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rocksdb/db/db_impl/db_impl_open.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).
//
// 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.
#include <cinttypes>
#include "db/builder.h"
#include "db/db_impl/db_impl.h"
#include "db/error_handler.h"
#include "db/periodic_work_scheduler.h"
#include "env/composite_env_wrapper.h"
#include "file/read_write_util.h"
#include "file/sst_file_manager_impl.h"
#include "file/writable_file_writer.h"
#include "monitoring/persistent_stats_history.h"
#include "options/options_helper.h"
#include "rocksdb/table.h"
#include "rocksdb/wal_filter.h"
#include "test_util/sync_point.h"
#include "util/rate_limiter.h"
namespace ROCKSDB_NAMESPACE {
Options SanitizeOptions(const std::string& dbname, const Options& src,
bool read_only) {
auto db_options = SanitizeOptions(dbname, DBOptions(src), read_only);
ImmutableDBOptions immutable_db_options(db_options);
auto cf_options =
SanitizeOptions(immutable_db_options, ColumnFamilyOptions(src));
return Options(db_options, cf_options);
}
DBOptions SanitizeOptions(const std::string& dbname, const DBOptions& src,
bool read_only) {
DBOptions result(src);
if (result.env == nullptr) {
result.env = Env::Default();
}
// result.max_open_files means an "infinite" open files.
if (result.max_open_files != -1) {
int max_max_open_files = port::GetMaxOpenFiles();
if (max_max_open_files == -1) {
max_max_open_files = 0x400000;
}
ClipToRange(&result.max_open_files, 20, max_max_open_files);
TEST_SYNC_POINT_CALLBACK("SanitizeOptions::AfterChangeMaxOpenFiles",
&result.max_open_files);
}
if (result.info_log == nullptr && !read_only) {
Status s = CreateLoggerFromOptions(dbname, result, &result.info_log);
if (!s.ok()) {
// No place suitable for logging
result.info_log = nullptr;
}
}
if (!result.write_buffer_manager) {
result.write_buffer_manager.reset(
new WriteBufferManager(result.db_write_buffer_size));
}
auto bg_job_limits = DBImpl::GetBGJobLimits(
result.max_background_flushes, result.max_background_compactions,
result.max_background_jobs, true /* parallelize_compactions */);
result.env->IncBackgroundThreadsIfNeeded(bg_job_limits.max_compactions,
Env::Priority::LOW);
result.env->IncBackgroundThreadsIfNeeded(bg_job_limits.max_flushes,
Env::Priority::HIGH);
if (result.rate_limiter.get() != nullptr) {
if (result.bytes_per_sync == 0) {
result.bytes_per_sync = 1024 * 1024;
}
}
if (result.delayed_write_rate == 0) {
if (result.rate_limiter.get() != nullptr) {
result.delayed_write_rate = result.rate_limiter->GetBytesPerSecond();
}
if (result.delayed_write_rate == 0) {
result.delayed_write_rate = 16 * 1024 * 1024;
}
}
if (result.WAL_ttl_seconds > 0 || result.WAL_size_limit_MB > 0) {
result.recycle_log_file_num = false;
}
if (result.recycle_log_file_num &&
(result.wal_recovery_mode ==
WALRecoveryMode::kTolerateCorruptedTailRecords ||
result.wal_recovery_mode == WALRecoveryMode::kPointInTimeRecovery ||
result.wal_recovery_mode == WALRecoveryMode::kAbsoluteConsistency)) {
// - kTolerateCorruptedTailRecords is inconsistent with recycle log file
// feature. WAL recycling expects recovery success upon encountering a
// corrupt record at the point where new data ends and recycled data
// remains at the tail. However, `kTolerateCorruptedTailRecords` must fail
// upon encountering any such corrupt record, as it cannot differentiate
// between this and a real corruption, which would cause committed updates
// to be truncated -- a violation of the recovery guarantee.
// - kPointInTimeRecovery and kAbsoluteConsistency are incompatible with
// recycle log file feature temporarily due to a bug found introducing a
// hole in the recovered data
// (https://github.com/facebook/rocksdb/pull/7252#issuecomment-673766236).
// Besides this bug, we believe the features are fundamentally compatible.
result.recycle_log_file_num = 0;
}
if (result.db_paths.size() == 0) {
result.db_paths.emplace_back(dbname, std::numeric_limits<uint64_t>::max());
} else if (result.wal_dir.empty()) {
// Use dbname as default
result.wal_dir = dbname;
}
if (!result.wal_dir.empty()) {
// If there is a wal_dir already set, check to see if the wal_dir is the
// same as the dbname AND the same as the db_path[0] (which must exist from
// a few lines ago). If the wal_dir matches both of these values, then clear
// the wal_dir value, which will make wal_dir == dbname. Most likely this
// condition was the result of reading an old options file where we forced
// wal_dir to be set (to dbname).
auto npath = NormalizePath(dbname + "/");
if (npath == NormalizePath(result.wal_dir + "/") &&
npath == NormalizePath(result.db_paths[0].path + "/")) {
result.wal_dir.clear();
}
}
if (!result.wal_dir.empty() && result.wal_dir.back() == '/') {
result.wal_dir = result.wal_dir.substr(0, result.wal_dir.size() - 1);
}
if (result.use_direct_reads && result.compaction_readahead_size == 0) {
TEST_SYNC_POINT_CALLBACK("SanitizeOptions:direct_io", nullptr);
result.compaction_readahead_size = 1024 * 1024 * 2;
}
if (result.compaction_readahead_size > 0 || result.use_direct_reads) {
result.new_table_reader_for_compaction_inputs = true;
}
// Force flush on DB open if 2PC is enabled, since with 2PC we have no
// guarantee that consecutive log files have consecutive sequence id, which
// make recovery complicated.
if (result.allow_2pc) {
result.avoid_flush_during_recovery = false;
}
#ifndef ROCKSDB_LITE
ImmutableDBOptions immutable_db_options(result);
if (!immutable_db_options.IsWalDirSameAsDBPath()) {
// Either the WAL dir and db_paths[0]/db_name are not the same, or we
// cannot tell for sure. In either case, assume they're different and
// explicitly cleanup the trash log files (bypass DeleteScheduler)
// Do this first so even if we end up calling
// DeleteScheduler::CleanupDirectory on the same dir later, it will be
// safe
std::vector<std::string> filenames;
auto wal_dir = immutable_db_options.GetWalDir();
Status s = result.env->GetChildren(wal_dir, &filenames);
s.PermitUncheckedError(); //**TODO: What to do on error?
for (std::string& filename : filenames) {
if (filename.find(".log.trash", filename.length() -
std::string(".log.trash").length()) !=
std::string::npos) {
std::string trash_file = wal_dir + "/" + filename;
result.env->DeleteFile(trash_file).PermitUncheckedError();
}
}
}
// When the DB is stopped, it's possible that there are some .trash files that
// were not deleted yet, when we open the DB we will find these .trash files
// and schedule them to be deleted (or delete immediately if SstFileManager
// was not used)
auto sfm = static_cast<SstFileManagerImpl*>(result.sst_file_manager.get());
for (size_t i = 0; i < result.db_paths.size(); i++) {
DeleteScheduler::CleanupDirectory(result.env, sfm, result.db_paths[i].path)
.PermitUncheckedError();
}
// Create a default SstFileManager for purposes of tracking compaction size
// and facilitating recovery from out of space errors.
if (result.sst_file_manager.get() == nullptr) {
std::shared_ptr<SstFileManager> sst_file_manager(
NewSstFileManager(result.env, result.info_log));
result.sst_file_manager = sst_file_manager;
}
#endif // !ROCKSDB_LITE
if (!result.paranoid_checks) {
result.skip_checking_sst_file_sizes_on_db_open = true;
ROCKS_LOG_INFO(result.info_log,
"file size check will be skipped during open.");
}
return result;
}
namespace {
Status ValidateOptionsByTable(
const DBOptions& db_opts,
const std::vector<ColumnFamilyDescriptor>& column_families) {
Status s;
for (auto cf : column_families) {
s = ValidateOptions(db_opts, cf.options);
if (!s.ok()) {
return s;
}
}
return Status::OK();
}
} // namespace
Status DBImpl::ValidateOptions(
const DBOptions& db_options,
const std::vector<ColumnFamilyDescriptor>& column_families) {
Status s;
for (auto& cfd : column_families) {
s = ColumnFamilyData::ValidateOptions(db_options, cfd.options);
if (!s.ok()) {
return s;
}
}
s = ValidateOptions(db_options);
return s;
}
Status DBImpl::ValidateOptions(const DBOptions& db_options) {
if (db_options.db_paths.size() > 4) {
return Status::NotSupported(
"More than four DB paths are not supported yet. ");
}
if (db_options.allow_mmap_reads && db_options.use_direct_reads) {
// Protect against assert in PosixMMapReadableFile constructor
return Status::NotSupported(
"If memory mapped reads (allow_mmap_reads) are enabled "
"then direct I/O reads (use_direct_reads) must be disabled. ");
}
if (db_options.allow_mmap_writes &&
db_options.use_direct_io_for_flush_and_compaction) {
return Status::NotSupported(
"If memory mapped writes (allow_mmap_writes) are enabled "
"then direct I/O writes (use_direct_io_for_flush_and_compaction) must "
"be disabled. ");
}
if (db_options.keep_log_file_num == 0) {
return Status::InvalidArgument("keep_log_file_num must be greater than 0");
}
if (db_options.unordered_write &&
!db_options.allow_concurrent_memtable_write) {
return Status::InvalidArgument(
"unordered_write is incompatible with !allow_concurrent_memtable_write");
}
if (db_options.unordered_write && db_options.enable_pipelined_write) {
return Status::InvalidArgument(
"unordered_write is incompatible with enable_pipelined_write");
}
if (db_options.atomic_flush && db_options.enable_pipelined_write) {
return Status::InvalidArgument(
"atomic_flush is incompatible with enable_pipelined_write");
}
// TODO remove this restriction
if (db_options.atomic_flush && db_options.best_efforts_recovery) {
return Status::InvalidArgument(
"atomic_flush is currently incompatible with best-efforts recovery");
}
return Status::OK();
}
Status DBImpl::NewDB(std::vector<std::string>* new_filenames) {
VersionEdit new_db;
Status s = SetIdentityFile(env_, dbname_);
if (!s.ok()) {
return s;
}
if (immutable_db_options_.write_dbid_to_manifest) {
std::string temp_db_id;
GetDbIdentityFromIdentityFile(&temp_db_id);
new_db.SetDBId(temp_db_id);
}
new_db.SetLogNumber(0);
new_db.SetNextFile(2);
new_db.SetLastSequence(0);
ROCKS_LOG_INFO(immutable_db_options_.info_log, "Creating manifest 1 \n");
const std::string manifest = DescriptorFileName(dbname_, 1);
{
if (fs_->FileExists(manifest, IOOptions(), nullptr).ok()) {
fs_->DeleteFile(manifest, IOOptions(), nullptr).PermitUncheckedError();
}
std::unique_ptr<FSWritableFile> file;
FileOptions file_options = fs_->OptimizeForManifestWrite(file_options_);
s = NewWritableFile(fs_.get(), manifest, &file, file_options);
if (!s.ok()) {
return s;
}
FileTypeSet tmp_set = immutable_db_options_.checksum_handoff_file_types;
file->SetPreallocationBlockSize(
immutable_db_options_.manifest_preallocation_size);
std::unique_ptr<WritableFileWriter> file_writer(new WritableFileWriter(
std::move(file), manifest, file_options, immutable_db_options_.clock,
io_tracer_, nullptr /* stats */, immutable_db_options_.listeners,
nullptr, tmp_set.Contains(FileType::kDescriptorFile),
tmp_set.Contains(FileType::kDescriptorFile)));
log::Writer log(std::move(file_writer), 0, false);
std::string record;
new_db.EncodeTo(&record);
s = log.AddRecord(record);
if (s.ok()) {
s = SyncManifest(&immutable_db_options_, log.file());
}
}
if (s.ok()) {
// Make "CURRENT" file that points to the new manifest file.
s = SetCurrentFile(fs_.get(), dbname_, 1, directories_.GetDbDir());
if (new_filenames) {
new_filenames->emplace_back(
manifest.substr(manifest.find_last_of("/\\") + 1));
}
} else {
fs_->DeleteFile(manifest, IOOptions(), nullptr).PermitUncheckedError();
}
return s;
}
IOStatus DBImpl::CreateAndNewDirectory(
FileSystem* fs, const std::string& dirname,
std::unique_ptr<FSDirectory>* directory) {
// We call CreateDirIfMissing() as the directory may already exist (if we
// are reopening a DB), when this happens we don't want creating the
// directory to cause an error. However, we need to check if creating the
// directory fails or else we may get an obscure message about the lock
// file not existing. One real-world example of this occurring is if
// env->CreateDirIfMissing() doesn't create intermediate directories, e.g.
// when dbname_ is "dir/db" but when "dir" doesn't exist.
IOStatus io_s = fs->CreateDirIfMissing(dirname, IOOptions(), nullptr);
if (!io_s.ok()) {
return io_s;
}
return fs->NewDirectory(dirname, IOOptions(), directory, nullptr);
}
IOStatus Directories::SetDirectories(FileSystem* fs, const std::string& dbname,
const std::string& wal_dir,
const std::vector<DbPath>& data_paths) {
IOStatus io_s = DBImpl::CreateAndNewDirectory(fs, dbname, &db_dir_);
if (!io_s.ok()) {
return io_s;
}
if (!wal_dir.empty() && dbname != wal_dir) {
io_s = DBImpl::CreateAndNewDirectory(fs, wal_dir, &wal_dir_);
if (!io_s.ok()) {
return io_s;
}
}
data_dirs_.clear();
for (auto& p : data_paths) {
const std::string db_path = p.path;
if (db_path == dbname) {
data_dirs_.emplace_back(nullptr);
} else {
std::unique_ptr<FSDirectory> path_directory;
io_s = DBImpl::CreateAndNewDirectory(fs, db_path, &path_directory);
if (!io_s.ok()) {
return io_s;
}
data_dirs_.emplace_back(path_directory.release());
}
}
assert(data_dirs_.size() == data_paths.size());
return IOStatus::OK();
}
Status DBImpl::Recover(
const std::vector<ColumnFamilyDescriptor>& column_families, bool read_only,
bool error_if_wal_file_exists, bool error_if_data_exists_in_wals,
uint64_t* recovered_seq) {
mutex_.AssertHeld();
bool is_new_db = false;
assert(db_lock_ == nullptr);
std::vector<std::string> files_in_dbname;
if (!read_only) {
Status s = directories_.SetDirectories(fs_.get(), dbname_,
immutable_db_options_.wal_dir,
immutable_db_options_.db_paths);
if (!s.ok()) {
return s;
}
s = env_->LockFile(LockFileName(dbname_), &db_lock_);
if (!s.ok()) {
return s;
}
std::string current_fname = CurrentFileName(dbname_);
// Path to any MANIFEST file in the db dir. It does not matter which one.
// Since best-efforts recovery ignores CURRENT file, existence of a
// MANIFEST indicates the recovery to recover existing db. If no MANIFEST
// can be found, a new db will be created.
std::string manifest_path;
if (!immutable_db_options_.best_efforts_recovery) {
s = env_->FileExists(current_fname);
} else {
s = Status::NotFound();
Status io_s = env_->GetChildren(dbname_, &files_in_dbname);
if (!io_s.ok()) {
s = io_s;
files_in_dbname.clear();
}
for (const std::string& file : files_in_dbname) {
uint64_t number = 0;
FileType type = kWalFile; // initialize
if (ParseFileName(file, &number, &type) && type == kDescriptorFile) {
// Found MANIFEST (descriptor log), thus best-efforts recovery does
// not have to treat the db as empty.
s = Status::OK();
manifest_path = dbname_ + "/" + file;
break;
}
}
}
if (s.IsNotFound()) {
if (immutable_db_options_.create_if_missing) {
s = NewDB(&files_in_dbname);
is_new_db = true;
if (!s.ok()) {
return s;
}
} else {
return Status::InvalidArgument(
current_fname, "does not exist (create_if_missing is false)");
}
} else if (s.ok()) {
if (immutable_db_options_.error_if_exists) {
return Status::InvalidArgument(dbname_,
"exists (error_if_exists is true)");
}
} else {
// Unexpected error reading file
assert(s.IsIOError());
return s;
}
// Verify compatibility of file_options_ and filesystem
{
std::unique_ptr<FSRandomAccessFile> idfile;
FileOptions customized_fs(file_options_);
customized_fs.use_direct_reads |=
immutable_db_options_.use_direct_io_for_flush_and_compaction;
const std::string& fname =
manifest_path.empty() ? current_fname : manifest_path;
s = fs_->NewRandomAccessFile(fname, customized_fs, &idfile, nullptr);
if (!s.ok()) {
std::string error_str = s.ToString();
// Check if unsupported Direct I/O is the root cause
customized_fs.use_direct_reads = false;
s = fs_->NewRandomAccessFile(fname, customized_fs, &idfile, nullptr);
if (s.ok()) {
return Status::InvalidArgument(
"Direct I/O is not supported by the specified DB.");
} else {
return Status::InvalidArgument(
"Found options incompatible with filesystem", error_str.c_str());
}
}
}
} else if (immutable_db_options_.best_efforts_recovery) {
assert(files_in_dbname.empty());
Status s = env_->GetChildren(dbname_, &files_in_dbname);
if (s.IsNotFound()) {
return Status::InvalidArgument(dbname_,
"does not exist (open for read only)");
} else if (s.IsIOError()) {
return s;
}
assert(s.ok());
}
assert(db_id_.empty());
Status s;
bool missing_table_file = false;
if (!immutable_db_options_.best_efforts_recovery) {
s = versions_->Recover(column_families, read_only, &db_id_);
} else {
assert(!files_in_dbname.empty());
s = versions_->TryRecover(column_families, read_only, files_in_dbname,
&db_id_, &missing_table_file);
if (s.ok()) {
// TryRecover may delete previous column_family_set_.
column_family_memtables_.reset(
new ColumnFamilyMemTablesImpl(versions_->GetColumnFamilySet()));
}
}
if (!s.ok()) {
return s;
}
s = SetDBId(read_only);
if (s.ok() && !read_only) {
s = DeleteUnreferencedSstFiles();
}
if (immutable_db_options_.paranoid_checks && s.ok()) {
s = CheckConsistency();
}
if (s.ok() && !read_only) {
std::map<std::string, std::shared_ptr<FSDirectory>> created_dirs;
for (auto cfd : *versions_->GetColumnFamilySet()) {
s = cfd->AddDirectories(&created_dirs);
if (!s.ok()) {
return s;
}
}
}
// DB mutex is already held
if (s.ok() && immutable_db_options_.persist_stats_to_disk) {
s = InitPersistStatsColumnFamily();
}
std::vector<std::string> files_in_wal_dir;
if (s.ok()) {
// Initial max_total_in_memory_state_ before recovery wals. Log recovery
// may check this value to decide whether to flush.
max_total_in_memory_state_ = 0;
for (auto cfd : *versions_->GetColumnFamilySet()) {
auto* mutable_cf_options = cfd->GetLatestMutableCFOptions();
max_total_in_memory_state_ += mutable_cf_options->write_buffer_size *
mutable_cf_options->max_write_buffer_number;
}
SequenceNumber next_sequence(kMaxSequenceNumber);
default_cf_handle_ = new ColumnFamilyHandleImpl(
versions_->GetColumnFamilySet()->GetDefault(), this, &mutex_);
default_cf_internal_stats_ = default_cf_handle_->cfd()->internal_stats();
// TODO(Zhongyi): handle single_column_family_mode_ when
// persistent_stats is enabled
single_column_family_mode_ =
versions_->GetColumnFamilySet()->NumberOfColumnFamilies() == 1;
// Recover from all newer log files than the ones named in the
// descriptor (new log files may have been added by the previous
// incarnation without registering them in the descriptor).
//
// Note that prev_log_number() is no longer used, but we pay
// attention to it in case we are recovering a database
// produced by an older version of rocksdb.
auto wal_dir = immutable_db_options_.GetWalDir();
if (!immutable_db_options_.best_efforts_recovery) {
s = env_->GetChildren(wal_dir, &files_in_wal_dir);
}
if (s.IsNotFound()) {
return Status::InvalidArgument("wal_dir not found", wal_dir);
} else if (!s.ok()) {
return s;
}
std::unordered_map<uint64_t, std::string> wal_files;
for (const auto& file : files_in_wal_dir) {
uint64_t number;
FileType type;
if (ParseFileName(file, &number, &type) && type == kWalFile) {
if (is_new_db) {
return Status::Corruption(
"While creating a new Db, wal_dir contains "
"existing log file: ",
file);
} else {
wal_files[number] = LogFileName(wal_dir, number);
}
}
}
if (immutable_db_options_.track_and_verify_wals_in_manifest) {
if (!immutable_db_options_.best_efforts_recovery) {
// Verify WALs in MANIFEST.
s = versions_->GetWalSet().CheckWals(env_, wal_files);
} // else since best effort recovery does not recover from WALs, no need
// to check WALs.
} else if (!versions_->GetWalSet().GetWals().empty()) {
// Tracking is disabled, clear previously tracked WALs from MANIFEST,
// otherwise, in the future, if WAL tracking is enabled again,
// since the WALs deleted when WAL tracking is disabled are not persisted
// into MANIFEST, WAL check may fail.
VersionEdit edit;
WalNumber max_wal_number =
versions_->GetWalSet().GetWals().rbegin()->first;
edit.DeleteWalsBefore(max_wal_number + 1);
s = versions_->LogAndApplyToDefaultColumnFamily(&edit, &mutex_);
}
if (!s.ok()) {
return s;
}
if (!wal_files.empty()) {
if (error_if_wal_file_exists) {
return Status::Corruption(
"The db was opened in readonly mode with error_if_wal_file_exists"
"flag but a WAL file already exists");
} else if (error_if_data_exists_in_wals) {
for (auto& wal_file : wal_files) {
uint64_t bytes;
s = env_->GetFileSize(wal_file.second, &bytes);
if (s.ok()) {
if (bytes > 0) {
return Status::Corruption(
"error_if_data_exists_in_wals is set but there are data "
" in WAL files.");
}
}
}
}
}
if (!wal_files.empty()) {
// Recover in the order in which the wals were generated
std::vector<uint64_t> wals;
wals.reserve(wal_files.size());
for (const auto& wal_file : wal_files) {
wals.push_back(wal_file.first);
}
std::sort(wals.begin(), wals.end());
bool corrupted_wal_found = false;
s = RecoverLogFiles(wals, &next_sequence, read_only,
&corrupted_wal_found);
if (corrupted_wal_found && recovered_seq != nullptr) {
*recovered_seq = next_sequence;
}
if (!s.ok()) {
// Clear memtables if recovery failed
for (auto cfd : *versions_->GetColumnFamilySet()) {
cfd->CreateNewMemtable(*cfd->GetLatestMutableCFOptions(),
kMaxSequenceNumber);
}
}
}
}
if (read_only) {
// If we are opening as read-only, we need to update options_file_number_
// to reflect the most recent OPTIONS file. It does not matter for regular
// read-write db instance because options_file_number_ will later be
// updated to versions_->NewFileNumber() in RenameTempFileToOptionsFile.
std::vector<std::string> filenames;
if (s.ok()) {
const std::string normalized_dbname = NormalizePath(dbname_);
const std::string normalized_wal_dir =
NormalizePath(immutable_db_options_.GetWalDir());
if (immutable_db_options_.best_efforts_recovery) {
filenames = std::move(files_in_dbname);
} else if (normalized_dbname == normalized_wal_dir) {
filenames = std::move(files_in_wal_dir);
} else {
s = env_->GetChildren(GetName(), &filenames);
}
}
if (s.ok()) {
uint64_t number = 0;
uint64_t options_file_number = 0;
FileType type;
for (const auto& fname : filenames) {
if (ParseFileName(fname, &number, &type) && type == kOptionsFile) {
options_file_number = std::max(number, options_file_number);
}
}
versions_->options_file_number_ = options_file_number;
}
}
return s;
}
Status DBImpl::PersistentStatsProcessFormatVersion() {
mutex_.AssertHeld();
Status s;
// persist version when stats CF doesn't exist
bool should_persist_format_version = !persistent_stats_cfd_exists_;
mutex_.Unlock();
if (persistent_stats_cfd_exists_) {
// Check persistent stats format version compatibility. Drop and recreate
// persistent stats CF if format version is incompatible
uint64_t format_version_recovered = 0;
Status s_format = DecodePersistentStatsVersionNumber(
this, StatsVersionKeyType::kFormatVersion, &format_version_recovered);
uint64_t compatible_version_recovered = 0;
Status s_compatible = DecodePersistentStatsVersionNumber(
this, StatsVersionKeyType::kCompatibleVersion,
&compatible_version_recovered);
// abort reading from existing stats CF if any of following is true:
// 1. failed to read format version or compatible version from disk
// 2. sst's format version is greater than current format version, meaning
// this sst is encoded with a newer RocksDB release, and current compatible
// version is below the sst's compatible version
if (!s_format.ok() || !s_compatible.ok() ||
(kStatsCFCurrentFormatVersion < format_version_recovered &&
kStatsCFCompatibleFormatVersion < compatible_version_recovered)) {
if (!s_format.ok() || !s_compatible.ok()) {
ROCKS_LOG_WARN(
immutable_db_options_.info_log,
"Recreating persistent stats column family since reading "
"persistent stats version key failed. Format key: %s, compatible "
"key: %s",
s_format.ToString().c_str(), s_compatible.ToString().c_str());
} else {
ROCKS_LOG_WARN(
immutable_db_options_.info_log,
"Recreating persistent stats column family due to corrupted or "
"incompatible format version. Recovered format: %" PRIu64
"; recovered format compatible since: %" PRIu64 "\n",
format_version_recovered, compatible_version_recovered);
}
s = DropColumnFamily(persist_stats_cf_handle_);
if (s.ok()) {
s = DestroyColumnFamilyHandle(persist_stats_cf_handle_);
}
ColumnFamilyHandle* handle = nullptr;
if (s.ok()) {
ColumnFamilyOptions cfo;
OptimizeForPersistentStats(&cfo);
s = CreateColumnFamily(cfo, kPersistentStatsColumnFamilyName, &handle);
}
if (s.ok()) {
persist_stats_cf_handle_ = static_cast<ColumnFamilyHandleImpl*>(handle);
// should also persist version here because old stats CF is discarded
should_persist_format_version = true;
}
}
}
if (should_persist_format_version) {
// Persistent stats CF being created for the first time, need to write
// format version key
WriteBatch batch;
if (s.ok()) {
s = batch.Put(persist_stats_cf_handle_, kFormatVersionKeyString,
ToString(kStatsCFCurrentFormatVersion));
}
if (s.ok()) {
s = batch.Put(persist_stats_cf_handle_, kCompatibleVersionKeyString,
ToString(kStatsCFCompatibleFormatVersion));
}
if (s.ok()) {
WriteOptions wo;
wo.low_pri = true;
wo.no_slowdown = true;
wo.sync = false;
s = Write(wo, &batch);
}
}
mutex_.Lock();
return s;
}
Status DBImpl::InitPersistStatsColumnFamily() {
mutex_.AssertHeld();
assert(!persist_stats_cf_handle_);
ColumnFamilyData* persistent_stats_cfd =
versions_->GetColumnFamilySet()->GetColumnFamily(
kPersistentStatsColumnFamilyName);
persistent_stats_cfd_exists_ = persistent_stats_cfd != nullptr;
Status s;
if (persistent_stats_cfd != nullptr) {
// We are recovering from a DB which already contains persistent stats CF,
// the CF is already created in VersionSet::ApplyOneVersionEdit, but
// column family handle was not. Need to explicitly create handle here.
persist_stats_cf_handle_ =
new ColumnFamilyHandleImpl(persistent_stats_cfd, this, &mutex_);
} else {
mutex_.Unlock();
ColumnFamilyHandle* handle = nullptr;
ColumnFamilyOptions cfo;
OptimizeForPersistentStats(&cfo);
s = CreateColumnFamily(cfo, kPersistentStatsColumnFamilyName, &handle);
persist_stats_cf_handle_ = static_cast<ColumnFamilyHandleImpl*>(handle);
mutex_.Lock();
}
return s;
}
// REQUIRES: wal_numbers are sorted in ascending order
Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& wal_numbers,
SequenceNumber* next_sequence, bool read_only,
bool* corrupted_wal_found) {
struct LogReporter : public log::Reader::Reporter {
Env* env;
Logger* info_log;
const char* fname;
Status* status; // nullptr if immutable_db_options_.paranoid_checks==false
void Corruption(size_t bytes, const Status& s) override {
ROCKS_LOG_WARN(info_log, "%s%s: dropping %d bytes; %s",
(status == nullptr ? "(ignoring error) " : ""), fname,
static_cast<int>(bytes), s.ToString().c_str());
if (status != nullptr && status->ok()) {
*status = s;
}
}
};
mutex_.AssertHeld();
Status status;
std::unordered_map<int, VersionEdit> version_edits;
// no need to refcount because iteration is under mutex
for (auto cfd : *versions_->GetColumnFamilySet()) {
VersionEdit edit;
edit.SetColumnFamily(cfd->GetID());
version_edits.insert({cfd->GetID(), edit});
}
int job_id = next_job_id_.fetch_add(1);
{
auto stream = event_logger_.Log();
stream << "job" << job_id << "event"
<< "recovery_started";
stream << "wal_files";
stream.StartArray();
for (auto wal_number : wal_numbers) {
stream << wal_number;
}
stream.EndArray();
}
#ifndef ROCKSDB_LITE
if (immutable_db_options_.wal_filter != nullptr) {
std::map<std::string, uint32_t> cf_name_id_map;
std::map<uint32_t, uint64_t> cf_lognumber_map;
for (auto cfd : *versions_->GetColumnFamilySet()) {
cf_name_id_map.insert(std::make_pair(cfd->GetName(), cfd->GetID()));
cf_lognumber_map.insert(
std::make_pair(cfd->GetID(), cfd->GetLogNumber()));
}
immutable_db_options_.wal_filter->ColumnFamilyLogNumberMap(cf_lognumber_map,
cf_name_id_map);
}
#endif
bool stop_replay_by_wal_filter = false;
bool stop_replay_for_corruption = false;
bool flushed = false;
uint64_t corrupted_wal_number = kMaxSequenceNumber;
uint64_t min_wal_number = MinLogNumberToKeep();
for (auto wal_number : wal_numbers) {
if (wal_number < min_wal_number) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Skipping log #%" PRIu64
" since it is older than min log to keep #%" PRIu64,
wal_number, min_wal_number);
continue;
}
// The previous incarnation may not have written any MANIFEST
// records after allocating this log number. So we manually
// update the file number allocation counter in VersionSet.
versions_->MarkFileNumberUsed(wal_number);
// Open the log file
std::string fname =
LogFileName(immutable_db_options_.GetWalDir(), wal_number);
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Recovering log #%" PRIu64 " mode %d", wal_number,
static_cast<int>(immutable_db_options_.wal_recovery_mode));
auto logFileDropped = [this, &fname]() {
uint64_t bytes;
if (env_->GetFileSize(fname, &bytes).ok()) {
auto info_log = immutable_db_options_.info_log.get();
ROCKS_LOG_WARN(info_log, "%s: dropping %d bytes", fname.c_str(),
static_cast<int>(bytes));
}
};
if (stop_replay_by_wal_filter) {
logFileDropped();
continue;
}
std::unique_ptr<SequentialFileReader> file_reader;
{
std::unique_ptr<FSSequentialFile> file;
status = fs_->NewSequentialFile(fname,
fs_->OptimizeForLogRead(file_options_),
&file, nullptr);
if (!status.ok()) {
MaybeIgnoreError(&status);
if (!status.ok()) {
return status;
} else {
// Fail with one log file, but that's ok.
// Try next one.
continue;
}
}
file_reader.reset(new SequentialFileReader(
std::move(file), fname, immutable_db_options_.log_readahead_size,
io_tracer_));
}
// Create the log reader.
LogReporter reporter;
reporter.env = env_;
reporter.info_log = immutable_db_options_.info_log.get();
reporter.fname = fname.c_str();
if (!immutable_db_options_.paranoid_checks ||
immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kSkipAnyCorruptedRecords) {
reporter.status = nullptr;
} else {
reporter.status = &status;
}
// We intentially make log::Reader do checksumming even if
// paranoid_checks==false so that corruptions cause entire commits
// to be skipped instead of propagating bad information (like overly
// large sequence numbers).
log::Reader reader(immutable_db_options_.info_log, std::move(file_reader),
&reporter, true /*checksum*/, wal_number);
// Determine if we should tolerate incomplete records at the tail end of the
// Read all the records and add to a memtable
std::string scratch;
Slice record;
WriteBatch batch;
TEST_SYNC_POINT_CALLBACK("DBImpl::RecoverLogFiles:BeforeReadWal",
/*arg=*/nullptr);
while (!stop_replay_by_wal_filter &&
reader.ReadRecord(&record, &scratch,
immutable_db_options_.wal_recovery_mode) &&
status.ok()) {
if (record.size() < WriteBatchInternal::kHeader) {
reporter.Corruption(record.size(),
Status::Corruption("log record too small"));
continue;
}
status = WriteBatchInternal::SetContents(&batch, record);
if (!status.ok()) {
return status;
}
SequenceNumber sequence = WriteBatchInternal::Sequence(&batch);
if (immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kPointInTimeRecovery) {
// In point-in-time recovery mode, if sequence id of log files are
// consecutive, we continue recovery despite corruption. This could
// happen when we open and write to a corrupted DB, where sequence id
// will start from the last sequence id we recovered.
if (sequence == *next_sequence) {
stop_replay_for_corruption = false;
}
if (stop_replay_for_corruption) {
logFileDropped();
break;
}
}
#ifndef ROCKSDB_LITE
if (immutable_db_options_.wal_filter != nullptr) {
WriteBatch new_batch;
bool batch_changed = false;
WalFilter::WalProcessingOption wal_processing_option =
immutable_db_options_.wal_filter->LogRecordFound(
wal_number, fname, batch, &new_batch, &batch_changed);
switch (wal_processing_option) {
case WalFilter::WalProcessingOption::kContinueProcessing:
// do nothing, proceeed normally
break;
case WalFilter::WalProcessingOption::kIgnoreCurrentRecord:
// skip current record
continue;
case WalFilter::WalProcessingOption::kStopReplay:
// skip current record and stop replay
stop_replay_by_wal_filter = true;
continue;
case WalFilter::WalProcessingOption::kCorruptedRecord: {
status =
Status::Corruption("Corruption reported by Wal Filter ",
immutable_db_options_.wal_filter->Name());
MaybeIgnoreError(&status);
if (!status.ok()) {
reporter.Corruption(record.size(), status);
continue;
}
break;
}
default: {
assert(false); // unhandled case
status = Status::NotSupported(
"Unknown WalProcessingOption returned"
" by Wal Filter ",
immutable_db_options_.wal_filter->Name());
MaybeIgnoreError(&status);
if (!status.ok()) {
return status;
} else {
// Ignore the error with current record processing.
continue;
}
}
}
if (batch_changed) {
// Make sure that the count in the new batch is
// within the orignal count.
int new_count = WriteBatchInternal::Count(&new_batch);
int original_count = WriteBatchInternal::Count(&batch);
if (new_count > original_count) {
ROCKS_LOG_FATAL(
immutable_db_options_.info_log,
"Recovering log #%" PRIu64
" mode %d log filter %s returned "
"more records (%d) than original (%d) which is not allowed. "
"Aborting recovery.",
wal_number,
static_cast<int>(immutable_db_options_.wal_recovery_mode),
immutable_db_options_.wal_filter->Name(), new_count,
original_count);
status = Status::NotSupported(
"More than original # of records "
"returned by Wal Filter ",
immutable_db_options_.wal_filter->Name());
return status;
}
// Set the same sequence number in the new_batch
// as the original batch.
WriteBatchInternal::SetSequence(&new_batch,
WriteBatchInternal::Sequence(&batch));
batch = new_batch;
}
}
#endif // ROCKSDB_LITE
// If column family was not found, it might mean that the WAL write
// batch references to the column family that was dropped after the
// insert. We don't want to fail the whole write batch in that case --
// we just ignore the update.
// That's why we set ignore missing column families to true
bool has_valid_writes = false;
status = WriteBatchInternal::InsertInto(
&batch, column_family_memtables_.get(), &flush_scheduler_,
&trim_history_scheduler_, true, wal_number, this,
false /* concurrent_memtable_writes */, next_sequence,
&has_valid_writes, seq_per_batch_, batch_per_txn_);
MaybeIgnoreError(&status);
if (!status.ok()) {
// We are treating this as a failure while reading since we read valid
// blocks that do not form coherent data
reporter.Corruption(record.size(), status);
continue;
}
if (has_valid_writes && !read_only) {
// we can do this because this is called before client has access to the
// DB and there is only a single thread operating on DB
ColumnFamilyData* cfd;
while ((cfd = flush_scheduler_.TakeNextColumnFamily()) != nullptr) {
cfd->UnrefAndTryDelete();
// If this asserts, it means that InsertInto failed in
// filtering updates to already-flushed column families
assert(cfd->GetLogNumber() <= wal_number);
auto iter = version_edits.find(cfd->GetID());
assert(iter != version_edits.end());
VersionEdit* edit = &iter->second;
status = WriteLevel0TableForRecovery(job_id, cfd, cfd->mem(), edit);
if (!status.ok()) {
// Reflect errors immediately so that conditions like full
// file-systems cause the DB::Open() to fail.
return status;
}
flushed = true;
cfd->CreateNewMemtable(*cfd->GetLatestMutableCFOptions(),
*next_sequence);
}
}
}
if (!status.ok()) {
if (status.IsNotSupported()) {
// We should not treat NotSupported as corruption. It is rather a clear
// sign that we are processing a WAL that is produced by an incompatible
// version of the code.
return status;
}
if (immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kSkipAnyCorruptedRecords) {
// We should ignore all errors unconditionally
status = Status::OK();
} else if (immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kPointInTimeRecovery) {
if (status.IsIOError()) {
ROCKS_LOG_ERROR(immutable_db_options_.info_log,
"IOError during point-in-time reading log #%" PRIu64
" seq #%" PRIu64
". %s. This likely mean loss of synced WAL, "
"thus recovery fails.",
wal_number, *next_sequence,
status.ToString().c_str());
return status;
}
// We should ignore the error but not continue replaying
status = Status::OK();
stop_replay_for_corruption = true;
corrupted_wal_number = wal_number;
if (corrupted_wal_found != nullptr) {
*corrupted_wal_found = true;
}
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Point in time recovered to log #%" PRIu64
" seq #%" PRIu64,
wal_number, *next_sequence);
} else {
assert(immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kTolerateCorruptedTailRecords ||
immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kAbsoluteConsistency);
return status;
}
}
flush_scheduler_.Clear();
trim_history_scheduler_.Clear();
auto last_sequence = *next_sequence - 1;
if ((*next_sequence != kMaxSequenceNumber) &&
(versions_->LastSequence() <= last_sequence)) {
versions_->SetLastAllocatedSequence(last_sequence);
versions_->SetLastPublishedSequence(last_sequence);
versions_->SetLastSequence(last_sequence);
}
}
// Compare the corrupted log number to all columnfamily's current log number.
// Abort Open() if any column family's log number is greater than
// the corrupted log number, which means CF contains data beyond the point of
// corruption. This could during PIT recovery when the WAL is corrupted and
// some (but not all) CFs are flushed
// Exclude the PIT case where no log is dropped after the corruption point.
// This is to cover the case for empty wals after corrupted log, in which we
// don't reset stop_replay_for_corruption.
if (stop_replay_for_corruption == true &&
(immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kPointInTimeRecovery ||
immutable_db_options_.wal_recovery_mode ==
WALRecoveryMode::kTolerateCorruptedTailRecords)) {
for (auto cfd : *versions_->GetColumnFamilySet()) {
// One special case cause cfd->GetLogNumber() > corrupted_wal_number but
// the CF is still consistent: If a new column family is created during
// the flush and the WAL sync fails at the same time, the new CF points to
// the new WAL but the old WAL is curropted. Since the new CF is empty, it
// is still consistent. We add the check of CF sst file size to avoid the
// false positive alert.
// Note that, the check of (cfd->GetLiveSstFilesSize() > 0) may leads to
// the ignorance of a very rare inconsistency case caused in data
// canclation. One CF is empty due to KV deletion. But those operations
// are in the WAL. If the WAL is corrupted, the status of this CF might
// not be consistent with others. However, the consistency check will be
// bypassed due to empty CF.
// TODO: a better and complete implementation is needed to ensure strict
// consistency check in WAL recovery including hanlding the tailing
// issues.
if (cfd->GetLogNumber() > corrupted_wal_number &&
cfd->GetLiveSstFilesSize() > 0) {
ROCKS_LOG_ERROR(immutable_db_options_.info_log,
"Column family inconsistency: SST file contains data"
" beyond the point of corruption.");
return Status::Corruption("SST file is ahead of WALs in CF " +
cfd->GetName());
}
}
}
// True if there's any data in the WALs; if not, we can skip re-processing
// them later
bool data_seen = false;
if (!read_only) {
// no need to refcount since client still doesn't have access
// to the DB and can not drop column families while we iterate
const WalNumber max_wal_number = wal_numbers.back();
for (auto cfd : *versions_->GetColumnFamilySet()) {
auto iter = version_edits.find(cfd->GetID());
assert(iter != version_edits.end());
VersionEdit* edit = &iter->second;
if (cfd->GetLogNumber() > max_wal_number) {
// Column family cfd has already flushed the data
// from all wals. Memtable has to be empty because
// we filter the updates based on wal_number
// (in WriteBatch::InsertInto)
assert(cfd->mem()->GetFirstSequenceNumber() == 0);
assert(edit->NumEntries() == 0);
continue;
}
TEST_SYNC_POINT_CALLBACK(
"DBImpl::RecoverLogFiles:BeforeFlushFinalMemtable", /*arg=*/nullptr);
// flush the final memtable (if non-empty)
if (cfd->mem()->GetFirstSequenceNumber() != 0) {
// If flush happened in the middle of recovery (e.g. due to memtable
// being full), we flush at the end. Otherwise we'll need to record
// where we were on last flush, which make the logic complicated.
if (flushed || !immutable_db_options_.avoid_flush_during_recovery) {
status = WriteLevel0TableForRecovery(job_id, cfd, cfd->mem(), edit);
if (!status.ok()) {
// Recovery failed
break;
}
flushed = true;
cfd->CreateNewMemtable(*cfd->GetLatestMutableCFOptions(),
versions_->LastSequence());
}
data_seen = true;
}
// Update the log number info in the version edit corresponding to this
// column family. Note that the version edits will be written to MANIFEST
// together later.
// writing wal_number in the manifest means that any log file
// with number strongly less than (wal_number + 1) is already
// recovered and should be ignored on next reincarnation.
// Since we already recovered max_wal_number, we want all wals
// with numbers `<= max_wal_number` (includes this one) to be ignored
if (flushed || cfd->mem()->GetFirstSequenceNumber() == 0) {
edit->SetLogNumber(max_wal_number + 1);
}
}
if (status.ok()) {
// we must mark the next log number as used, even though it's
// not actually used. that is because VersionSet assumes
// VersionSet::next_file_number_ always to be strictly greater than any
// log number
versions_->MarkFileNumberUsed(max_wal_number + 1);
autovector<ColumnFamilyData*> cfds;
autovector<const MutableCFOptions*> cf_opts;
autovector<autovector<VersionEdit*>> edit_lists;
for (auto* cfd : *versions_->GetColumnFamilySet()) {
cfds.push_back(cfd);
cf_opts.push_back(cfd->GetLatestMutableCFOptions());
auto iter = version_edits.find(cfd->GetID());
assert(iter != version_edits.end());
edit_lists.push_back({&iter->second});
}
std::unique_ptr<VersionEdit> wal_deletion;
if (immutable_db_options_.track_and_verify_wals_in_manifest) {
wal_deletion.reset(new VersionEdit);
wal_deletion->DeleteWalsBefore(max_wal_number + 1);
edit_lists.back().push_back(wal_deletion.get());
}
// write MANIFEST with update
status = versions_->LogAndApply(cfds, cf_opts, edit_lists, &mutex_,
directories_.GetDbDir(),
/*new_descriptor_log=*/true);
}
}
if (status.ok()) {
if (data_seen && !flushed) {
status = RestoreAliveLogFiles(wal_numbers);
} else {
// If there's no data in the WAL, or we flushed all the data, still
// truncate the log file. If the process goes into a crash loop before
// the file is deleted, the preallocated space will never get freed.
const bool truncate = !read_only;
GetLogSizeAndMaybeTruncate(wal_numbers.back(), truncate, nullptr)
.PermitUncheckedError();
}
}
event_logger_.Log() << "job" << job_id << "event"
<< "recovery_finished";
return status;
}
Status DBImpl::GetLogSizeAndMaybeTruncate(uint64_t wal_number, bool truncate,
LogFileNumberSize* log_ptr) {
LogFileNumberSize log(wal_number);
std::string fname =
LogFileName(immutable_db_options_.GetWalDir(), wal_number);
Status s;
// This gets the appear size of the wals, not including preallocated space.
s = env_->GetFileSize(fname, &log.size);
if (s.ok() && truncate) {
std::unique_ptr<FSWritableFile> last_log;
Status truncate_status = fs_->ReopenWritableFile(
fname,
fs_->OptimizeForLogWrite(
file_options_,
BuildDBOptions(immutable_db_options_, mutable_db_options_)),
&last_log, nullptr);
if (truncate_status.ok()) {
truncate_status = last_log->Truncate(log.size, IOOptions(), nullptr);
}
if (truncate_status.ok()) {
truncate_status = last_log->Close(IOOptions(), nullptr);
}
// Not a critical error if fail to truncate.
if (!truncate_status.ok() && !truncate_status.IsNotSupported()) {
ROCKS_LOG_WARN(immutable_db_options_.info_log,
"Failed to truncate log #%" PRIu64 ": %s", wal_number,
truncate_status.ToString().c_str());
}
}
if (log_ptr) {
*log_ptr = log;
}
return s;
}
Status DBImpl::RestoreAliveLogFiles(const std::vector<uint64_t>& wal_numbers) {
if (wal_numbers.empty()) {
return Status::OK();
}
Status s;
mutex_.AssertHeld();
assert(immutable_db_options_.avoid_flush_during_recovery);
if (two_write_queues_) {
log_write_mutex_.Lock();
}
// Mark these as alive so they'll be considered for deletion later by
// FindObsoleteFiles()
total_log_size_ = 0;
log_empty_ = false;
for (auto wal_number : wal_numbers) {
// We preallocate space for wals, but then after a crash and restart, those
// preallocated space are not needed anymore. It is likely only the last
// log has such preallocated space, so we only truncate for the last log.
LogFileNumberSize log;
s = GetLogSizeAndMaybeTruncate(
wal_number, /*truncate=*/(wal_number == wal_numbers.back()), &log);
if (!s.ok()) {
break;
}
total_log_size_ += log.size;
alive_log_files_.push_back(log);
}
if (two_write_queues_) {
log_write_mutex_.Unlock();
}
return s;
}
Status DBImpl::WriteLevel0TableForRecovery(int job_id, ColumnFamilyData* cfd,
MemTable* mem, VersionEdit* edit) {
mutex_.AssertHeld();
const uint64_t start_micros = immutable_db_options_.clock->NowMicros();
FileMetaData meta;
std::vector<BlobFileAddition> blob_file_additions;
std::unique_ptr<std::list<uint64_t>::iterator> pending_outputs_inserted_elem(
new std::list<uint64_t>::iterator(
CaptureCurrentFileNumberInPendingOutputs()));
meta.fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
ReadOptions ro;
ro.total_order_seek = true;
Arena arena;
Status s;
TableProperties table_properties;
{
ScopedArenaIterator iter(mem->NewIterator(ro, &arena));
ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
"[%s] [WriteLevel0TableForRecovery]"
" Level-0 table #%" PRIu64 ": started",
cfd->GetName().c_str(), meta.fd.GetNumber());
// Get the latest mutable cf options while the mutex is still locked
const MutableCFOptions mutable_cf_options =
*cfd->GetLatestMutableCFOptions();
bool paranoid_file_checks =
cfd->GetLatestMutableCFOptions()->paranoid_file_checks;
int64_t _current_time = 0;
immutable_db_options_.clock->GetCurrentTime(&_current_time)
.PermitUncheckedError(); // ignore error
const uint64_t current_time = static_cast<uint64_t>(_current_time);
meta.oldest_ancester_time = current_time;
{
auto write_hint = cfd->CalculateSSTWriteHint(0);
mutex_.Unlock();
SequenceNumber earliest_write_conflict_snapshot;
std::vector<SequenceNumber> snapshot_seqs =
snapshots_.GetAll(&earliest_write_conflict_snapshot);
auto snapshot_checker = snapshot_checker_.get();
if (use_custom_gc_ && snapshot_checker == nullptr) {
snapshot_checker = DisableGCSnapshotChecker::Instance();
}
std::vector<std::unique_ptr<FragmentedRangeTombstoneIterator>>
range_del_iters;
auto range_del_iter =
mem->NewRangeTombstoneIterator(ro, kMaxSequenceNumber);
if (range_del_iter != nullptr) {
range_del_iters.emplace_back(range_del_iter);
}
IOStatus io_s;
TableBuilderOptions tboptions(
*cfd->ioptions(), mutable_cf_options, cfd->internal_comparator(),
cfd->int_tbl_prop_collector_factories(),
GetCompressionFlush(*cfd->ioptions(), mutable_cf_options),
mutable_cf_options.compression_opts, cfd->GetID(), cfd->GetName(),
0 /* level */, false /* is_bottommost */,
TableFileCreationReason::kRecovery, current_time,
0 /* oldest_key_time */, 0 /* file_creation_time */, db_id_,
db_session_id_, 0 /* target_file_size */, meta.fd.GetNumber());
s = BuildTable(
dbname_, versions_.get(), immutable_db_options_, tboptions,
file_options_for_compaction_, cfd->table_cache(), iter.get(),
std::move(range_del_iters), &meta, &blob_file_additions,
snapshot_seqs, earliest_write_conflict_snapshot, snapshot_checker,
paranoid_file_checks, cfd->internal_stats(), &io_s, io_tracer_,
&event_logger_, job_id, Env::IO_HIGH, nullptr /* table_properties */,
write_hint, nullptr /*full_history_ts_low*/, &blob_callback_);
LogFlush(immutable_db_options_.info_log);
ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
"[%s] [WriteLevel0TableForRecovery]"
" Level-0 table #%" PRIu64 ": %" PRIu64 " bytes %s",
cfd->GetName().c_str(), meta.fd.GetNumber(),
meta.fd.GetFileSize(), s.ToString().c_str());
mutex_.Lock();
// TODO(AR) is this ok?
if (!io_s.ok() && s.ok()) {
s = io_s;
}
}
}
ReleaseFileNumberFromPendingOutputs(pending_outputs_inserted_elem);
// Note that if file_size is zero, the file has been deleted and
// should not be added to the manifest.
const bool has_output = meta.fd.GetFileSize() > 0;
constexpr int level = 0;
if (s.ok() && has_output) {
edit->AddFile(level, meta.fd.GetNumber(), meta.fd.GetPathId(),
meta.fd.GetFileSize(), meta.smallest, meta.largest,
meta.fd.smallest_seqno, meta.fd.largest_seqno,
meta.marked_for_compaction, meta.oldest_blob_file_number,
meta.oldest_ancester_time, meta.file_creation_time,
meta.file_checksum, meta.file_checksum_func_name);
for (const auto& blob : blob_file_additions) {
edit->AddBlobFile(blob);
}
}
InternalStats::CompactionStats stats(CompactionReason::kFlush, 1);
stats.micros = immutable_db_options_.clock->NowMicros() - start_micros;
if (has_output) {
stats.bytes_written = meta.fd.GetFileSize();
stats.num_output_files = 1;
}
const auto& blobs = edit->GetBlobFileAdditions();
for (const auto& blob : blobs) {
stats.bytes_written_blob += blob.GetTotalBlobBytes();
}
stats.num_output_files_blob = static_cast<int>(blobs.size());
cfd->internal_stats()->AddCompactionStats(level, Env::Priority::USER, stats);
cfd->internal_stats()->AddCFStats(
InternalStats::BYTES_FLUSHED,
stats.bytes_written + stats.bytes_written_blob);
RecordTick(stats_, COMPACT_WRITE_BYTES, meta.fd.GetFileSize());
return s;
}
Status DB::Open(const Options& options, const std::string& dbname, DB** dbptr) {
DBOptions db_options(options);
ColumnFamilyOptions cf_options(options);
std::vector<ColumnFamilyDescriptor> column_families;
column_families.push_back(
ColumnFamilyDescriptor(kDefaultColumnFamilyName, cf_options));
if (db_options.persist_stats_to_disk) {
column_families.push_back(
ColumnFamilyDescriptor(kPersistentStatsColumnFamilyName, cf_options));
}
std::vector<ColumnFamilyHandle*> handles;
Status s = DB::Open(db_options, dbname, column_families, &handles, dbptr);
if (s.ok()) {
if (db_options.persist_stats_to_disk) {
assert(handles.size() == 2);
} else {
assert(handles.size() == 1);
}
// i can delete the handle since DBImpl is always holding a reference to
// default column family
if (db_options.persist_stats_to_disk && handles[1] != nullptr) {
delete handles[1];
}
delete handles[0];
}
return s;
}
Status DB::Open(const DBOptions& db_options, const std::string& dbname,
const std::vector<ColumnFamilyDescriptor>& column_families,
std::vector<ColumnFamilyHandle*>* handles, DB** dbptr) {
const bool kSeqPerBatch = true;
const bool kBatchPerTxn = true;
return DBImpl::Open(db_options, dbname, column_families, handles, dbptr,
!kSeqPerBatch, kBatchPerTxn);
}
IOStatus DBImpl::CreateWAL(uint64_t log_file_num, uint64_t recycle_log_number,
size_t preallocate_block_size,
log::Writer** new_log) {
IOStatus io_s;
std::unique_ptr<FSWritableFile> lfile;
DBOptions db_options =
BuildDBOptions(immutable_db_options_, mutable_db_options_);
FileOptions opt_file_options =
fs_->OptimizeForLogWrite(file_options_, db_options);
std::string wal_dir = immutable_db_options_.GetWalDir();
std::string log_fname = LogFileName(wal_dir, log_file_num);
if (recycle_log_number) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"reusing log %" PRIu64 " from recycle list\n",
recycle_log_number);
std::string old_log_fname = LogFileName(wal_dir, recycle_log_number);
TEST_SYNC_POINT("DBImpl::CreateWAL:BeforeReuseWritableFile1");
TEST_SYNC_POINT("DBImpl::CreateWAL:BeforeReuseWritableFile2");
io_s = fs_->ReuseWritableFile(log_fname, old_log_fname, opt_file_options,
&lfile, /*dbg=*/nullptr);
} else {
io_s = NewWritableFile(fs_.get(), log_fname, &lfile, opt_file_options);
}
if (io_s.ok()) {
lfile->SetWriteLifeTimeHint(CalculateWALWriteHint());
lfile->SetPreallocationBlockSize(preallocate_block_size);
const auto& listeners = immutable_db_options_.listeners;
FileTypeSet tmp_set = immutable_db_options_.checksum_handoff_file_types;
std::unique_ptr<WritableFileWriter> file_writer(new WritableFileWriter(
std::move(lfile), log_fname, opt_file_options,
immutable_db_options_.clock, io_tracer_, nullptr /* stats */, listeners,
nullptr, tmp_set.Contains(FileType::kWalFile),
tmp_set.Contains(FileType::kWalFile)));
*new_log = new log::Writer(std::move(file_writer), log_file_num,
immutable_db_options_.recycle_log_file_num > 0,
immutable_db_options_.manual_wal_flush);
}
return io_s;
}
Status DBImpl::Open(const DBOptions& db_options, const std::string& dbname,
const std::vector<ColumnFamilyDescriptor>& column_families,
std::vector<ColumnFamilyHandle*>* handles, DB** dbptr,
const bool seq_per_batch, const bool batch_per_txn) {
Status s = ValidateOptionsByTable(db_options, column_families);
if (!s.ok()) {
return s;
}
s = ValidateOptions(db_options, column_families);
if (!s.ok()) {
return s;
}
*dbptr = nullptr;
handles->clear();
size_t max_write_buffer_size = 0;
for (auto cf : column_families) {
max_write_buffer_size =
std::max(max_write_buffer_size, cf.options.write_buffer_size);
}
DBImpl* impl = new DBImpl(db_options, dbname, seq_per_batch, batch_per_txn);
s = impl->env_->CreateDirIfMissing(impl->immutable_db_options_.GetWalDir());
if (s.ok()) {
std::vector<std::string> paths;
for (auto& db_path : impl->immutable_db_options_.db_paths) {
paths.emplace_back(db_path.path);
}
for (auto& cf : column_families) {
for (auto& cf_path : cf.options.cf_paths) {
paths.emplace_back(cf_path.path);
}
}
for (auto& path : paths) {
s = impl->env_->CreateDirIfMissing(path);
if (!s.ok()) {
break;
}
}
// For recovery from NoSpace() error, we can only handle
// the case where the database is stored in a single path
if (paths.size() <= 1) {
impl->error_handler_.EnableAutoRecovery();
}
}
if (s.ok()) {
s = impl->CreateArchivalDirectory();
}
if (!s.ok()) {
delete impl;
return s;
}
impl->wal_in_db_path_ = impl->immutable_db_options_.IsWalDirSameAsDBPath();
impl->mutex_.Lock();
// Handles create_if_missing, error_if_exists
uint64_t recovered_seq(kMaxSequenceNumber);
s = impl->Recover(column_families, false, false, false, &recovered_seq);
if (s.ok()) {
uint64_t new_log_number = impl->versions_->NewFileNumber();
log::Writer* new_log = nullptr;
const size_t preallocate_block_size =
impl->GetWalPreallocateBlockSize(max_write_buffer_size);
s = impl->CreateWAL(new_log_number, 0 /*recycle_log_number*/,
preallocate_block_size, &new_log);
if (s.ok()) {
InstrumentedMutexLock wl(&impl->log_write_mutex_);
impl->logfile_number_ = new_log_number;
assert(new_log != nullptr);
assert(impl->logs_.empty());
impl->logs_.emplace_back(new_log_number, new_log);
}
if (s.ok()) {
// set column family handles
for (auto cf : column_families) {
auto cfd =
impl->versions_->GetColumnFamilySet()->GetColumnFamily(cf.name);
if (cfd != nullptr) {
handles->push_back(
new ColumnFamilyHandleImpl(cfd, impl, &impl->mutex_));
impl->NewThreadStatusCfInfo(cfd);
} else {
if (db_options.create_missing_column_families) {
// missing column family, create it
ColumnFamilyHandle* handle;
impl->mutex_.Unlock();
s = impl->CreateColumnFamily(cf.options, cf.name, &handle);
impl->mutex_.Lock();
if (s.ok()) {
handles->push_back(handle);
} else {
break;
}
} else {
s = Status::InvalidArgument("Column family not found", cf.name);
break;
}
}
}
}
if (s.ok()) {
SuperVersionContext sv_context(/* create_superversion */ true);
for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
impl->InstallSuperVersionAndScheduleWork(
cfd, &sv_context, *cfd->GetLatestMutableCFOptions());
}
sv_context.Clean();
if (impl->two_write_queues_) {
impl->log_write_mutex_.Lock();
}
impl->alive_log_files_.push_back(
DBImpl::LogFileNumberSize(impl->logfile_number_));
if (impl->two_write_queues_) {
impl->log_write_mutex_.Unlock();
}
impl->DeleteObsoleteFiles();
s = impl->directories_.GetDbDir()->Fsync(IOOptions(), nullptr);
TEST_SYNC_POINT("DBImpl::Open:AfterDeleteFilesAndSyncDir");
}
if (s.ok()) {
// In WritePrepared there could be gap in sequence numbers. This breaks
// the trick we use in kPointInTimeRecovery which assumes the first seq in
// the log right after the corrupted log is one larger than the last seq
// we read from the wals. To let this trick keep working, we add a dummy
// entry with the expected sequence to the first log right after recovery.
// In non-WritePrepared case also the new log after recovery could be
// empty, and thus missing the consecutive seq hint to distinguish
// middle-log corruption to corrupted-log-remained-after-recovery. This
// case also will be addressed by a dummy write.
if (recovered_seq != kMaxSequenceNumber) {
WriteBatch empty_batch;
WriteBatchInternal::SetSequence(&empty_batch, recovered_seq);
WriteOptions write_options;
uint64_t log_used, log_size;
log::Writer* log_writer = impl->logs_.back().writer;
s = impl->WriteToWAL(empty_batch, log_writer, &log_used, &log_size);
if (s.ok()) {
// Need to fsync, otherwise it might get lost after a power reset.
s = impl->FlushWAL(false);
if (s.ok()) {
s = log_writer->file()->Sync(impl->immutable_db_options_.use_fsync);
}
}
}
}
}
if (s.ok() && impl->immutable_db_options_.persist_stats_to_disk) {
// try to read format version
s = impl->PersistentStatsProcessFormatVersion();
}
if (s.ok()) {
for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
if (cfd->ioptions()->compaction_style == kCompactionStyleFIFO) {
auto* vstorage = cfd->current()->storage_info();
for (int i = 1; i < vstorage->num_levels(); ++i) {
int num_files = vstorage->NumLevelFiles(i);
if (num_files > 0) {
s = Status::InvalidArgument(
"Not all files are at level 0. Cannot "
"open with FIFO compaction style.");
break;
}
}
}
if (!cfd->mem()->IsSnapshotSupported()) {
impl->is_snapshot_supported_ = false;
}
if (cfd->ioptions()->merge_operator != nullptr &&
!cfd->mem()->IsMergeOperatorSupported()) {
s = Status::InvalidArgument(
"The memtable of column family %s does not support merge operator "
"its options.merge_operator is non-null",
cfd->GetName().c_str());
}
if (!s.ok()) {
break;
}
}
}
TEST_SYNC_POINT("DBImpl::Open:Opened");
Status persist_options_status;
if (s.ok()) {
// Persist RocksDB Options before scheduling the compaction.
// The WriteOptionsFile() will release and lock the mutex internally.
persist_options_status = impl->WriteOptionsFile(
false /*need_mutex_lock*/, false /*need_enter_write_thread*/);
*dbptr = impl;
impl->opened_successfully_ = true;
impl->MaybeScheduleFlushOrCompaction();
} else {
persist_options_status.PermitUncheckedError();
}
impl->mutex_.Unlock();
#ifndef ROCKSDB_LITE
auto sfm = static_cast<SstFileManagerImpl*>(
impl->immutable_db_options_.sst_file_manager.get());
if (s.ok() && sfm) {
// Set Statistics ptr for SstFileManager to dump the stats of
// DeleteScheduler.
sfm->SetStatisticsPtr(impl->immutable_db_options_.statistics);
ROCKS_LOG_INFO(impl->immutable_db_options_.info_log,
"SstFileManager instance %p", sfm);
// Notify SstFileManager about all sst files that already exist in
// db_paths[0] and cf_paths[0] when the DB is opened.
// SstFileManagerImpl needs to know sizes of the files. For files whose size
// we already know (sst files that appear in manifest - typically that's the
// vast majority of all files), we'll pass the size to SstFileManager.
// For all other files SstFileManager will query the size from filesystem.
std::vector<LiveFileMetaData> metadata;
// TODO: Once GetLiveFilesMetaData supports blob files, update the logic
// below to get known_file_sizes for blob files.
impl->mutex_.Lock();
impl->versions_->GetLiveFilesMetaData(&metadata);
impl->mutex_.Unlock();
std::unordered_map<std::string, uint64_t> known_file_sizes;
for (const auto& md : metadata) {
std::string name = md.name;
if (!name.empty() && name[0] == '/') {
name = name.substr(1);
}
known_file_sizes[name] = md.size;
}
std::vector<std::string> paths;
paths.emplace_back(impl->immutable_db_options_.db_paths[0].path);
for (auto& cf : column_families) {
if (!cf.options.cf_paths.empty()) {
paths.emplace_back(cf.options.cf_paths[0].path);
}
}
// Remove duplicate paths.
std::sort(paths.begin(), paths.end());
paths.erase(std::unique(paths.begin(), paths.end()), paths.end());
for (auto& path : paths) {
std::vector<std::string> existing_files;
impl->immutable_db_options_.env->GetChildren(path, &existing_files)
.PermitUncheckedError(); //**TODO: What do to on error?
for (auto& file_name : existing_files) {
uint64_t file_number;
FileType file_type;
std::string file_path = path + "/" + file_name;
if (ParseFileName(file_name, &file_number, &file_type) &&
(file_type == kTableFile || file_type == kBlobFile)) {
// TODO: Check for errors from OnAddFile?
if (known_file_sizes.count(file_name)) {
// We're assuming that each sst file name exists in at most one of
// the paths.
sfm->OnAddFile(file_path, known_file_sizes.at(file_name))
.PermitUncheckedError();
} else {
sfm->OnAddFile(file_path).PermitUncheckedError();
}
}
}
}
// Reserve some disk buffer space. This is a heuristic - when we run out
// of disk space, this ensures that there is atleast write_buffer_size
// amount of free space before we resume DB writes. In low disk space
// conditions, we want to avoid a lot of small L0 files due to frequent
// WAL write failures and resultant forced flushes
sfm->ReserveDiskBuffer(max_write_buffer_size,
impl->immutable_db_options_.db_paths[0].path);
}
#endif // !ROCKSDB_LITE
if (s.ok()) {
ROCKS_LOG_HEADER(impl->immutable_db_options_.info_log, "DB pointer %p",
impl);
LogFlush(impl->immutable_db_options_.info_log);
assert(impl->TEST_WALBufferIsEmpty());
// If the assert above fails then we need to FlushWAL before returning
// control back to the user.
if (!persist_options_status.ok()) {
s = Status::IOError(
"DB::Open() failed --- Unable to persist Options file",
persist_options_status.ToString());
}
} else {
ROCKS_LOG_WARN(impl->immutable_db_options_.info_log,
"Persisting Option File error: %s",
persist_options_status.ToString().c_str());
}
if (s.ok()) {
impl->StartPeriodicWorkScheduler();
} else {
for (auto* h : *handles) {
delete h;
}
handles->clear();
delete impl;
*dbptr = nullptr;
}
return s;
}
} // namespace ROCKSDB_NAMESPACE