (size_t i = 0; i < num; ++i) {
blobs_to_write[i] = blobs[i];
blob_sizes[i] = blobs[i].size();
}
} else {
CompressionOptions opts;
CompressionContext context(compression);
constexpr uint64_t sample_for_compression = 0;
CompressionInfo info(opts, context, CompressionDict::GetEmptyDict(),
compression, sample_for_compression);
constexpr uint32_t compression_format_version = 2;
for (size_t i = 0; i < num; ++i) {
ASSERT_TRUE(CompressData(blobs[i], info, compression_format_version,
&compressed_blobs[i]));
blobs_to_write[i] = compressed_blobs[i];
blob_sizes[i] = compressed_blobs[i].size();
}
}
for (size_t i = 0; i < num; ++i) {
uint64_t key_offset = 0;
ASSERT_OK(blob_log_writer.AddRecord(keys[i], blobs_to_write[i], &key_offset,
&blob_offsets[i]));
}
BlobLogFooter footer;
footer.blob_count = num;
footer.expiration_range = expiration_range_footer;
std::string checksum_method;
std::string checksum_value;
ASSERT_OK(
blob_log_writer.AppendFooter(footer, &checksum_method, &checksum_value));
}
// Creates a test blob file with a single blob in it. Note: this method
// makes it possible to test various corner cases by allowing the caller
// to specify the contents of various blob file header/footer fields.
void WriteBlobFile(const ImmutableOptions& immutable_options,
uint32_t column_family_id, bool has_ttl,
const ExpirationRange& expiration_range_header,
const ExpirationRange& expiration_range_footer,
uint64_t blob_file_number, const Slice& key,
const Slice& blob, CompressionType compression,
uint64_t* blob_offset, uint64_t* blob_size) {
std::vector<Slice> keys{key};
std::vector<Slice> blobs{blob};
std::vector<uint64_t> blob_offsets{0};
std::vector<uint64_t> blob_sizes{0};
WriteBlobFile(immutable_options, column_family_id, has_ttl,
expiration_range_header, expiration_range_footer,
blob_file_number, keys, blobs, compression, blob_offsets,
blob_sizes);
if (blob_offset) {
*blob_offset = blob_offsets[0];
}
if (blob_size) {
*blob_size = blob_sizes[0];
}
}
} // anonymous namespace
class BlobFileReaderTest : public testing::Test {
protected:
BlobFileReaderTest() { mock_env_.reset(MockEnv::Create(Env::Default())); }
std::unique_ptr<Env> mock_env_;
};
TEST_F(BlobFileReaderTest, CreateReaderAndGetBlob) {
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(),
"BlobFileReaderTest_CreateReaderAndGetBlob"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr size_t num_blobs = 3;
const std::vector<std::string> key_strs = {"key1", "key2", "key3"};
const std::vector<std::string> blob_strs = {"blob1", "blob2", "blob3"};
const std::vector<Slice> keys = {key_strs[0], key_strs[1], key_strs[2]};
const std::vector<Slice> blobs = {blob_strs[0], blob_strs[1], blob_strs[2]};
std::vector<uint64_t> blob_offsets(keys.size());
std::vector<uint64_t> blob_sizes(keys.size());
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, keys, blobs, kNoCompression,
blob_offsets, blob_sizes);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_OK(BlobFileReader::Create(
immutable_options, FileOptions(), column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/, &reader));
// Make sure the blob can be retrieved with and without checksum verification
ReadOptions read_options;
read_options.verify_checksums = false;
constexpr FilePrefetchBuffer* prefetch_buffer = nullptr;
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_OK(reader->GetBlob(read_options, keys[0], blob_offsets[0],
blob_sizes[0], kNoCompression, prefetch_buffer,
&value, &bytes_read));
ASSERT_EQ(value, blobs[0]);
ASSERT_EQ(bytes_read, blob_sizes[0]);
// MultiGetBlob
bytes_read = 0;
size_t total_size = 0;
autovector<std::reference_wrapper<const Slice>> key_refs;
for (const auto& key_ref : keys) {
key_refs.emplace_back(std::cref(key_ref));
}
autovector<uint64_t> offsets{blob_offsets[0], blob_offsets[1],
blob_offsets[2]};
autovector<uint64_t> sizes{blob_sizes[0], blob_sizes[1], blob_sizes[2]};
std::array<Status, num_blobs> statuses_buf;
autovector<Status*> statuses{&statuses_buf[0], &statuses_buf[1],
&statuses_buf[2]};
std::array<PinnableSlice, num_blobs> value_buf;
autovector<PinnableSlice*> values{&value_buf[0], &value_buf[1],
&value_buf[2]};
reader->MultiGetBlob(read_options, key_refs, offsets, sizes, statuses,
values, &bytes_read);
for (size_t i = 0; i < num_blobs; ++i) {
ASSERT_OK(statuses_buf[i]);
ASSERT_EQ(value_buf[i], blobs[i]);
total_size += blob_sizes[i];
}
ASSERT_EQ(bytes_read, total_size);
}
read_options.verify_checksums = true;
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_OK(reader->GetBlob(read_options, keys[1], blob_offsets[1],
blob_sizes[1], kNoCompression, prefetch_buffer,
&value, &bytes_read));
ASSERT_EQ(value, blobs[1]);
const uint64_t key_size = keys[1].size();
ASSERT_EQ(bytes_read,
BlobLogRecord::CalculateAdjustmentForRecordHeader(key_size) +
blob_sizes[1]);
}
// Invalid offset (too close to start of file)
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(read_options, keys[0], blob_offsets[0] - 1,
blob_sizes[0], kNoCompression, prefetch_buffer,
&value, &bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
}
// Invalid offset (too close to end of file)
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(read_options, keys[2], blob_offsets[2] + 1,
blob_sizes[2], kNoCompression, prefetch_buffer,
&value, &bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
}
// Incorrect compression type
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(read_options, keys[0], blob_offsets[0],
blob_sizes[0], kZSTD, prefetch_buffer, &value,
&bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
}
// Incorrect key size
{
constexpr char shorter_key[] = "k";
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(read_options, shorter_key,
blob_offsets[0] -
(keys[0].size() - sizeof(shorter_key) + 1),
blob_sizes[0], kNoCompression, prefetch_buffer,
&value, &bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
// MultiGetBlob
autovector<std::reference_wrapper<const Slice>> key_refs;
for (const auto& key_ref : keys) {
key_refs.emplace_back(std::cref(key_ref));
}
Slice shorter_key_slice(shorter_key, sizeof(shorter_key) - 1);
key_refs[1] = std::cref(shorter_key_slice);
autovector<uint64_t> offsets{
blob_offsets[0],
blob_offsets[1] - (keys[1].size() - key_refs[1].get().size()),
blob_offsets[2]};
autovector<uint64_t> sizes{blob_sizes[0], blob_sizes[1], blob_sizes[2]};
std::array<Status, num_blobs> statuses_buf;
autovector<Status*> statuses{&statuses_buf[0], &statuses_buf[1],
&statuses_buf[2]};
std::array<PinnableSlice, num_blobs> value_buf;
autovector<PinnableSlice*> values{&value_buf[0], &value_buf[1],
&value_buf[2]};
reader->MultiGetBlob(read_options, key_refs, offsets, sizes, statuses,
values, &bytes_read);
for (size_t i = 0; i < num_blobs; ++i) {
if (i == 1) {
ASSERT_TRUE(statuses_buf[i].IsCorruption());
} else {
ASSERT_OK(statuses_buf[i]);
}
}
}
// Incorrect key
{
constexpr char incorrect_key[] = "foo1";
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(read_options, incorrect_key, blob_offsets[0],
blob_sizes[0], kNoCompression, prefetch_buffer,
&value, &bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
// MultiGetBlob
autovector<std::reference_wrapper<const Slice>> key_refs;
for (const auto& key_ref : keys) {
key_refs.emplace_back(std::cref(key_ref));
}
Slice wrong_key_slice(incorrect_key, sizeof(incorrect_key) - 1);
key_refs[2] = std::cref(wrong_key_slice);
autovector<uint64_t> offsets{blob_offsets[0], blob_offsets[1],
blob_offsets[2]};
autovector<uint64_t> sizes{blob_sizes[0], blob_sizes[1], blob_sizes[2]};
std::array<Status, num_blobs> statuses_buf;
autovector<Status*> statuses{&statuses_buf[0], &statuses_buf[1],
&statuses_buf[2]};
std::array<PinnableSlice, num_blobs> value_buf;
autovector<PinnableSlice*> values{&value_buf[0], &value_buf[1],
&value_buf[2]};
reader->MultiGetBlob(read_options, key_refs, offsets, sizes, statuses,
values, &bytes_read);
for (size_t i = 0; i < num_blobs; ++i) {
if (i == num_blobs - 1) {
ASSERT_TRUE(statuses_buf[i].IsCorruption());
} else {
ASSERT_OK(statuses_buf[i]);
}
}
}
// Incorrect value size
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(read_options, keys[1], blob_offsets[1],
blob_sizes[1] + 1, kNoCompression,
prefetch_buffer, &value, &bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
// MultiGetBlob
autovector<std::reference_wrapper<const Slice>> key_refs;
for (const auto& key_ref : keys) {
key_refs.emplace_back(std::cref(key_ref));
}
autovector<uint64_t> offsets{blob_offsets[0], blob_offsets[1],
blob_offsets[2]};
autovector<uint64_t> sizes{blob_sizes[0], blob_sizes[1] + 1, blob_sizes[2]};
std::array<Status, num_blobs> statuses_buf;
autovector<Status*> statuses{&statuses_buf[0], &statuses_buf[1],
&statuses_buf[2]};
std::array<PinnableSlice, num_blobs> value_buf;
autovector<PinnableSlice*> values{&value_buf[0], &value_buf[1],
&value_buf[2]};
reader->MultiGetBlob(read_options, key_refs, offsets, sizes, statuses,
values, &bytes_read);
for (size_t i = 0; i < num_blobs; ++i) {
if (i != 1) {
ASSERT_OK(statuses_buf[i]);
} else {
ASSERT_TRUE(statuses_buf[i].IsCorruption());
}
}
}
}
TEST_F(BlobFileReaderTest, Malformed) {
// Write a blob file consisting of nothing but a header, and make sure we
// detect the error when we open it for reading
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(), "BlobFileReaderTest_Malformed"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr uint64_t blob_file_number = 1;
{
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
const std::string blob_file_path =
BlobFileName(immutable_options.cf_paths.front().path, blob_file_number);
std::unique_ptr<FSWritableFile> file;
ASSERT_OK(NewWritableFile(immutable_options.fs.get(), blob_file_path, &file,
FileOptions()));
std::unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), blob_file_path, FileOptions(),
immutable_options.clock));
constexpr Statistics* statistics = nullptr;
constexpr bool use_fsync = false;
constexpr bool do_flush = false;
BlobLogWriter blob_log_writer(std::move(file_writer),
immutable_options.clock, statistics,
blob_file_number, use_fsync, do_flush);
BlobLogHeader header(column_family_id, kNoCompression, has_ttl,
expiration_range);
ASSERT_OK(blob_log_writer.WriteHeader(header));
}
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_TRUE(BlobFileReader::Create(immutable_options, FileOptions(),
column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/,
&reader)
.IsCorruption());
}
TEST_F(BlobFileReaderTest, TTL) {
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(), "BlobFileReaderTest_TTL"), 0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = true;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, key, blob, kNoCompression,
&blob_offset, &blob_size);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_TRUE(BlobFileReader::Create(immutable_options, FileOptions(),
column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/,
&reader)
.IsCorruption());
}
TEST_F(BlobFileReaderTest, ExpirationRangeInHeader) {
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(),
"BlobFileReaderTest_ExpirationRangeInHeader"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
const ExpirationRange expiration_range_header(
1, 2); // can be made constexpr when we adopt C++14
constexpr ExpirationRange expiration_range_footer;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl,
expiration_range_header, expiration_range_footer,
blob_file_number, key, blob, kNoCompression, &blob_offset,
&blob_size);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_TRUE(BlobFileReader::Create(immutable_options, FileOptions(),
column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/,
&reader)
.IsCorruption());
}
TEST_F(BlobFileReaderTest, ExpirationRangeInFooter) {
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(),
"BlobFileReaderTest_ExpirationRangeInFooter"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range_header;
const ExpirationRange expiration_range_footer(
1, 2); // can be made constexpr when we adopt C++14
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl,
expiration_range_header, expiration_range_footer,
blob_file_number, key, blob, kNoCompression, &blob_offset,
&blob_size);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_TRUE(BlobFileReader::Create(immutable_options, FileOptions(),
column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/,
&reader)
.IsCorruption());
}
TEST_F(BlobFileReaderTest, IncorrectColumnFamily) {
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(),
"BlobFileReaderTest_IncorrectColumnFamily"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, key, blob, kNoCompression,
&blob_offset, &blob_size);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
constexpr uint32_t incorrect_column_family_id = 2;
ASSERT_TRUE(BlobFileReader::Create(immutable_options, FileOptions(),
incorrect_column_family_id,
blob_file_read_hist, blob_file_number,
nullptr /*IOTracer*/, &reader)
.IsCorruption());
}
TEST_F(BlobFileReaderTest, BlobCRCError) {
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(), "BlobFileReaderTest_BlobCRCError"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, key, blob, kNoCompression,
&blob_offset, &blob_size);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_OK(BlobFileReader::Create(
immutable_options, FileOptions(), column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/, &reader));
SyncPoint::GetInstance()->SetCallBack(
"BlobFileReader::VerifyBlob:CheckBlobCRC", [](void* arg) {
BlobLogRecord* const record = static_cast<BlobLogRecord*>(arg);
assert(record);
record->blob_crc = 0xfaceb00c;
});
SyncPoint::GetInstance()->EnableProcessing();
constexpr FilePrefetchBuffer* prefetch_buffer = nullptr;
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(ReadOptions(), key, blob_offset, blob_size,
kNoCompression, prefetch_buffer, &value,
&bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
TEST_F(BlobFileReaderTest, Compression) {
if (!Snappy_Supported()) {
return;
}
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(), "BlobFileReaderTest_Compression"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, key, blob,
kSnappyCompression, &blob_offset, &blob_size);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_OK(BlobFileReader::Create(
immutable_options, FileOptions(), column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/, &reader));
// Make sure the blob can be retrieved with and without checksum verification
ReadOptions read_options;
read_options.verify_checksums = false;
constexpr FilePrefetchBuffer* prefetch_buffer = nullptr;
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_OK(reader->GetBlob(read_options, key, blob_offset, blob_size,
kSnappyCompression, prefetch_buffer, &value,
&bytes_read));
ASSERT_EQ(value, blob);
ASSERT_EQ(bytes_read, blob_size);
}
read_options.verify_checksums = true;
{
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_OK(reader->GetBlob(read_options, key, blob_offset, blob_size,
kSnappyCompression, prefetch_buffer, &value,
&bytes_read));
ASSERT_EQ(value, blob);
constexpr uint64_t key_size = sizeof(key) - 1;
ASSERT_EQ(bytes_read,
BlobLogRecord::CalculateAdjustmentForRecordHeader(key_size) +
blob_size);
}
}
TEST_F(BlobFileReaderTest, UncompressionError) {
if (!Snappy_Supported()) {
return;
}
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(),
"BlobFileReaderTest_UncompressionError"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, key, blob,
kSnappyCompression, &blob_offset, &blob_size);
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
ASSERT_OK(BlobFileReader::Create(
immutable_options, FileOptions(), column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/, &reader));
SyncPoint::GetInstance()->SetCallBack(
"BlobFileReader::UncompressBlobIfNeeded:TamperWithResult", [](void* arg) {
CacheAllocationPtr* const output =
static_cast<CacheAllocationPtr*>(arg);
assert(output);
output->reset();
});
SyncPoint::GetInstance()->EnableProcessing();
constexpr FilePrefetchBuffer* prefetch_buffer = nullptr;
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(ReadOptions(), key, blob_offset, blob_size,
kSnappyCompression, prefetch_buffer, &value,
&bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
class BlobFileReaderIOErrorTest
: public testing::Test,
public testing::WithParamInterface<std::string> {
protected:
BlobFileReaderIOErrorTest() : sync_point_(GetParam()) {
mock_env_.reset(MockEnv::Create(Env::Default()));
fault_injection_env_.reset(new FaultInjectionTestEnv(mock_env_.get()));
}
std::unique_ptr<Env> mock_env_;
std::unique_ptr<FaultInjectionTestEnv> fault_injection_env_;
std::string sync_point_;
};
INSTANTIATE_TEST_CASE_P(BlobFileReaderTest, BlobFileReaderIOErrorTest,
::testing::ValuesIn(std::vector<std::string>{
"BlobFileReader::OpenFile:GetFileSize",
"BlobFileReader::OpenFile:NewRandomAccessFile",
"BlobFileReader::ReadHeader:ReadFromFile",
"BlobFileReader::ReadFooter:ReadFromFile",
"BlobFileReader::GetBlob:ReadFromFile"}));
TEST_P(BlobFileReaderIOErrorTest, IOError) {
// Simulates an I/O error during the specified step
Options options;
options.env = fault_injection_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(fault_injection_env_.get(),
"BlobFileReaderIOErrorTest_IOError"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, key, blob, kNoCompression,
&blob_offset, &blob_size);
SyncPoint::GetInstance()->SetCallBack(sync_point_, [this](void* /* arg */) {
fault_injection_env_->SetFilesystemActive(false,
Status::IOError(sync_point_));
});
SyncPoint::GetInstance()->EnableProcessing();
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
const Status s = BlobFileReader::Create(
immutable_options, FileOptions(), column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/, &reader);
const bool fail_during_create =
(sync_point_ != "BlobFileReader::GetBlob:ReadFromFile");
if (fail_during_create) {
ASSERT_TRUE(s.IsIOError());
} else {
ASSERT_OK(s);
constexpr FilePrefetchBuffer* prefetch_buffer = nullptr;
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(ReadOptions(), key, blob_offset, blob_size,
kNoCompression, prefetch_buffer, &value,
&bytes_read)
.IsIOError());
ASSERT_EQ(bytes_read, 0);
}
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
class BlobFileReaderDecodingErrorTest
: public testing::Test,
public testing::WithParamInterface<std::string> {
protected:
BlobFileReaderDecodingErrorTest() : sync_point_(GetParam()) {
mock_env_.reset(MockEnv::Create(Env::Default()));
}
std::unique_ptr<Env> mock_env_;
std::string sync_point_;
};
INSTANTIATE_TEST_CASE_P(BlobFileReaderTest, BlobFileReaderDecodingErrorTest,
::testing::ValuesIn(std::vector<std::string>{
"BlobFileReader::ReadHeader:TamperWithResult",
"BlobFileReader::ReadFooter:TamperWithResult",
"BlobFileReader::GetBlob:TamperWithResult"}));
TEST_P(BlobFileReaderDecodingErrorTest, DecodingError) {
Options options;
options.env = mock_env_.get();
options.cf_paths.emplace_back(
test::PerThreadDBPath(mock_env_.get(),
"BlobFileReaderDecodingErrorTest_DecodingError"),
0);
options.enable_blob_files = true;
ImmutableOptions immutable_options(options);
constexpr uint32_t column_family_id = 1;
constexpr bool has_ttl = false;
constexpr ExpirationRange expiration_range;
constexpr uint64_t blob_file_number = 1;
constexpr char key[] = "key";
constexpr char blob[] = "blob";
uint64_t blob_offset = 0;
uint64_t blob_size = 0;
WriteBlobFile(immutable_options, column_family_id, has_ttl, expiration_range,
expiration_range, blob_file_number, key, blob, kNoCompression,
&blob_offset, &blob_size);
SyncPoint::GetInstance()->SetCallBack(sync_point_, [](void* arg) {
Slice* const slice = static_cast<Slice*>(arg);
assert(slice);
assert(!slice->empty());
slice->remove_prefix(1);
});
SyncPoint::GetInstance()->EnableProcessing();
constexpr HistogramImpl* blob_file_read_hist = nullptr;
std::unique_ptr<BlobFileReader> reader;
const Status s = BlobFileReader::Create(
immutable_options, FileOptions(), column_family_id, blob_file_read_hist,
blob_file_number, nullptr /*IOTracer*/, &reader);
const bool fail_during_create =
sync_point_ != "BlobFileReader::GetBlob:TamperWithResult";
if (fail_during_create) {
ASSERT_TRUE(s.IsCorruption());
} else {
ASSERT_OK(s);
constexpr FilePrefetchBuffer* prefetch_buffer = nullptr;
PinnableSlice value;
uint64_t bytes_read = 0;
ASSERT_TRUE(reader
->GetBlob(ReadOptions(), key, blob_offset, blob_size,
kNoCompression, prefetch_buffer, &value,
&bytes_read)
.IsCorruption());
ASSERT_EQ(bytes_read, 0);
}
SyncPoint::GetInstance()->DisableProcessing();
SyncPoint::GetInstance()->ClearAllCallBacks();
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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