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4658adbe18
This is a new type of CDC generation identifiers. Compared to old IDs, additionally to the timestamp it contains an UUID. These new identifiers will allow a safer and more efficient algorithm of introducing new generations into a cluster (introduced in a later commit). For now, nodes keep using the old identifier format when creating new generations and whenever they learn about a new CDC generation from gossip they assume that it also is stored in the v1 format. But they do know how to (de)serialize the second format and how to persist new identifiers in local tables.
46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/*
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* Copyright (C) 2021 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 <variant>
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#include "db_clock.hh"
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namespace cdc {
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struct generation_id_v1 {
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db_clock::time_point ts;
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};
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struct generation_id_v2 {
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db_clock::time_point ts;
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utils::UUID id;
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};
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using generation_id = std::variant<generation_id_v1, generation_id_v2>;
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std::ostream& operator<<(std::ostream&, const generation_id&);
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bool operator==(const generation_id&, const generation_id&);
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db_clock::time_point get_ts(const generation_id&);
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} // namespace cdc
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