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rocksdb/db/db_impl/db_impl_secondary.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "db/db_impl/db_impl_secondary.h"
#include <cinttypes>
#include "db/arena_wrapped_db_iter.h"
#include "db/merge_context.h"
#include "logging/auto_roll_logger.h"
#include "monitoring/perf_context_imp.h"
#include "util/cast_util.h"
namespace rocksdb {
#ifndef ROCKSDB_LITE
DBImplSecondary::DBImplSecondary(const DBOptions& db_options,
const std::string& dbname)
: DBImpl(db_options, dbname) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Opening the db in secondary mode");
LogFlush(immutable_db_options_.info_log);
}
DBImplSecondary::~DBImplSecondary() {}
Status DBImplSecondary::Recover(
const std::vector<ColumnFamilyDescriptor>& column_families,
bool /*readonly*/, bool /*error_if_log_file_exist*/,
bool /*error_if_data_exists_in_logs*/) {
mutex_.AssertHeld();
JobContext job_context(0);
Status s;
s = static_cast<ReactiveVersionSet*>(versions_.get())
->Recover(column_families, &manifest_reader_, &manifest_reporter_,
&manifest_reader_status_);
if (!s.ok()) {
return s;
}
if (immutable_db_options_.paranoid_checks && s.ok()) {
s = CheckConsistency();
}
// Initial max_total_in_memory_state_ before recovery logs.
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;
}
if (s.ok()) {
default_cf_handle_ = new ColumnFamilyHandleImpl(
versions_->GetColumnFamilySet()->GetDefault(), this, &mutex_);
default_cf_internal_stats_ = default_cf_handle_->cfd()->internal_stats();
single_column_family_mode_ =
versions_->GetColumnFamilySet()->NumberOfColumnFamilies() == 1;
std::unordered_set<ColumnFamilyData*> cfds_changed;
s = FindAndRecoverLogFiles(&cfds_changed, &job_context);
}
if (s.IsPathNotFound()) {
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Secondary tries to read WAL, but WAL file(s) have already "
"been purged by primary.");
s = Status::OK();
}
// TODO: update options_file_number_ needed?
job_context.Clean();
return s;
}
// find new WAL and apply them in order to the secondary instance
Status DBImplSecondary::FindAndRecoverLogFiles(
std::unordered_set<ColumnFamilyData*>* cfds_changed,
JobContext* job_context) {
assert(nullptr != cfds_changed);
assert(nullptr != job_context);
Status s;
std::vector<uint64_t> logs;
s = FindNewLogNumbers(&logs);
if (s.ok() && !logs.empty()) {
SequenceNumber next_sequence(kMaxSequenceNumber);
s = RecoverLogFiles(logs, &next_sequence, cfds_changed, job_context);
}
return s;
}
// List wal_dir and find all new WALs, return these log numbers
Status DBImplSecondary::FindNewLogNumbers(std::vector<uint64_t>* logs) {
assert(logs != nullptr);
std::vector<std::string> filenames;
Status s;
s = env_->GetChildren(immutable_db_options_.wal_dir, &filenames);
if (s.IsNotFound()) {
return Status::InvalidArgument("Failed to open wal_dir",
immutable_db_options_.wal_dir);
} else if (!s.ok()) {
return s;
}
// if log_readers_ is non-empty, it means we have applied all logs with log
// numbers smaller than the smallest log in log_readers_, so there is no
// need to pass these logs to RecoverLogFiles
uint64_t log_number_min = 0;
if (!log_readers_.empty()) {
log_number_min = log_readers_.begin()->first;
}
for (size_t i = 0; i < filenames.size(); i++) {
uint64_t number;
FileType type;
if (ParseFileName(filenames[i], &number, &type) && type == kLogFile &&
number >= log_number_min) {
logs->push_back(number);
}
}
// Recover logs in the order that they were generated
if (!logs->empty()) {
std::sort(logs->begin(), logs->end());
}
return s;
}
Status DBImplSecondary::MaybeInitLogReader(
uint64_t log_number, log::FragmentBufferedReader** log_reader) {
auto iter = log_readers_.find(log_number);
// make sure the log file is still present
if (iter == log_readers_.end() ||
iter->second->reader_->GetLogNumber() != log_number) {
// delete the obsolete log reader if log number mismatch
if (iter != log_readers_.end()) {
log_readers_.erase(iter);
}
// initialize log reader from log_number
// TODO: min_log_number_to_keep_2pc check needed?
// Open the log file
std::string fname = LogFileName(immutable_db_options_.wal_dir, log_number);
ROCKS_LOG_INFO(immutable_db_options_.info_log,
"Recovering log #%" PRIu64 " mode %d", log_number,
static_cast<int>(immutable_db_options_.wal_recovery_mode));
std::unique_ptr<SequentialFileReader> file_reader;
{
std::unique_ptr<SequentialFile> file;
Status status = env_->NewSequentialFile(
fname, &file, env_->OptimizeForLogRead(env_options_));
if (!status.ok()) {
*log_reader = nullptr;
return status;
}
file_reader.reset(new SequentialFileReader(
std::move(file), fname, immutable_db_options_.log_readahead_size));
}
// Create the log reader.
LogReaderContainer* log_reader_container = new LogReaderContainer(
env_, immutable_db_options_.info_log, std::move(fname),
std::move(file_reader), log_number);
log_readers_.insert(std::make_pair(
log_number, std::unique_ptr<LogReaderContainer>(log_reader_container)));
}
iter = log_readers_.find(log_number);
assert(iter != log_readers_.end());
*log_reader = iter->second->reader_;
return Status::OK();
}
// After manifest recovery, replay WALs and refresh log_readers_ if necessary
// REQUIRES: log_numbers are sorted in ascending order
Status DBImplSecondary::RecoverLogFiles(
const std::vector<uint64_t>& log_numbers, SequenceNumber* next_sequence,
std::unordered_set<ColumnFamilyData*>* cfds_changed,
JobContext* job_context) {
assert(nullptr != cfds_changed);
assert(nullptr != job_context);
mutex_.AssertHeld();
Status status;
for (auto log_number : log_numbers) {
log::FragmentBufferedReader* reader = nullptr;
status = MaybeInitLogReader(log_number, &reader);
if (!status.ok()) {
return status;
}
assert(reader != nullptr);
}
for (auto log_number : log_numbers) {
auto it = log_readers_.find(log_number);
assert(it != log_readers_.end());
log::FragmentBufferedReader* reader = it->second->reader_;
// Manually update the file number allocation counter in VersionSet.
versions_->MarkFileNumberUsed(log_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;
while (reader->ReadRecord(&record, &scratch,
immutable_db_options_.wal_recovery_mode) &&
status.ok()) {
if (record.size() < WriteBatchInternal::kHeader) {
reader->GetReporter()->Corruption(
record.size(), Status::Corruption("log record too small"));
continue;
}
WriteBatchInternal::SetContents(&batch, record);
SequenceNumber seq_of_batch = WriteBatchInternal::Sequence(&batch);
std::vector<uint32_t> column_family_ids;
status = CollectColumnFamilyIdsFromWriteBatch(batch, &column_family_ids);
if (status.ok()) {
for (const auto id : column_family_ids) {
ColumnFamilyData* cfd =
versions_->GetColumnFamilySet()->GetColumnFamily(id);
if (cfd == nullptr) {
continue;
}
if (cfds_changed->count(cfd) == 0) {
cfds_changed->insert(cfd);
}
const std::vector<FileMetaData*>& l0_files =
cfd->current()->storage_info()->LevelFiles(0);
SequenceNumber seq =
l0_files.empty() ? 0 : l0_files.back()->fd.largest_seqno;
// If the write batch's sequence number is smaller than the last
// sequence number of the largest sequence persisted for this column
// family, then its data must reside in an SST that has already been
// added in the prior MANIFEST replay.
if (seq_of_batch <= seq) {
continue;
}
auto curr_log_num = port::kMaxUint64;
if (cfd_to_current_log_.count(cfd) > 0) {
curr_log_num = cfd_to_current_log_[cfd];
}
// If the active memtable contains records added by replaying an
// earlier WAL, then we need to seal the memtable, add it to the
// immutable memtable list and create a new active memtable.
if (!cfd->mem()->IsEmpty() && (curr_log_num == port::kMaxUint64 ||
curr_log_num != log_number)) {
const MutableCFOptions mutable_cf_options =
*cfd->GetLatestMutableCFOptions();
MemTable* new_mem =
cfd->ConstructNewMemtable(mutable_cf_options, seq_of_batch);
cfd->mem()->SetNextLogNumber(log_number);
cfd->imm()->Add(cfd->mem(), &job_context->memtables_to_free);
new_mem->Ref();
cfd->SetMemtable(new_mem);
}
}
bool has_valid_writes = false;
status = WriteBatchInternal::InsertInto(
&batch, column_family_memtables_.get(),
nullptr /* flush_scheduler */, nullptr /* trim_history_scheduler*/,
true, log_number, this, false /* concurrent_memtable_writes */,
next_sequence, &has_valid_writes, seq_per_batch_, batch_per_txn_);
}
// 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
// passing null flush_scheduler will disable memtable flushing which is
// needed for secondary instances
if (status.ok()) {
for (const auto id : column_family_ids) {
ColumnFamilyData* cfd =
versions_->GetColumnFamilySet()->GetColumnFamily(id);
if (cfd == nullptr) {
continue;
}
std::unordered_map<ColumnFamilyData*, uint64_t>::iterator iter =
cfd_to_current_log_.find(cfd);
if (iter == cfd_to_current_log_.end()) {
cfd_to_current_log_.insert({cfd, log_number});
} else if (log_number > iter->second) {
iter->second = log_number;
}
}
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);
}
} else {
// We are treating this as a failure while reading since we read valid
// blocks that do not form coherent data
reader->GetReporter()->Corruption(record.size(), status);
}
}
if (!status.ok()) {
return status;
}
}
// remove logreaders from map after successfully recovering the WAL
if (log_readers_.size() > 1) {
auto erase_iter = log_readers_.begin();
std::advance(erase_iter, log_readers_.size() - 1);
log_readers_.erase(log_readers_.begin(), erase_iter);
}
return status;
}
// Implementation of the DB interface
Status DBImplSecondary::Get(const ReadOptions& read_options,
ColumnFamilyHandle* column_family, const Slice& key,
PinnableSlice* value) {
return GetImpl(read_options, column_family, key, value);
}
Status DBImplSecondary::GetImpl(const ReadOptions& read_options,
ColumnFamilyHandle* column_family,
const Slice& key, PinnableSlice* pinnable_val) {
assert(pinnable_val != nullptr);
PERF_CPU_TIMER_GUARD(get_cpu_nanos, env_);
StopWatch sw(env_, stats_, DB_GET);
PERF_TIMER_GUARD(get_snapshot_time);
auto cfh = static_cast<ColumnFamilyHandleImpl*>(column_family);
ColumnFamilyData* cfd = cfh->cfd();
if (tracer_) {
InstrumentedMutexLock lock(&trace_mutex_);
if (tracer_) {
tracer_->Get(column_family, key);
}
}
// Acquire SuperVersion
SuperVersion* super_version = GetAndRefSuperVersion(cfd);
SequenceNumber snapshot = versions_->LastSequence();
MergeContext merge_context;
SequenceNumber max_covering_tombstone_seq = 0;
Status s;
LookupKey lkey(key, snapshot);
PERF_TIMER_STOP(get_snapshot_time);
bool done = false;
if (super_version->mem->Get(lkey, pinnable_val->GetSelf(), &s, &merge_context,
&max_covering_tombstone_seq, read_options)) {
done = true;
pinnable_val->PinSelf();
RecordTick(stats_, MEMTABLE_HIT);
} else if ((s.ok() || s.IsMergeInProgress()) &&
super_version->imm->Get(
lkey, pinnable_val->GetSelf(), &s, &merge_context,
&max_covering_tombstone_seq, read_options)) {
done = true;
pinnable_val->PinSelf();
RecordTick(stats_, MEMTABLE_HIT);
}
if (!done && !s.ok() && !s.IsMergeInProgress()) {
ReturnAndCleanupSuperVersion(cfd, super_version);
return s;
}
if (!done) {
PERF_TIMER_GUARD(get_from_output_files_time);
super_version->current->Get(read_options, lkey, pinnable_val, &s,
&merge_context, &max_covering_tombstone_seq);
RecordTick(stats_, MEMTABLE_MISS);
}
{
PERF_TIMER_GUARD(get_post_process_time);
ReturnAndCleanupSuperVersion(cfd, super_version);
RecordTick(stats_, NUMBER_KEYS_READ);
size_t size = pinnable_val->size();
RecordTick(stats_, BYTES_READ, size);
RecordTimeToHistogram(stats_, BYTES_PER_READ, size);
PERF_COUNTER_ADD(get_read_bytes, size);
}
return s;
}
Iterator* DBImplSecondary::NewIterator(const ReadOptions& read_options,
ColumnFamilyHandle* column_family) {
if (read_options.managed) {
return NewErrorIterator(
Status::NotSupported("Managed iterator is not supported anymore."));
}
if (read_options.read_tier == kPersistedTier) {
return NewErrorIterator(Status::NotSupported(
"ReadTier::kPersistedData is not yet supported in iterators."));
}
Iterator* result = nullptr;
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
auto cfd = cfh->cfd();
ReadCallback* read_callback = nullptr; // No read callback provided.
if (read_options.tailing) {
return NewErrorIterator(Status::NotSupported(
"tailing iterator not supported in secondary mode"));
} else if (read_options.snapshot != nullptr) {
// TODO (yanqin) support snapshot.
return NewErrorIterator(
Status::NotSupported("snapshot not supported in secondary mode"));
} else {
auto snapshot = versions_->LastSequence();
result = NewIteratorImpl(read_options, cfd, snapshot, read_callback);
}
return result;
}
ArenaWrappedDBIter* DBImplSecondary::NewIteratorImpl(
const ReadOptions& read_options, ColumnFamilyData* cfd,
SequenceNumber snapshot, ReadCallback* read_callback) {
assert(nullptr != cfd);
SuperVersion* super_version = cfd->GetReferencedSuperVersion(&mutex_);
auto db_iter = NewArenaWrappedDbIterator(
env_, read_options, *cfd->ioptions(), super_version->mutable_cf_options,
snapshot,
super_version->mutable_cf_options.max_sequential_skip_in_iterations,
super_version->version_number, read_callback);
auto internal_iter =
NewInternalIterator(read_options, cfd, super_version, db_iter->GetArena(),
db_iter->GetRangeDelAggregator(), snapshot);
db_iter->SetIterUnderDBIter(internal_iter);
return db_iter;
}
Status DBImplSecondary::NewIterators(
const ReadOptions& read_options,
const std::vector<ColumnFamilyHandle*>& column_families,
std::vector<Iterator*>* iterators) {
if (read_options.managed) {
return Status::NotSupported("Managed iterator is not supported anymore.");
}
if (read_options.read_tier == kPersistedTier) {
return Status::NotSupported(
"ReadTier::kPersistedData is not yet supported in iterators.");
}
ReadCallback* read_callback = nullptr; // No read callback provided.
if (iterators == nullptr) {
return Status::InvalidArgument("iterators not allowed to be nullptr");
}
iterators->clear();
iterators->reserve(column_families.size());
if (read_options.tailing) {
return Status::NotSupported(
"tailing iterator not supported in secondary mode");
} else if (read_options.snapshot != nullptr) {
// TODO (yanqin) support snapshot.
return Status::NotSupported("snapshot not supported in secondary mode");
} else {
SequenceNumber read_seq = versions_->LastSequence();
for (auto cfh : column_families) {
ColumnFamilyData* cfd = static_cast<ColumnFamilyHandleImpl*>(cfh)->cfd();
iterators->push_back(
NewIteratorImpl(read_options, cfd, read_seq, read_callback));
}
}
return Status::OK();
}
Status DBImplSecondary::CheckConsistency() {
mutex_.AssertHeld();
Status s = DBImpl::CheckConsistency();
// If DBImpl::CheckConsistency() which is stricter returns success, then we
// do not need to give a second chance.
if (s.ok()) {
return s;
}
// It's possible that DBImpl::CheckConssitency() can fail because the primary
// may have removed certain files, causing the GetFileSize(name) call to
// fail and returning a PathNotFound. In this case, we take a best-effort
// approach and just proceed.
TEST_SYNC_POINT_CALLBACK(
"DBImplSecondary::CheckConsistency:AfterFirstAttempt", &s);
std::vector<LiveFileMetaData> metadata;
versions_->GetLiveFilesMetaData(&metadata);
std::string corruption_messages;
for (const auto& md : metadata) {
// md.name has a leading "/".
std::string file_path = md.db_path + md.name;
uint64_t fsize = 0;
s = env_->GetFileSize(file_path, &fsize);
if (!s.ok() &&
(env_->GetFileSize(Rocks2LevelTableFileName(file_path), &fsize).ok() ||
s.IsPathNotFound())) {
s = Status::OK();
}
if (!s.ok()) {
corruption_messages +=
"Can't access " + md.name + ": " + s.ToString() + "\n";
}
}
return corruption_messages.empty() ? Status::OK()
: Status::Corruption(corruption_messages);
}
Status DBImplSecondary::TryCatchUpWithPrimary() {
assert(versions_.get() != nullptr);
assert(manifest_reader_.get() != nullptr);
Status s;
// read the manifest and apply new changes to the secondary instance
std::unordered_set<ColumnFamilyData*> cfds_changed;
JobContext job_context(0, true /*create_superversion*/);
{
InstrumentedMutexLock lock_guard(&mutex_);
s = static_cast_with_check<ReactiveVersionSet>(versions_.get())
->ReadAndApply(&mutex_, &manifest_reader_, &cfds_changed);
ROCKS_LOG_INFO(immutable_db_options_.info_log, "Last sequence is %" PRIu64,
static_cast<uint64_t>(versions_->LastSequence()));
for (ColumnFamilyData* cfd : cfds_changed) {
if (cfd->IsDropped()) {
ROCKS_LOG_DEBUG(immutable_db_options_.info_log, "[%s] is dropped\n",
cfd->GetName().c_str());
continue;
}
VersionStorageInfo::LevelSummaryStorage tmp;
ROCKS_LOG_DEBUG(immutable_db_options_.info_log,
"[%s] Level summary: %s\n", cfd->GetName().c_str(),
cfd->current()->storage_info()->LevelSummary(&tmp));
}
// list wal_dir to discover new WALs and apply new changes to the secondary
// instance
if (s.ok()) {
s = FindAndRecoverLogFiles(&cfds_changed, &job_context);
}
if (s.IsPathNotFound()) {
ROCKS_LOG_INFO(
immutable_db_options_.info_log,
"Secondary tries to read WAL, but WAL file(s) have already "
"been purged by primary.");
s = Status::OK();
}
if (s.ok()) {
for (auto cfd : cfds_changed) {
cfd->imm()->RemoveOldMemTables(cfd->GetLogNumber(),
&job_context.memtables_to_free);
auto& sv_context = job_context.superversion_contexts.back();
cfd->InstallSuperVersion(&sv_context, &mutex_);
sv_context.NewSuperVersion();
}
}
}
job_context.Clean();
// Cleanup unused, obsolete files.
JobContext purge_files_job_context(0);
{
InstrumentedMutexLock lock_guard(&mutex_);
// Currently, secondary instance does not own the database files, thus it
// is unnecessary for the secondary to force full scan.
FindObsoleteFiles(&purge_files_job_context, /*force=*/false);
}
if (purge_files_job_context.HaveSomethingToDelete()) {
PurgeObsoleteFiles(purge_files_job_context);
}
purge_files_job_context.Clean();
return s;
}
Status DB::OpenAsSecondary(const Options& options, const std::string& dbname,
const std::string& secondary_path, DB** dbptr) {
*dbptr = nullptr;
DBOptions db_options(options);
ColumnFamilyOptions cf_options(options);
std::vector<ColumnFamilyDescriptor> column_families;
column_families.emplace_back(kDefaultColumnFamilyName, cf_options);
std::vector<ColumnFamilyHandle*> handles;
Status s = DB::OpenAsSecondary(db_options, dbname, secondary_path,
column_families, &handles, dbptr);
if (s.ok()) {
assert(handles.size() == 1);
delete handles[0];
}
return s;
}
Status DB::OpenAsSecondary(
const DBOptions& db_options, const std::string& dbname,
const std::string& secondary_path,
const std::vector<ColumnFamilyDescriptor>& column_families,
std::vector<ColumnFamilyHandle*>* handles, DB** dbptr) {
*dbptr = nullptr;
if (db_options.max_open_files != -1) {
// TODO (yanqin) maybe support max_open_files != -1 by creating hard links
// on SST files so that db secondary can still have access to old SSTs
// while primary instance may delete original.
return Status::InvalidArgument("require max_open_files to be -1");
}
DBOptions tmp_opts(db_options);
Status s;
if (nullptr == tmp_opts.info_log) {
s = CreateLoggerFromOptions(secondary_path, tmp_opts, &tmp_opts.info_log);
if (!s.ok()) {
tmp_opts.info_log = nullptr;
}
}
handles->clear();
DBImplSecondary* impl = new DBImplSecondary(tmp_opts, dbname);
impl->versions_.reset(new ReactiveVersionSet(
dbname, &impl->immutable_db_options_, impl->env_options_,
impl->table_cache_.get(), impl->write_buffer_manager_,
&impl->write_controller_));
impl->column_family_memtables_.reset(
new ColumnFamilyMemTablesImpl(impl->versions_->GetColumnFamilySet()));
impl->wal_in_db_path_ = IsWalDirSameAsDBPath(&impl->immutable_db_options_);
impl->mutex_.Lock();
s = impl->Recover(column_families, true, false, false);
if (s.ok()) {
for (auto cf : column_families) {
auto cfd =
impl->versions_->GetColumnFamilySet()->GetColumnFamily(cf.name);
if (nullptr == cfd) {
s = Status::InvalidArgument("Column family not found: ", cf.name);
break;
}
handles->push_back(new ColumnFamilyHandleImpl(cfd, impl, &impl->mutex_));
}
}
SuperVersionContext sv_context(true /* create_superversion */);
if (s.ok()) {
for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
sv_context.NewSuperVersion();
cfd->InstallSuperVersion(&sv_context, &impl->mutex_);
}
}
impl->mutex_.Unlock();
sv_context.Clean();
if (s.ok()) {
*dbptr = impl;
for (auto h : *handles) {
impl->NewThreadStatusCfInfo(
reinterpret_cast<ColumnFamilyHandleImpl*>(h)->cfd());
}
} else {
for (auto h : *handles) {
delete h;
}
handles->clear();
delete impl;
}
return s;
}
#else // !ROCKSDB_LITE
Status DB::OpenAsSecondary(const Options& /*options*/,
const std::string& /*name*/,
const std::string& /*secondary_path*/,
DB** /*dbptr*/) {
return Status::NotSupported("Not supported in ROCKSDB_LITE.");
}
Status DB::OpenAsSecondary(
const DBOptions& /*db_options*/, const std::string& /*dbname*/,
const std::string& /*secondary_path*/,
const std::vector<ColumnFamilyDescriptor>& /*column_families*/,
std::vector<ColumnFamilyHandle*>* /*handles*/, DB** /*dbptr*/) {
return Status::NotSupported("Not supported in ROCKSDB_LITE.");
}
#endif // !ROCKSDB_LITE
} // namespace rocksdb
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