2913241df1
Use per CF-id reference count instead, and use handles as result of add operations. These must either be explicitly released or stored (rp_set), or they will release the corresponding replay_position upon destruction. Note: this does _not_ remove the replay positioning ordering requirement for mutations. It just removes it as a means to track segment liveness.
137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Modified by ScyllaDB
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* Copyright (C) 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdint.h>
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#include "utils/UUID.hh"
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namespace db {
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using segment_id_type = uint64_t;
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using position_type = uint32_t;
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struct replay_position {
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static const constexpr size_t max_cpu_bits = 10; // 1024 cpus. should be enough for anyone
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static const constexpr size_t max_ts_bits = 8 * sizeof(segment_id_type) - max_cpu_bits;
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static const constexpr segment_id_type ts_mask = (segment_id_type(1) << max_ts_bits) - 1;
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static const constexpr segment_id_type cpu_mask = ~ts_mask;
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segment_id_type id;
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position_type pos;
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replay_position(segment_id_type i = 0, position_type p = 0)
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: id(i), pos(p)
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{}
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replay_position(unsigned shard, segment_id_type i, position_type p = 0)
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: id((segment_id_type(shard) << max_ts_bits) | i), pos(p)
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{
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if (i & cpu_mask) {
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throw std::invalid_argument("base id overflow: " + std::to_string(i));
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}
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}
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bool operator<(const replay_position & r) const {
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return id < r.id ? true : (r.id < id ? false : pos < r.pos);
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}
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bool operator<=(const replay_position & r) const {
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return !(r < *this);
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}
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bool operator==(const replay_position & r) const {
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return id == r.id && pos == r.pos;
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}
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bool operator!=(const replay_position & r) const {
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return !(*this == r);
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}
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unsigned shard_id() const {
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return unsigned(id >> max_ts_bits);
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}
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segment_id_type base_id() const {
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return id & ts_mask;
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}
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replay_position base() const {
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return replay_position(base_id(), pos);
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}
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template <typename Describer>
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auto describe_type(Describer f) { return f(id, pos); }
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};
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class commitlog;
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class cf_holder;
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using cf_id_type = utils::UUID;
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class rp_handle {
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public:
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rp_handle() noexcept;
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rp_handle(rp_handle&&) noexcept;
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rp_handle& operator=(rp_handle&&) noexcept;
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~rp_handle();
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replay_position release();
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operator bool() const {
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return _h && _rp != replay_position();
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}
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operator const replay_position&() const {
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return _rp;
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}
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const replay_position& rp() const {
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return _rp;
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}
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private:
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friend class commitlog;
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rp_handle(shared_ptr<cf_holder>, cf_id_type, replay_position) noexcept;
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::shared_ptr<cf_holder> _h;
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cf_id_type _cf;
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replay_position _rp;
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};
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std::ostream& operator<<(std::ostream& out, const replay_position& s);
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}
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