rocksdb/utilities/transactions/transaction_base.cc

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// Copyright (c) 2015, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#ifndef ROCKSDB_LITE
#include "utilities/transactions/transaction_base.h"
#include "db/db_impl.h"
#include "db/column_family.h"
#include "rocksdb/comparator.h"
#include "rocksdb/db.h"
#include "rocksdb/status.h"
#include "util/string_util.h"
namespace rocksdb {
TransactionBaseImpl::TransactionBaseImpl(DB* db,
const WriteOptions& write_options)
: db_(db),
write_options_(write_options),
cmp_(GetColumnFamilyUserComparator(db->DefaultColumnFamily())),
start_time_(db_->GetEnv()->NowMicros()),
write_batch_(cmp_, 0, true) {}
TransactionBaseImpl::~TransactionBaseImpl() {}
void TransactionBaseImpl::Clear() {
save_points_.reset(nullptr);
write_batch_.Clear();
tracked_keys_.clear();
num_puts_ = 0;
num_deletes_ = 0;
num_merges_ = 0;
}
void TransactionBaseImpl::SetSnapshot() {
assert(dynamic_cast<DBImpl*>(db_) != nullptr);
auto db_impl = reinterpret_cast<DBImpl*>(db_);
const Snapshot* snapshot = db_impl->GetSnapshotForWriteConflictBoundary();
// Set a custom deleter for the snapshot_ SharedPtr as the snapshot needs to
// be released, not deleted when it is no longer referenced.
snapshot_.reset(snapshot, std::bind(&TransactionBaseImpl::ReleaseSnapshot,
this, std::placeholders::_1, db_));
snapshot_needed_ = false;
snapshot_notifier_ = nullptr;
}
void TransactionBaseImpl::SetSnapshotOnNextOperation(
std::shared_ptr<TransactionNotifier> notifier) {
snapshot_needed_ = true;
snapshot_notifier_ = notifier;
}
void TransactionBaseImpl::SetSnapshotIfNeeded() {
if (snapshot_needed_) {
std::shared_ptr<TransactionNotifier> notifier = snapshot_notifier_;
SetSnapshot();
if (notifier != nullptr) {
notifier->SnapshotCreated(GetSnapshot());
}
}
}
Status TransactionBaseImpl::TryLock(ColumnFamilyHandle* column_family,
const SliceParts& key, bool untracked) {
size_t key_size = 0;
for (int i = 0; i < key.num_parts; ++i) {
key_size += key.parts[i].size();
}
std::string str;
str.reserve(key_size);
for (int i = 0; i < key.num_parts; ++i) {
str.append(key.parts[i].data(), key.parts[i].size());
}
return TryLock(column_family, str, untracked);
}
void TransactionBaseImpl::SetSavePoint() {
if (save_points_ == nullptr) {
save_points_.reset(new std::stack<TransactionBaseImpl::SavePoint>());
}
save_points_->emplace(snapshot_, snapshot_needed_, snapshot_notifier_,
num_puts_, num_deletes_, num_merges_);
write_batch_.SetSavePoint();
}
Status TransactionBaseImpl::RollbackToSavePoint() {
if (save_points_ != nullptr && save_points_->size() > 0) {
// Restore saved SavePoint
TransactionBaseImpl::SavePoint& save_point = save_points_->top();
snapshot_ = save_point.snapshot_;
snapshot_needed_ = save_point.snapshot_needed_;
snapshot_notifier_ = save_point.snapshot_notifier_;
num_puts_ = save_point.num_puts_;
num_deletes_ = save_point.num_deletes_;
num_merges_ = save_point.num_merges_;
// Rollback batch
Status s = write_batch_.RollbackToSavePoint();
assert(s.ok());
// Rollback any keys that were tracked since the last savepoint
const TransactionKeyMap* key_map = GetTrackedKeysSinceSavePoint();
assert(key_map);
for (auto& key_map_iter : *key_map) {
uint32_t column_family_id = key_map_iter.first;
auto& keys = key_map_iter.second;
for (auto& key_iter : keys) {
const std::string& key = key_iter.first;
tracked_keys_[column_family_id].erase(key);
}
}
save_points_->pop();
return s;
} else {
assert(write_batch_.RollbackToSavePoint().IsNotFound());
return Status::NotFound();
}
}
Status TransactionBaseImpl::Get(const ReadOptions& read_options,
ColumnFamilyHandle* column_family,
const Slice& key, std::string* value) {
return write_batch_.GetFromBatchAndDB(db_, read_options, column_family, key,
value);
}
Status TransactionBaseImpl::GetForUpdate(const ReadOptions& read_options,
ColumnFamilyHandle* column_family,
const Slice& key, std::string* value) {
Status s = TryLock(column_family, key);
if (s.ok() && value != nullptr) {
s = Get(read_options, column_family, key, value);
}
return s;
}
std::vector<Status> TransactionBaseImpl::MultiGet(
const ReadOptions& read_options,
const std::vector<ColumnFamilyHandle*>& column_family,
const std::vector<Slice>& keys, std::vector<std::string>* values) {
size_t num_keys = keys.size();
values->resize(num_keys);
std::vector<Status> stat_list(num_keys);
for (size_t i = 0; i < num_keys; ++i) {
std::string* value = values ? &(*values)[i] : nullptr;
stat_list[i] = Get(read_options, column_family[i], keys[i], value);
}
return stat_list;
}
std::vector<Status> TransactionBaseImpl::MultiGetForUpdate(
const ReadOptions& read_options,
const std::vector<ColumnFamilyHandle*>& column_family,
const std::vector<Slice>& keys, std::vector<std::string>* values) {
// Regardless of whether the MultiGet succeeded, track these keys.
size_t num_keys = keys.size();
values->resize(num_keys);
// Lock all keys
for (size_t i = 0; i < num_keys; ++i) {
Status s = TryLock(column_family[i], keys[i]);
if (!s.ok()) {
// Fail entire multiget if we cannot lock all keys
return std::vector<Status>(num_keys, s);
}
}
// TODO(agiardullo): optimize multiget?
std::vector<Status> stat_list(num_keys);
for (size_t i = 0; i < num_keys; ++i) {
std::string* value = values ? &(*values)[i] : nullptr;
stat_list[i] = Get(read_options, column_family[i], keys[i], value);
}
return stat_list;
}
Iterator* TransactionBaseImpl::GetIterator(const ReadOptions& read_options) {
Iterator* db_iter = db_->NewIterator(read_options);
assert(db_iter);
return write_batch_.NewIteratorWithBase(db_iter);
}
Iterator* TransactionBaseImpl::GetIterator(const ReadOptions& read_options,
ColumnFamilyHandle* column_family) {
Iterator* db_iter = db_->NewIterator(read_options, column_family);
assert(db_iter);
return write_batch_.NewIteratorWithBase(column_family, db_iter);
}
Status TransactionBaseImpl::Put(ColumnFamilyHandle* column_family,
const Slice& key, const Slice& value) {
Status s = TryLock(column_family, key);
if (s.ok()) {
GetBatchForWrite()->Put(column_family, key, value);
num_puts_++;
}
return s;
}
Status TransactionBaseImpl::Put(ColumnFamilyHandle* column_family,
const SliceParts& key,
const SliceParts& value) {
Status s = TryLock(column_family, key);
if (s.ok()) {
GetBatchForWrite()->Put(column_family, key, value);
num_puts_++;
}
return s;
}
Status TransactionBaseImpl::Merge(ColumnFamilyHandle* column_family,
const Slice& key, const Slice& value) {
Status s = TryLock(column_family, key);
if (s.ok()) {
GetBatchForWrite()->Merge(column_family, key, value);
num_merges_++;
}
return s;
}
Status TransactionBaseImpl::Delete(ColumnFamilyHandle* column_family,
const Slice& key) {
Status s = TryLock(column_family, key);
if (s.ok()) {
GetBatchForWrite()->Delete(column_family, key);
num_deletes_++;
}
return s;
}
Status TransactionBaseImpl::Delete(ColumnFamilyHandle* column_family,
const SliceParts& key) {
Status s = TryLock(column_family, key);
if (s.ok()) {
GetBatchForWrite()->Delete(column_family, key);
num_deletes_++;
}
return s;
}
Status TransactionBaseImpl::SingleDelete(ColumnFamilyHandle* column_family,
const Slice& key) {
Status s = TryLock(column_family, key);
if (s.ok()) {
GetBatchForWrite()->SingleDelete(column_family, key);
num_deletes_++;
}
return s;
}
Status TransactionBaseImpl::SingleDelete(ColumnFamilyHandle* column_family,
const SliceParts& key) {
Status s = TryLock(column_family, key);
if (s.ok()) {
GetBatchForWrite()->SingleDelete(column_family, key);
num_deletes_++;
}
return s;
}
Status TransactionBaseImpl::PutUntracked(ColumnFamilyHandle* column_family,
const Slice& key, const Slice& value) {
bool untracked = true;
Status s = TryLock(column_family, key, untracked);
if (s.ok()) {
GetBatchForWrite()->Put(column_family, key, value);
num_puts_++;
}
return s;
}
Status TransactionBaseImpl::PutUntracked(ColumnFamilyHandle* column_family,
const SliceParts& key,
const SliceParts& value) {
bool untracked = true;
Status s = TryLock(column_family, key, untracked);
if (s.ok()) {
GetBatchForWrite()->Put(column_family, key, value);
num_puts_++;
}
return s;
}
Status TransactionBaseImpl::MergeUntracked(ColumnFamilyHandle* column_family,
const Slice& key,
const Slice& value) {
bool untracked = true;
Status s = TryLock(column_family, key, untracked);
if (s.ok()) {
GetBatchForWrite()->Merge(column_family, key, value);
num_merges_++;
}
return s;
}
Status TransactionBaseImpl::DeleteUntracked(ColumnFamilyHandle* column_family,
const Slice& key) {
bool untracked = true;
Status s = TryLock(column_family, key, untracked);
if (s.ok()) {
GetBatchForWrite()->Delete(column_family, key);
num_deletes_++;
}
return s;
}
Status TransactionBaseImpl::DeleteUntracked(ColumnFamilyHandle* column_family,
const SliceParts& key) {
bool untracked = true;
Status s = TryLock(column_family, key, untracked);
if (s.ok()) {
GetBatchForWrite()->Delete(column_family, key);
num_deletes_++;
}
return s;
}
void TransactionBaseImpl::PutLogData(const Slice& blob) {
write_batch_.PutLogData(blob);
}
WriteBatchWithIndex* TransactionBaseImpl::GetWriteBatch() {
return &write_batch_;
}
uint64_t TransactionBaseImpl::GetElapsedTime() const {
return (db_->GetEnv()->NowMicros() - start_time_) / 1000;
}
uint64_t TransactionBaseImpl::GetNumPuts() const { return num_puts_; }
uint64_t TransactionBaseImpl::GetNumDeletes() const { return num_deletes_; }
uint64_t TransactionBaseImpl::GetNumMerges() const { return num_merges_; }
uint64_t TransactionBaseImpl::GetNumKeys() const {
uint64_t count = 0;
// sum up locked keys in all column families
for (const auto& key_map_iter : tracked_keys_) {
const auto& keys = key_map_iter.second;
count += keys.size();
}
return count;
}
void TransactionBaseImpl::TrackKey(uint32_t cfh_id, const std::string& key,
SequenceNumber seq) {
auto iter = tracked_keys_[cfh_id].find(key);
if (iter == tracked_keys_[cfh_id].end()) {
tracked_keys_[cfh_id].insert({key, seq});
if (save_points_ != nullptr && !save_points_->empty()) {
// Aren't tracking this key, add it.
save_points_->top().new_keys_[cfh_id][key] = seq;
}
} else if (seq < iter->second) {
// Now tracking this key with an earlier sequence number
iter->second = seq;
}
}
const TransactionKeyMap* TransactionBaseImpl::GetTrackedKeysSinceSavePoint() {
if (save_points_ != nullptr && !save_points_->empty()) {
return &save_points_->top().new_keys_;
}
return nullptr;
}
// Gets the write batch that should be used for Put/Merge/Deletes.
//
// Returns either a WriteBatch or WriteBatchWithIndex depending on whether
// DisableIndexing() has been called.
WriteBatchBase* TransactionBaseImpl::GetBatchForWrite() {
if (indexing_enabled_) {
// Use WriteBatchWithIndex
return &write_batch_;
} else {
// Don't use WriteBatchWithIndex. Return base WriteBatch.
return write_batch_.GetWriteBatch();
}
}
void TransactionBaseImpl::ReleaseSnapshot(const Snapshot* snapshot, DB* db) {
db->ReleaseSnapshot(snapshot);
}
} // namespace rocksdb
#endif // ROCKSDB_LITE