fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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602 lines
20 KiB
602 lines
20 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#ifndef ROCKSDB_LITE
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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#include "utilities/transactions/pessimistic_transaction_db.h"
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#include <inttypes.h>
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#include <string>
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#include <unordered_set>
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#include <vector>
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#include "db/db_impl.h"
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#include "rocksdb/db.h"
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#include "rocksdb/options.h"
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#include "rocksdb/utilities/transaction_db.h"
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#include "util/cast_util.h"
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#include "util/mutexlock.h"
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#include "util/sync_point.h"
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#include "utilities/transactions/pessimistic_transaction.h"
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#include "utilities/transactions/transaction_db_mutex_impl.h"
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#include "utilities/transactions/write_prepared_txn_db.h"
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namespace rocksdb {
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PessimisticTransactionDB::PessimisticTransactionDB(
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DB* db, const TransactionDBOptions& txn_db_options)
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: TransactionDB(db),
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db_impl_(static_cast_with_check<DBImpl, DB>(db)),
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txn_db_options_(txn_db_options),
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lock_mgr_(this, txn_db_options_.num_stripes, txn_db_options.max_num_locks,
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txn_db_options_.max_num_deadlocks,
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txn_db_options_.custom_mutex_factory
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? txn_db_options_.custom_mutex_factory
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: std::shared_ptr<TransactionDBMutexFactory>(
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new TransactionDBMutexFactoryImpl())) {
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assert(db_impl_ != nullptr);
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info_log_ = db_impl_->GetDBOptions().info_log;
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}
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// Support initiliazing PessimisticTransactionDB from a stackable db
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//
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// PessimisticTransactionDB
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// ^ ^
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// | |
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// | +
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// | StackableDB
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// | ^
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// | |
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// + +
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// DBImpl
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// ^
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// |(inherit)
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// +
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// DB
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//
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PessimisticTransactionDB::PessimisticTransactionDB(
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StackableDB* db, const TransactionDBOptions& txn_db_options)
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: TransactionDB(db),
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db_impl_(static_cast_with_check<DBImpl, DB>(db->GetRootDB())),
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txn_db_options_(txn_db_options),
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lock_mgr_(this, txn_db_options_.num_stripes, txn_db_options.max_num_locks,
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txn_db_options_.max_num_deadlocks,
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txn_db_options_.custom_mutex_factory
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? txn_db_options_.custom_mutex_factory
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: std::shared_ptr<TransactionDBMutexFactory>(
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new TransactionDBMutexFactoryImpl())) {
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assert(db_impl_ != nullptr);
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}
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PessimisticTransactionDB::~PessimisticTransactionDB() {
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while (!transactions_.empty()) {
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delete transactions_.begin()->second;
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// TODO(myabandeh): this seems to be an unsafe approach as it is not quite
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// clear whether delete would also remove the entry from transactions_.
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}
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}
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Status PessimisticTransactionDB::VerifyCFOptions(const ColumnFamilyOptions&) {
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return Status::OK();
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}
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Status PessimisticTransactionDB::Initialize(
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const std::vector<size_t>& compaction_enabled_cf_indices,
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const std::vector<ColumnFamilyHandle*>& handles) {
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for (auto cf_ptr : handles) {
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AddColumnFamily(cf_ptr);
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}
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// Verify cf options
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for (auto handle : handles) {
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ColumnFamilyDescriptor cfd;
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Status s = handle->GetDescriptor(&cfd);
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if (!s.ok()) {
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return s;
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}
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s = VerifyCFOptions(cfd.options);
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if (!s.ok()) {
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return s;
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}
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}
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// Re-enable compaction for the column families that initially had
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// compaction enabled.
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std::vector<ColumnFamilyHandle*> compaction_enabled_cf_handles;
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compaction_enabled_cf_handles.reserve(compaction_enabled_cf_indices.size());
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for (auto index : compaction_enabled_cf_indices) {
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compaction_enabled_cf_handles.push_back(handles[index]);
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}
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Status s = EnableAutoCompaction(compaction_enabled_cf_handles);
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// create 'real' transactions from recovered shell transactions
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auto dbimpl = reinterpret_cast<DBImpl*>(GetRootDB());
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assert(dbimpl != nullptr);
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auto rtrxs = dbimpl->recovered_transactions();
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for (auto it = rtrxs.begin(); it != rtrxs.end(); it++) {
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auto recovered_trx = it->second;
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assert(recovered_trx);
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assert(recovered_trx->log_number_);
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assert(recovered_trx->name_.length());
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WriteOptions w_options;
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w_options.sync = true;
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TransactionOptions t_options;
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Transaction* real_trx = BeginTransaction(w_options, t_options, nullptr);
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assert(real_trx);
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real_trx->SetLogNumber(recovered_trx->log_number_);
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assert(recovered_trx->seq_ != kMaxSequenceNumber);
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real_trx->SetId(recovered_trx->seq_);
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s = real_trx->SetName(recovered_trx->name_);
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if (!s.ok()) {
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break;
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}
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s = real_trx->RebuildFromWriteBatch(recovered_trx->batch_);
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real_trx->SetState(Transaction::PREPARED);
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if (!s.ok()) {
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break;
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}
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}
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if (s.ok()) {
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dbimpl->DeleteAllRecoveredTransactions();
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}
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return s;
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}
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Transaction* WriteCommittedTxnDB::BeginTransaction(
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const WriteOptions& write_options, const TransactionOptions& txn_options,
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Transaction* old_txn) {
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if (old_txn != nullptr) {
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ReinitializeTransaction(old_txn, write_options, txn_options);
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return old_txn;
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} else {
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return new WriteCommittedTxn(this, write_options, txn_options);
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}
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}
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TransactionDBOptions PessimisticTransactionDB::ValidateTxnDBOptions(
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const TransactionDBOptions& txn_db_options) {
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TransactionDBOptions validated = txn_db_options;
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if (txn_db_options.num_stripes == 0) {
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validated.num_stripes = 1;
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}
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return validated;
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}
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void PessimisticTransactionDB::UpdateCFComparatorMap(
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const std::vector<ColumnFamilyHandle*>& handles) {
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auto cf_map = new std::map<uint32_t, const Comparator*>();
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for (auto h : handles) {
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auto id = h->GetID();
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const Comparator* comparator = h->GetComparator();
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(*cf_map)[id] = comparator;
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}
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cf_map_.store(cf_map);
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cf_map_gc_.reset(cf_map);
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}
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void PessimisticTransactionDB::UpdateCFComparatorMap(
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const ColumnFamilyHandle* h) {
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auto old_cf_map_ptr = cf_map_.load();
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assert(old_cf_map_ptr);
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auto cf_map = new std::map<uint32_t, const Comparator*>(*old_cf_map_ptr);
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auto id = h->GetID();
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const Comparator* comparator = h->GetComparator();
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(*cf_map)[id] = comparator;
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cf_map_.store(cf_map);
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cf_map_gc_.reset(cf_map);
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}
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Status TransactionDB::Open(const Options& options,
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const TransactionDBOptions& txn_db_options,
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const std::string& dbname, TransactionDB** dbptr) {
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DBOptions db_options(options);
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ColumnFamilyOptions cf_options(options);
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std::vector<ColumnFamilyDescriptor> column_families;
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column_families.push_back(
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ColumnFamilyDescriptor(kDefaultColumnFamilyName, cf_options));
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std::vector<ColumnFamilyHandle*> handles;
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Status s = TransactionDB::Open(db_options, txn_db_options, dbname,
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column_families, &handles, dbptr);
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if (s.ok()) {
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assert(handles.size() == 1);
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// i can delete the handle since DBImpl is always holding a reference to
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// default column family
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delete handles[0];
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}
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return s;
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}
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Status TransactionDB::Open(
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const DBOptions& db_options, const TransactionDBOptions& txn_db_options,
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const std::string& dbname,
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const std::vector<ColumnFamilyDescriptor>& column_families,
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std::vector<ColumnFamilyHandle*>* handles, TransactionDB** dbptr) {
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Status s;
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DB* db;
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ROCKS_LOG_WARN(db_options.info_log, "Transaction write_policy is " PRId32,
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static_cast<int>(txn_db_options.write_policy));
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std::vector<ColumnFamilyDescriptor> column_families_copy = column_families;
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std::vector<size_t> compaction_enabled_cf_indices;
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DBOptions db_options_2pc = db_options;
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PrepareWrap(&db_options_2pc, &column_families_copy,
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&compaction_enabled_cf_indices);
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const bool use_seq_per_batch = txn_db_options.write_policy == WRITE_PREPARED;
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s = DBImpl::Open(db_options_2pc, dbname, column_families_copy, handles, &db,
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use_seq_per_batch);
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if (s.ok()) {
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s = WrapDB(db, txn_db_options, compaction_enabled_cf_indices, *handles,
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dbptr);
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}
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return s;
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}
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void TransactionDB::PrepareWrap(
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DBOptions* db_options, std::vector<ColumnFamilyDescriptor>* column_families,
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std::vector<size_t>* compaction_enabled_cf_indices) {
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compaction_enabled_cf_indices->clear();
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// Enable MemTable History if not already enabled
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for (size_t i = 0; i < column_families->size(); i++) {
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ColumnFamilyOptions* cf_options = &(*column_families)[i].options;
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if (cf_options->max_write_buffer_number_to_maintain == 0) {
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// Setting to -1 will set the History size to max_write_buffer_number.
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cf_options->max_write_buffer_number_to_maintain = -1;
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}
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if (!cf_options->disable_auto_compactions) {
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// Disable compactions momentarily to prevent race with DB::Open
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cf_options->disable_auto_compactions = true;
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compaction_enabled_cf_indices->push_back(i);
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}
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}
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db_options->allow_2pc = true;
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}
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Status TransactionDB::WrapDB(
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// make sure this db is already opened with memtable history enabled,
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// auto compaction distabled and 2 phase commit enabled
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DB* db, const TransactionDBOptions& txn_db_options,
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const std::vector<size_t>& compaction_enabled_cf_indices,
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const std::vector<ColumnFamilyHandle*>& handles, TransactionDB** dbptr) {
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PessimisticTransactionDB* txn_db;
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switch (txn_db_options.write_policy) {
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case WRITE_UNPREPARED:
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return Status::NotSupported("WRITE_UNPREPARED is not implemented yet");
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case WRITE_PREPARED:
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txn_db = new WritePreparedTxnDB(
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db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
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break;
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case WRITE_COMMITTED:
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default:
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txn_db = new WriteCommittedTxnDB(
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db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
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}
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txn_db->UpdateCFComparatorMap(handles);
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*dbptr = txn_db;
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Status s = txn_db->Initialize(compaction_enabled_cf_indices, handles);
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return s;
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}
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Status TransactionDB::WrapStackableDB(
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// make sure this stackable_db is already opened with memtable history
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// enabled,
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// auto compaction distabled and 2 phase commit enabled
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StackableDB* db, const TransactionDBOptions& txn_db_options,
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const std::vector<size_t>& compaction_enabled_cf_indices,
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const std::vector<ColumnFamilyHandle*>& handles, TransactionDB** dbptr) {
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PessimisticTransactionDB* txn_db;
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switch (txn_db_options.write_policy) {
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case WRITE_UNPREPARED:
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return Status::NotSupported("WRITE_UNPREPARED is not implemented yet");
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case WRITE_PREPARED:
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txn_db = new WritePreparedTxnDB(
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db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
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break;
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case WRITE_COMMITTED:
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default:
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txn_db = new WriteCommittedTxnDB(
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db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
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}
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txn_db->UpdateCFComparatorMap(handles);
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*dbptr = txn_db;
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Status s = txn_db->Initialize(compaction_enabled_cf_indices, handles);
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return s;
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}
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// Let TransactionLockMgr know that this column family exists so it can
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// allocate a LockMap for it.
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void PessimisticTransactionDB::AddColumnFamily(
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const ColumnFamilyHandle* handle) {
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lock_mgr_.AddColumnFamily(handle->GetID());
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}
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Status PessimisticTransactionDB::CreateColumnFamily(
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const ColumnFamilyOptions& options, const std::string& column_family_name,
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ColumnFamilyHandle** handle) {
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InstrumentedMutexLock l(&column_family_mutex_);
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Status s = VerifyCFOptions(options);
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if (!s.ok()) {
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return s;
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}
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s = db_->CreateColumnFamily(options, column_family_name, handle);
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if (s.ok()) {
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lock_mgr_.AddColumnFamily((*handle)->GetID());
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UpdateCFComparatorMap(*handle);
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}
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return s;
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}
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// Let TransactionLockMgr know that it can deallocate the LockMap for this
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// column family.
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Status PessimisticTransactionDB::DropColumnFamily(
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ColumnFamilyHandle* column_family) {
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InstrumentedMutexLock l(&column_family_mutex_);
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Status s = db_->DropColumnFamily(column_family);
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if (s.ok()) {
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lock_mgr_.RemoveColumnFamily(column_family->GetID());
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}
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return s;
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}
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Status PessimisticTransactionDB::TryLock(PessimisticTransaction* txn,
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uint32_t cfh_id,
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const std::string& key,
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bool exclusive) {
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return lock_mgr_.TryLock(txn, cfh_id, key, GetEnv(), exclusive);
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}
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void PessimisticTransactionDB::UnLock(PessimisticTransaction* txn,
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const TransactionKeyMap* keys) {
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lock_mgr_.UnLock(txn, keys, GetEnv());
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}
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void PessimisticTransactionDB::UnLock(PessimisticTransaction* txn,
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uint32_t cfh_id, const std::string& key) {
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lock_mgr_.UnLock(txn, cfh_id, key, GetEnv());
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}
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// Used when wrapping DB write operations in a transaction
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Transaction* PessimisticTransactionDB::BeginInternalTransaction(
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const WriteOptions& options) {
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TransactionOptions txn_options;
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Transaction* txn = BeginTransaction(options, txn_options, nullptr);
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// Use default timeout for non-transactional writes
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txn->SetLockTimeout(txn_db_options_.default_lock_timeout);
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return txn;
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}
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// All user Put, Merge, Delete, and Write requests must be intercepted to make
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// sure that they lock all keys that they are writing to avoid causing conflicts
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// with any concurrent transactions. The easiest way to do this is to wrap all
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// write operations in a transaction.
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//
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// Put(), Merge(), and Delete() only lock a single key per call. Write() will
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// sort its keys before locking them. This guarantees that TransactionDB write
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// methods cannot deadlock with eachother (but still could deadlock with a
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// Transaction).
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Status PessimisticTransactionDB::Put(const WriteOptions& options,
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ColumnFamilyHandle* column_family,
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const Slice& key, const Slice& val) {
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Status s;
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Transaction* txn = BeginInternalTransaction(options);
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txn->DisableIndexing();
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// Since the client didn't create a transaction, they don't care about
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// conflict checking for this write. So we just need to do PutUntracked().
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s = txn->PutUntracked(column_family, key, val);
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if (s.ok()) {
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s = txn->Commit();
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}
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delete txn;
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return s;
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}
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Status PessimisticTransactionDB::Delete(const WriteOptions& wopts,
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ColumnFamilyHandle* column_family,
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const Slice& key) {
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Status s;
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Transaction* txn = BeginInternalTransaction(wopts);
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txn->DisableIndexing();
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// Since the client didn't create a transaction, they don't care about
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// conflict checking for this write. So we just need to do
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// DeleteUntracked().
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s = txn->DeleteUntracked(column_family, key);
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if (s.ok()) {
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s = txn->Commit();
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}
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delete txn;
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return s;
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}
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Status PessimisticTransactionDB::SingleDelete(const WriteOptions& wopts,
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ColumnFamilyHandle* column_family,
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const Slice& key) {
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Status s;
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Transaction* txn = BeginInternalTransaction(wopts);
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txn->DisableIndexing();
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// Since the client didn't create a transaction, they don't care about
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// conflict checking for this write. So we just need to do
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// SingleDeleteUntracked().
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s = txn->SingleDeleteUntracked(column_family, key);
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if (s.ok()) {
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s = txn->Commit();
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}
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delete txn;
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return s;
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}
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Status PessimisticTransactionDB::Merge(const WriteOptions& options,
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ColumnFamilyHandle* column_family,
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const Slice& key, const Slice& value) {
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Status s;
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Transaction* txn = BeginInternalTransaction(options);
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txn->DisableIndexing();
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// Since the client didn't create a transaction, they don't care about
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// conflict checking for this write. So we just need to do
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// MergeUntracked().
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s = txn->MergeUntracked(column_family, key, value);
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if (s.ok()) {
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s = txn->Commit();
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}
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delete txn;
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return s;
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}
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Status PessimisticTransactionDB::Write(const WriteOptions& opts,
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WriteBatch* updates) {
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// Need to lock all keys in this batch to prevent write conflicts with
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// concurrent transactions.
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Transaction* txn = BeginInternalTransaction(opts);
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txn->DisableIndexing();
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auto txn_impl =
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static_cast_with_check<PessimisticTransaction, Transaction>(txn);
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// Since commitBatch sorts the keys before locking, concurrent Write()
|
|
// operations will not cause a deadlock.
|
|
// In order to avoid a deadlock with a concurrent Transaction, Transactions
|
|
// should use a lock timeout.
|
|
Status s = txn_impl->CommitBatch(updates);
|
|
|
|
delete txn;
|
|
|
|
return s;
|
|
}
|
|
|
|
Status WriteCommittedTxnDB::Write(
|
|
const WriteOptions& opts,
|
|
const TransactionDBWriteOptimizations& optimizations, WriteBatch* updates) {
|
|
if (optimizations.skip_concurrency_control) {
|
|
return db_impl_->Write(opts, updates);
|
|
} else {
|
|
return Write(opts, updates);
|
|
}
|
|
}
|
|
|
|
void PessimisticTransactionDB::InsertExpirableTransaction(
|
|
TransactionID tx_id, PessimisticTransaction* tx) {
|
|
assert(tx->GetExpirationTime() > 0);
|
|
std::lock_guard<std::mutex> lock(map_mutex_);
|
|
expirable_transactions_map_.insert({tx_id, tx});
|
|
}
|
|
|
|
void PessimisticTransactionDB::RemoveExpirableTransaction(TransactionID tx_id) {
|
|
std::lock_guard<std::mutex> lock(map_mutex_);
|
|
expirable_transactions_map_.erase(tx_id);
|
|
}
|
|
|
|
bool PessimisticTransactionDB::TryStealingExpiredTransactionLocks(
|
|
TransactionID tx_id) {
|
|
std::lock_guard<std::mutex> lock(map_mutex_);
|
|
|
|
auto tx_it = expirable_transactions_map_.find(tx_id);
|
|
if (tx_it == expirable_transactions_map_.end()) {
|
|
return true;
|
|
}
|
|
PessimisticTransaction& tx = *(tx_it->second);
|
|
return tx.TryStealingLocks();
|
|
}
|
|
|
|
void PessimisticTransactionDB::ReinitializeTransaction(
|
|
Transaction* txn, const WriteOptions& write_options,
|
|
const TransactionOptions& txn_options) {
|
|
auto txn_impl =
|
|
static_cast_with_check<PessimisticTransaction, Transaction>(txn);
|
|
|
|
txn_impl->Reinitialize(this, write_options, txn_options);
|
|
}
|
|
|
|
Transaction* PessimisticTransactionDB::GetTransactionByName(
|
|
const TransactionName& name) {
|
|
std::lock_guard<std::mutex> lock(name_map_mutex_);
|
|
auto it = transactions_.find(name);
|
|
if (it == transactions_.end()) {
|
|
return nullptr;
|
|
} else {
|
|
return it->second;
|
|
}
|
|
}
|
|
|
|
void PessimisticTransactionDB::GetAllPreparedTransactions(
|
|
std::vector<Transaction*>* transv) {
|
|
assert(transv);
|
|
transv->clear();
|
|
std::lock_guard<std::mutex> lock(name_map_mutex_);
|
|
for (auto it = transactions_.begin(); it != transactions_.end(); it++) {
|
|
if (it->second->GetState() == Transaction::PREPARED) {
|
|
transv->push_back(it->second);
|
|
}
|
|
}
|
|
}
|
|
|
|
TransactionLockMgr::LockStatusData
|
|
PessimisticTransactionDB::GetLockStatusData() {
|
|
return lock_mgr_.GetLockStatusData();
|
|
}
|
|
|
|
std::vector<DeadlockPath> PessimisticTransactionDB::GetDeadlockInfoBuffer() {
|
|
return lock_mgr_.GetDeadlockInfoBuffer();
|
|
}
|
|
|
|
void PessimisticTransactionDB::SetDeadlockInfoBufferSize(uint32_t target_size) {
|
|
lock_mgr_.Resize(target_size);
|
|
}
|
|
|
|
void PessimisticTransactionDB::RegisterTransaction(Transaction* txn) {
|
|
assert(txn);
|
|
assert(txn->GetName().length() > 0);
|
|
assert(GetTransactionByName(txn->GetName()) == nullptr);
|
|
assert(txn->GetState() == Transaction::STARTED);
|
|
std::lock_guard<std::mutex> lock(name_map_mutex_);
|
|
transactions_[txn->GetName()] = txn;
|
|
}
|
|
|
|
void PessimisticTransactionDB::UnregisterTransaction(Transaction* txn) {
|
|
assert(txn);
|
|
std::lock_guard<std::mutex> lock(name_map_mutex_);
|
|
auto it = transactions_.find(txn->GetName());
|
|
assert(it != transactions_.end());
|
|
transactions_.erase(it);
|
|
}
|
|
|
|
} // namespace rocksdb
|
|
#endif // ROCKSDB_LITE
|
|
|