48 lines
2.0 KiB
C
48 lines
2.0 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <cli@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TD_SYNC_RAFT_CONFIG_CHANGE_H
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#define TD_SYNC_RAFT_CONFIG_CHANGE_H
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#include "sync_type.h"
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#include "sync_raft_proto.h"
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/**
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* Changer facilitates configuration changes. It exposes methods to handle
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* simple and joint consensus while performing the proper validation that allows
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* refusing invalid configuration changes before they affect the active
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* configuration.
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**/
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struct SSyncRaftChanger {
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SSyncRaftProgressTracker* tracker;
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SyncIndex lastIndex;
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};
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typedef int (*configChangeFp)(SSyncRaftChanger* changer, const SSyncConfChangeSingleArray* css,
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SSyncRaftProgressTrackerConfig* config, SSyncRaftProgressMap* progressMap);
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// Simple carries out a series of configuration changes that (in aggregate)
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// mutates the incoming majority config Voters[0] by at most one. This method
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// will return an error if that is not the case, if the resulting quorum is
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// zero, or if the configuration is in a joint state (i.e. if there is an
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// outgoing configuration).
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int syncRaftChangerSimpleConfig(SSyncRaftChanger* changer, const SSyncConfChangeSingleArray* css,
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SSyncRaftProgressTrackerConfig* config, SSyncRaftProgressMap* progressMap);
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int syncRaftChangerEnterJoint(SSyncRaftChanger* changer, bool autoLeave, const SSyncConfChangeSingleArray* css,
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SSyncRaftProgressTrackerConfig* config, SSyncRaftProgressMap* progressMap);
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#endif /* TD_SYNC_RAFT_CONFIG_CHANGE_H */
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