e18b29765a
Adds a sync_point structure. A sync point is a (possibly incomplete) mapping from hint queues to a replay position in it. Users will be able to create sync points consisting of the last written positions of some hint queues, so then they can wait until hint replay in all of the queues reach that point. The sync point supports serialization - first it is serialized with the help of IDL to a binary form, and then converted to a hexadecimal string. Deserialization is also possible.
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* Copyright (C) 2021-present 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 <cstdint>
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#include <string_view>
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#include <unordered_map>
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#include <vector>
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#include <seastar/core/sstring.hh>
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#include "gms/inet_address.hh"
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#include "db/commitlog/replay_position.hh"
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namespace db {
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namespace hints {
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// A sync point is a collection of positions in hint queues which can be waited on.
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// The sync point encompasses one type of hints manager only.
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struct sync_point {
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using shard_rps = std::unordered_map<gms::inet_address, db::replay_position>;
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// ID of the host which created this sync point
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utils::UUID host_id;
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std::vector<shard_rps> regular_per_shard_rps;
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std::vector<shard_rps> mv_per_shard_rps;
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/// \brief Decodes a sync point from an encoded, textual form (a hexadecimal string).
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static sync_point decode(sstring_view s);
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/// \brief Encodes the sync point in a textual form (a hexadecimal string)
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sstring encode() const;
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bool operator==(const sync_point& other) const = default;
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};
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std::ostream& operator<<(std::ostream& out, const sync_point& sp);
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}
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}
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