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db_impl_open.cc
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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_task_scheduler.h"
#include "env/composite_env_wrapper.h"
#include "file/filename.h"
#include "file/read_write_util.h"
#include "file/sst_file_manager_impl.h"
#include "file/writable_file_writer.h"
#include "logging/logging.h"
#include "monitoring/persistent_stats_history.h"
#include "monitoring/thread_status_util.h"
#include "options/options_helper.h"
#include "rocksdb/options.h"
#include "rocksdb/table.h"
#include "rocksdb/wal_filter.h"
#include "test_util/sync_point.h"
#include "util/rate_limiter_impl.h"
#include "util/string_util.h"
#include "util/udt_util.h"
namespace ROCKSDB_NAMESPACE {
Options SanitizeOptions(const std::string& dbname, const Options& src,
bool read_only, Status* logger_creation_s) {
auto db_options =
SanitizeOptions(dbname, DBOptions(src), read_only, logger_creation_s);
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, Status* logger_creation_s) {
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 (logger_creation_s) {
*logger_creation_s = s;
}
}
}
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);
}
// 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;
}
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;
IOOptions io_opts;
io_opts.do_not_recurse = true;
auto wal_dir = immutable_db_options.GetWalDir();
Status s = immutable_db_options.fs->GetChildren(
wal_dir, io_opts, &filenames, /*IODebugContext*=*/nullptr);
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;
}
// Supported wal compression types
if (!StreamingCompressionTypeSupported(result.wal_compression)) {
result.wal_compression = kNoCompression;
ROCKS_LOG_WARN(result.info_log,
"wal_compression is disabled since only zstd is supported");
}
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");
}
if (db_options.use_direct_io_for_flush_and_compaction &&
0 == db_options.writable_file_max_buffer_size) {
return Status::InvalidArgument(
"writes in direct IO require writable_file_max_buffer_size > 0");
}
if (db_options.daily_offpeak_time_utc != "") {
int start_time, end_time;
if (!TryParseTimeRangeString(db_options.daily_offpeak_time_utc, start_time,
end_time)) {
return Status::InvalidArgument(
"daily_offpeak_time_utc should be set in the format HH:mm-HH:mm "
"(e.g. 04:30-07:30)");
} else if (start_time == end_time) {
return Status::InvalidArgument(
"start_time and end_time cannot be the same");
}
}
return Status::OK();
}
Status DBImpl::NewDB(std::vector<std::string>* new_filenames) {
VersionEdit new_db;
const WriteOptions write_options(Env::IOActivity::kDBOpen);
Status s = SetIdentityFile(write_options, 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 */,
Histograms::HISTOGRAM_ENUM_MAX /* hist_type */,
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(write_options, record);
if (s.ok()) {
s = SyncManifest(&immutable_db_options_, write_options, log.file());
}
}
if (s.ok()) {
// Make "CURRENT" file that points to the new manifest file.
s = SetCurrentFile(write_options, 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, RecoveryContext* recovery_ctx) {
mutex_.AssertHeld();
const WriteOptions write_options(Env::IOActivity::kDBOpen);
bool tmp_is_new_db = false;
bool& is_new_db = recovery_ctx ? recovery_ctx->is_new_db_ : tmp_is_new_db;
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();
IOOptions io_opts;
io_opts.do_not_recurse = true;
Status io_s = immutable_db_options_.fs->GetChildren(
dbname_, io_opts, &files_in_dbname, /*IODebugContext*=*/nullptr);
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) {
uint64_t bytes;
s = env_->GetFileSize(DescriptorFileName(dbname_, number), &bytes);
if (s.ok() && bytes != 0) {
// Found non-empty MANIFEST (descriptor log), thus best-efforts
// recovery does not have to treat the db as empty.
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());
IOOptions io_opts;
io_opts.do_not_recurse = true;
Status s = immutable_db_options_.fs->GetChildren(
dbname_, io_opts, &files_in_dbname, /*IODebugContext*=*/nullptr);
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;
}
if (s.ok() && !read_only) {
for (auto cfd : *versions_->GetColumnFamilySet()) {
// Try to trivially move files down the LSM tree to start from bottommost
// level when level_compaction_dynamic_level_bytes is enabled. This should
// only be useful when user is migrating to turning on this option.
// If a user is migrating from Level Compaction with a smaller level
// multiplier or from Universal Compaction, there may be too many
// non-empty levels and the trivial moves here are not sufficed for
// migration. Additional compactions are needed to drain unnecessary
// levels.
//
// Note that this step moves files down LSM without consulting
// SSTPartitioner. Further compactions are still needed if
// the user wants to partition SST files.
// Note that files moved in this step may not respect the compression
// option in target level.
if (cfd->ioptions()->compaction_style ==
CompactionStyle::kCompactionStyleLevel &&
cfd->ioptions()->level_compaction_dynamic_level_bytes &&
!cfd->GetLatestMutableCFOptions()->disable_auto_compactions) {
int to_level = cfd->ioptions()->num_levels - 1;
// last level is reserved
// allow_ingest_behind does not support Level Compaction,
// and per_key_placement can have infinite compaction loop for Level
// Compaction. Adjust to_level here just to be safe.
if (cfd->ioptions()->allow_ingest_behind ||
cfd->ioptions()->preclude_last_level_data_seconds > 0) {
to_level -= 1;
}
// Whether this column family has a level trivially moved
bool moved = false;
// Fill the LSM starting from to_level and going up one level at a time.
// Some loop invariants (when last level is not reserved):
// - levels in (from_level, to_level] are empty, and
// - levels in (to_level, last_level] are non-empty.
for (int from_level = to_level; from_level >= 0; --from_level) {
const std::vector<FileMetaData*>& level_files =
cfd->current()->storage_info()->LevelFiles(from_level);
if (level_files.empty() || from_level == 0) {
continue;
}
assert(from_level <= to_level);
// Trivial move files from `from_level` to `to_level`
if (from_level < to_level) {
if (!moved) {
// lsm_state will look like "[1,2,3,4,5,6,0]" for an LSM with
// 7 levels
std::string lsm_state = "[";
for (int i = 0; i < cfd->ioptions()->num_levels; ++i) {
lsm_state += std::to_string(
cfd->current()->storage_info()->NumLevelFiles(i));
if (i < cfd->ioptions()->num_levels - 1) {
lsm_state += ",";
}
}
lsm_state += "]";
ROCKS_LOG_WARN(immutable_db_options_.info_log,
"[%s] Trivially move files down the LSM when open "
"with level_compaction_dynamic_level_bytes=true,"
" lsm_state: %s (Files are moved only if DB "
"Recovery is successful).",
cfd->GetName().c_str(), lsm_state.c_str());
moved = true;
}
ROCKS_LOG_WARN(
immutable_db_options_.info_log,
"[%s] Moving %zu files from from_level-%d to from_level-%d",
cfd->GetName().c_str(), level_files.size(), from_level,
to_level);
VersionEdit edit;
edit.SetColumnFamily(cfd->GetID());
for (const FileMetaData* f : level_files) {
edit.DeleteFile(from_level, f->fd.GetNumber());
edit.AddFile(to_level, f->fd.GetNumber(), f->fd.GetPathId(),
f->fd.GetFileSize(), f->smallest, f->largest,
f->fd.smallest_seqno, f->fd.largest_seqno,
f->marked_for_compaction,
f->temperature, // this can be different from
// `last_level_temperature`
f->oldest_blob_file_number, f->oldest_ancester_time,
f->file_creation_time, f->epoch_number,
f->file_checksum, f->file_checksum_func_name,
f->unique_id, f->compensated_range_deletion_size,
f->tail_size, f->user_defined_timestamps_persisted);
ROCKS_LOG_WARN(immutable_db_options_.info_log,
"[%s] Moving #%" PRIu64
" from from_level-%d to from_level-%d %" PRIu64
" bytes\n",
cfd->GetName().c_str(), f->fd.GetNumber(),
from_level, to_level, f->fd.GetFileSize());
}
recovery_ctx->UpdateVersionEdits(cfd, edit);
}
--to_level;
}
}
}
}
s = SetupDBId(write_options, read_only, recovery_ctx);
ROCKS_LOG_INFO(immutable_db_options_.info_log, "DB ID: %s\n", db_id_.c_str());
if (s.ok() && !read_only) {
s = DeleteUnreferencedSstFiles(recovery_ctx);
}
if (immutable_db_options_.paranoid_checks && s.ok()) {
s = CheckConsistency();
}
if (s.ok() && !read_only) {
// TODO: share file descriptors (FSDirectory) with SetDirectories above
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;
}
}
}
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();
// 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) {
IOOptions io_opts;
io_opts.do_not_recurse = true;
s = immutable_db_options_.fs->GetChildren(
wal_dir, io_opts, &files_in_wal_dir, /*IODebugContext*=*/nullptr);
}
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);
assert(recovery_ctx != nullptr);
assert(versions_->GetColumnFamilySet() != nullptr);
recovery_ctx->UpdateVersionEdits(
versions_->GetColumnFamilySet()->GetDefault(), edit);
}
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,
recovery_ctx);
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 {
IOOptions io_opts;
io_opts.do_not_recurse = true;
s = immutable_db_options_.fs->GetChildren(
GetName(), io_opts, &filenames, /*IODebugContext*=*/nullptr);
}
}
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;
uint64_t options_file_size = 0;
if (options_file_number > 0) {
s = env_->GetFileSize(OptionsFileName(GetName(), options_file_number),
&options_file_size);
}
versions_->options_file_size_ = options_file_size;
}
}
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 = CreateColumnFamilyImpl(ReadOptions(Env::IOActivity::kDBOpen),
WriteOptions(Env::IOActivity::kDBOpen), 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,
std::to_string(kStatsCFCurrentFormatVersion));
}
if (s.ok()) {
s = batch.Put(persist_stats_cf_handle_, kCompatibleVersionKeyString,
std::to_string(kStatsCFCompatibleFormatVersion));
}
if (s.ok()) {
// TODO: plumb Env::IOActivity, Env::IOPriority
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 = CreateColumnFamilyImpl(ReadOptions(Env::IOActivity::kDBOpen),
WriteOptions(Env::IOActivity::kDBOpen), cfo,
kPersistentStatsColumnFamilyName, &handle);
persist_stats_cf_handle_ = static_cast<ColumnFamilyHandleImpl*>(handle);
mutex_.Lock();
}
return s;
}
Status DBImpl::LogAndApplyForRecovery(const RecoveryContext& recovery_ctx) {
mutex_.AssertHeld();
assert(versions_->descriptor_log_ == nullptr);
const ReadOptions read_options(Env::IOActivity::kDBOpen);
const WriteOptions write_options(Env::IOActivity::kDBOpen);
Status s = versions_->LogAndApply(recovery_ctx.cfds_,
recovery_ctx.mutable_cf_opts_, read_options,
write_options, recovery_ctx.edit_lists_,
&mutex_, directories_.GetDbDir());
if (s.ok() && !(recovery_ctx.files_to_delete_.empty())) {
mutex_.Unlock();
for (const auto& stale_sst_file : recovery_ctx.files_to_delete_) {
s = DeleteDBFile(&immutable_db_options_, stale_sst_file.first,
stale_sst_file.second,
/*force_bg=*/false,
/*force_fg=*/false);
if (!s.ok()) {
break;
}
}
mutex_.Lock();
}
return s;
}
void DBImpl::InvokeWalFilterIfNeededOnColumnFamilyToWalNumberMap() {
if (immutable_db_options_.wal_filter == nullptr) {
return;
}
assert(immutable_db_options_.wal_filter != nullptr);
WalFilter& wal_filter = *(immutable_db_options_.wal_filter);
std::map<std::string, uint32_t> cf_name_id_map;
std::map<uint32_t, uint64_t> cf_lognumber_map;
assert(versions_);
assert(versions_->GetColumnFamilySet());
for (auto cfd : *versions_->GetColumnFamilySet()) {
assert(cfd);
cf_name_id_map.insert(std::make_pair(cfd->GetName(), cfd->GetID()));
cf_lognumber_map.insert(std::make_pair(cfd->GetID(), cfd->GetLogNumber()));
}
wal_filter.ColumnFamilyLogNumberMap(cf_lognumber_map, cf_name_id_map);
}
bool DBImpl::InvokeWalFilterIfNeededOnWalRecord(uint64_t wal_number,
const std::string& wal_fname,
log::Reader::Reporter& reporter,
Status& status,
bool& stop_replay,
WriteBatch& batch) {
if (immutable_db_options_.wal_filter == nullptr) {
return true;
}