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rocksdb/db/corruption_test.cc

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef ROCKSDB_LITE
#include "rocksdb/db.h"
#include <inttypes.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "rocksdb/cache.h"
#include "rocksdb/env.h"
#include "rocksdb/table.h"
#include "rocksdb/write_batch.h"
#include "db/db_impl.h"
#include "db/filename.h"
#include "db/log_format.h"
#include "db/version_set.h"
#include "util/logging.h"
#include "util/testharness.h"
#include "util/testutil.h"
namespace rocksdb {
static const int kValueSize = 1000;
class CorruptionTest : public testing::Test {
public:
test::ErrorEnv env_;
std::string dbname_;
shared_ptr<Cache> tiny_cache_;
Options options_;
DB* db_;
CorruptionTest() {
tiny_cache_ = NewLRUCache(100);
options_.env = &env_;
dbname_ = test::TmpDir() + "/corruption_test";
DestroyDB(dbname_, options_);
db_ = nullptr;
options_.create_if_missing = true;
BlockBasedTableOptions table_options;
table_options.block_size_deviation = 0; // make unit test pass for now
options_.table_factory.reset(NewBlockBasedTableFactory(table_options));
Reopen();
options_.create_if_missing = false;
}
~CorruptionTest() {
delete db_;
DestroyDB(dbname_, Options());
}
void CloseDb() {
delete db_;
db_ = nullptr;
}
Status TryReopen(Options* options = nullptr) {
delete db_;
db_ = nullptr;
Options opt = (options ? *options : options_);
opt.env = &env_;
opt.arena_block_size = 4096;
BlockBasedTableOptions table_options;
table_options.block_cache = tiny_cache_;
table_options.block_size_deviation = 0;
opt.table_factory.reset(NewBlockBasedTableFactory(table_options));
return DB::Open(opt, dbname_, &db_);
}
void Reopen(Options* options = nullptr) {
ASSERT_OK(TryReopen(options));
}
void RepairDB() {
delete db_;
db_ = nullptr;
ASSERT_OK(::rocksdb::RepairDB(dbname_, options_));
}
void Build(int n, int flush_every = 0) {
std::string key_space, value_space;
WriteBatch batch;
for (int i = 0; i < n; i++) {
if (flush_every != 0 && i != 0 && i % flush_every == 0) {
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
dbi->TEST_FlushMemTable();
}
//if ((i % 100) == 0) fprintf(stderr, "@ %d of %d\n", i, n);
Slice key = Key(i, &key_space);
batch.Clear();
batch.Put(key, Value(i, &value_space));
ASSERT_OK(db_->Write(WriteOptions(), &batch));
}
}
void Check(int min_expected, int max_expected) {
uint64_t next_expected = 0;
uint64_t missed = 0;
int bad_keys = 0;
int bad_values = 0;
int correct = 0;
std::string value_space;
// Do not verify checksums. If we verify checksums then the
// db itself will raise errors because data is corrupted.
// Instead, we want the reads to be successful and this test
// will detect whether the appropriate corruptions have
// occurred.
Iterator* iter = db_->NewIterator(ReadOptions(false, true));
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
uint64_t key;
Slice in(iter->key());
if (!ConsumeDecimalNumber(&in, &key) ||
!in.empty() ||
key < next_expected) {
bad_keys++;
continue;
}
missed += (key - next_expected);
next_expected = key + 1;
if (iter->value() != Value(static_cast<int>(key), &value_space)) {
bad_values++;
} else {
correct++;
}
}
delete iter;
fprintf(stderr,
"expected=%d..%d; got=%d; bad_keys=%d; bad_values=%d; missed=%llu\n",
min_expected, max_expected, correct, bad_keys, bad_values,
static_cast<unsigned long long>(missed));
ASSERT_LE(min_expected, correct);
ASSERT_GE(max_expected, correct);
}
void CorruptFile(const std::string& fname, int offset, int bytes_to_corrupt) {
struct stat sbuf;
if (stat(fname.c_str(), &sbuf) != 0) {
const char* msg = strerror(errno);
ASSERT_TRUE(false) << fname << ": " << msg;
}
if (offset < 0) {
// Relative to end of file; make it absolute
if (-offset > sbuf.st_size) {
offset = 0;
} else {
offset = static_cast<int>(sbuf.st_size + offset);
}
}
if (offset > sbuf.st_size) {
offset = static_cast<int>(sbuf.st_size);
}
if (offset + bytes_to_corrupt > sbuf.st_size) {
bytes_to_corrupt = static_cast<int>(sbuf.st_size - offset);
}
// Do it
std::string contents;
Status s = ReadFileToString(Env::Default(), fname, &contents);
ASSERT_TRUE(s.ok()) << s.ToString();
for (int i = 0; i < bytes_to_corrupt; i++) {
contents[i + offset] ^= 0x80;
}
s = WriteStringToFile(Env::Default(), contents, fname);
ASSERT_TRUE(s.ok()) << s.ToString();
}
void Corrupt(FileType filetype, int offset, int bytes_to_corrupt) {
// Pick file to corrupt
std::vector<std::string> filenames;
ASSERT_OK(env_.GetChildren(dbname_, &filenames));
uint64_t number;
FileType type;
std::string fname;
int picked_number = -1;
for (size_t i = 0; i < filenames.size(); i++) {
if (ParseFileName(filenames[i], &number, &type) &&
type == filetype &&
static_cast<int>(number) > picked_number) { // Pick latest file
fname = dbname_ + "/" + filenames[i];
picked_number = static_cast<int>(number);
}
}
ASSERT_TRUE(!fname.empty()) << filetype;
CorruptFile(fname, offset, bytes_to_corrupt);
}
// corrupts exactly one file at level `level`. if no file found at level,
// asserts
void CorruptTableFileAtLevel(int level, int offset, int bytes_to_corrupt) {
std::vector<LiveFileMetaData> metadata;
db_->GetLiveFilesMetaData(&metadata);
for (const auto& m : metadata) {
if (m.level == level) {
CorruptFile(dbname_ + "/" + m.name, offset, bytes_to_corrupt);
return;
}
}
ASSERT_TRUE(false) << "no file found at level";
}
int Property(const std::string& name) {
std::string property;
int result;
if (db_->GetProperty(name, &property) &&
sscanf(property.c_str(), "%d", &result) == 1) {
return result;
} else {
return -1;
}
}
// Return the ith key
Slice Key(int i, std::string* storage) {
char buf[100];
snprintf(buf, sizeof(buf), "%016d", i);
storage->assign(buf, strlen(buf));
return Slice(*storage);
}
// Return the value to associate with the specified key
Slice Value(int k, std::string* storage) {
if (k == 0) {
// Ugh. Random seed of 0 used to produce no entropy. This code
// preserves the implementation that was in place when all of the
// magic values in this file were picked.
*storage = std::string(kValueSize, ' ');
return Slice(*storage);
} else {
Random r(k);
return test::RandomString(&r, kValueSize, storage);
}
}
};
TEST_F(CorruptionTest, Recovery) {
Build(100);
Check(100, 100);
#ifdef OS_WIN
// On Wndows OS Disk cache does not behave properly
// We do not call FlushBuffers on every Flush. If we do not close
// the log file prior to the corruption we end up with the first
// block not corrupted but only the second. However, under the debugger
// things work just fine but never pass when running normally
// For that reason people may want to run with unbuffered I/O. That option
// is not available for WAL though.
CloseDb();
#endif
Corrupt(kLogFile, 19, 1); // WriteBatch tag for first record
Corrupt(kLogFile, log::kBlockSize + 1000, 1); // Somewhere in second block
ASSERT_TRUE(!TryReopen().ok());
options_.paranoid_checks = false;
Reopen(&options_);
// The 64 records in the first two log blocks are completely lost.
Check(36, 36);
}
TEST_F(CorruptionTest, RecoverWriteError) {
env_.writable_file_error_ = true;
Status s = TryReopen();
ASSERT_TRUE(!s.ok());
}
TEST_F(CorruptionTest, NewFileErrorDuringWrite) {
// Do enough writing to force minor compaction
env_.writable_file_error_ = true;
const int num =
static_cast<int>(3 + (Options().write_buffer_size / kValueSize));
std::string value_storage;
Status s;
bool failed = false;
for (int i = 0; i < num; i++) {
WriteBatch batch;
batch.Put("a", Value(100, &value_storage));
s = db_->Write(WriteOptions(), &batch);
if (!s.ok()) {
failed = true;
}
ASSERT_TRUE(!failed || !s.ok());
}
ASSERT_TRUE(!s.ok());
ASSERT_GE(env_.num_writable_file_errors_, 1);
env_.writable_file_error_ = false;
Reopen();
}
TEST_F(CorruptionTest, TableFile) {
Build(100);
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
dbi->TEST_FlushMemTable();
dbi->TEST_CompactRange(0, nullptr, nullptr);
dbi->TEST_CompactRange(1, nullptr, nullptr);
Corrupt(kTableFile, 100, 1);
Check(99, 99);
}
TEST_F(CorruptionTest, TableFileIndexData) {
Options options;
// very big, we'll trigger flushes manually
options.write_buffer_size = 100 * 1024 * 1024;
Reopen(&options);
// build 2 tables, flush at 5000
Build(10000, 5000);
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
dbi->TEST_FlushMemTable();
// corrupt an index block of an entire file
Corrupt(kTableFile, -2000, 500);
Reopen();
// one full file should be readable, since only one was corrupted
// the other file should be fully non-readable, since index was corrupted
Check(5000, 5000);
}
TEST_F(CorruptionTest, MissingDescriptor) {
Build(1000);
RepairDB();
Reopen();
Check(1000, 1000);
}
TEST_F(CorruptionTest, SequenceNumberRecovery) {
ASSERT_OK(db_->Put(WriteOptions(), "foo", "v1"));
ASSERT_OK(db_->Put(WriteOptions(), "foo", "v2"));
ASSERT_OK(db_->Put(WriteOptions(), "foo", "v3"));
ASSERT_OK(db_->Put(WriteOptions(), "foo", "v4"));
ASSERT_OK(db_->Put(WriteOptions(), "foo", "v5"));
RepairDB();
Reopen();
std::string v;
ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
ASSERT_EQ("v5", v);
// Write something. If sequence number was not recovered properly,
// it will be hidden by an earlier write.
ASSERT_OK(db_->Put(WriteOptions(), "foo", "v6"));
ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
ASSERT_EQ("v6", v);
Reopen();
ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
ASSERT_EQ("v6", v);
}
TEST_F(CorruptionTest, CorruptedDescriptor) {
ASSERT_OK(db_->Put(WriteOptions(), "foo", "hello"));
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
dbi->TEST_FlushMemTable();
dbi->TEST_CompactRange(0, nullptr, nullptr);
Corrupt(kDescriptorFile, 0, 1000);
Status s = TryReopen();
ASSERT_TRUE(!s.ok());
RepairDB();
Reopen();
std::string v;
ASSERT_OK(db_->Get(ReadOptions(), "foo", &v));
ASSERT_EQ("hello", v);
}
TEST_F(CorruptionTest, CompactionInputError) {
Options options;
Reopen(&options);
Build(10);
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
dbi->TEST_FlushMemTable();
dbi->TEST_CompactRange(0, nullptr, nullptr);
dbi->TEST_CompactRange(1, nullptr, nullptr);
ASSERT_EQ(1, Property("rocksdb.num-files-at-level2"));
Corrupt(kTableFile, 100, 1);
Check(9, 9);
// Force compactions by writing lots of values
Build(10000);
Check(10000, 10000);
}
TEST_F(CorruptionTest, CompactionInputErrorParanoid) {
Options options;
options.paranoid_checks = true;
options.write_buffer_size = 131072;
options.max_write_buffer_number = 2;
Reopen(&options);
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
// Fill levels >= 1
for (int level = 1; level < dbi->NumberLevels(); level++) {
dbi->Put(WriteOptions(), "", "begin");
dbi->Put(WriteOptions(), "~", "end");
dbi->TEST_FlushMemTable();
for (int comp_level = 0; comp_level < dbi->NumberLevels() - level;
++comp_level) {
dbi->TEST_CompactRange(comp_level, nullptr, nullptr);
}
}
Reopen(&options);
dbi = reinterpret_cast<DBImpl*>(db_);
Build(10);
dbi->TEST_FlushMemTable();
dbi->TEST_WaitForCompact();
ASSERT_EQ(1, Property("rocksdb.num-files-at-level0"));
CorruptTableFileAtLevel(0, 100, 1);
Check(9, 9);
// Write must eventually fail because of corrupted table
Status s;
std::string tmp1, tmp2;
bool failed = false;
for (int i = 0; i < 10000; i++) {
s = db_->Put(WriteOptions(), Key(i, &tmp1), Value(i, &tmp2));
if (!s.ok()) {
failed = true;
}
// if one write failed, every subsequent write must fail, too
ASSERT_TRUE(!failed || !s.ok()) << "write did not fail in a corrupted db";
}
ASSERT_TRUE(!s.ok()) << "write did not fail in corrupted paranoid db";
}
TEST_F(CorruptionTest, UnrelatedKeys) {
Build(10);
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
dbi->TEST_FlushMemTable();
Corrupt(kTableFile, 100, 1);
std::string tmp1, tmp2;
ASSERT_OK(db_->Put(WriteOptions(), Key(1000, &tmp1), Value(1000, &tmp2)));
std::string v;
ASSERT_OK(db_->Get(ReadOptions(), Key(1000, &tmp1), &v));
ASSERT_EQ(Value(1000, &tmp2).ToString(), v);
dbi->TEST_FlushMemTable();
ASSERT_OK(db_->Get(ReadOptions(), Key(1000, &tmp1), &v));
ASSERT_EQ(Value(1000, &tmp2).ToString(), v);
}
TEST_F(CorruptionTest, FileSystemStateCorrupted) {
for (int iter = 0; iter < 2; ++iter) {
Options options;
options.paranoid_checks = true;
options.create_if_missing = true;
Reopen(&options);
Build(10);
ASSERT_OK(db_->Flush(FlushOptions()));
DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
std::vector<LiveFileMetaData> metadata;
dbi->GetLiveFilesMetaData(&metadata);
ASSERT_GT(metadata.size(), size_t(0));
std::string filename = dbname_ + metadata[0].name;
delete db_;
db_ = nullptr;
if (iter == 0) { // corrupt file size
unique_ptr<WritableFile> file;
env_.NewWritableFile(filename, &file, EnvOptions());
file->Append(Slice("corrupted sst"));
file.reset();
} else { // delete the file
env_.DeleteFile(filename);
}
Status x = TryReopen(&options);
ASSERT_TRUE(x.IsCorruption());
DestroyDB(dbname_, options_);
Reopen(&options);
}
}
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
#else
#include <stdio.h>
int main(int argc, char** argv) {
fprintf(stderr, "SKIPPED as RepairDB() is not supported in ROCKSDB_LITE\n");
return 0;
}
#endif // !ROCKSDB_LITE