1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/**
* Copyright 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/election_winner_declarer.h"
#include "mongo/base/status.h"
#include "mongo/db/repl/replication_executor.h"
#include "mongo/db/repl/scatter_gather_runner.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
ElectionWinnerDeclarer::Algorithm::Algorithm(const std::string& setName,
long long winnerId,
long long term,
const std::vector<HostAndPort>& targets) :
_setName(setName),
_winnerId(winnerId),
_term(term),
_targets(targets) {}
ElectionWinnerDeclarer::Algorithm::~Algorithm() {}
std::vector<RemoteCommandRequest>
ElectionWinnerDeclarer::Algorithm::getRequests() const {
BSONObjBuilder declareElectionWinnerCmdBuilder;
declareElectionWinnerCmdBuilder.append("replSetDeclareElectionWinner", 1);
declareElectionWinnerCmdBuilder.append("setName", _setName);
declareElectionWinnerCmdBuilder.append("winnerId", _winnerId);
declareElectionWinnerCmdBuilder.append("term", _term);
const BSONObj declareElectionWinnerCmd = declareElectionWinnerCmdBuilder.obj();
std::vector<RemoteCommandRequest> requests;
for (const auto& target : _targets) {
requests.push_back(RemoteCommandRequest(
target,
"admin",
declareElectionWinnerCmd,
Milliseconds(30*1000))); // trying to match current Socket timeout
}
return requests;
}
void ElectionWinnerDeclarer::Algorithm::processResponse(
const RemoteCommandRequest& request,
const ResponseStatus& response) {
_responsesProcessed++;
if (!response.isOK()) { // failed response
log() << "ElectionWinnerDeclarer: Got failed response from " << request.target
<< ": " << response.getStatus();
return;
}
Status cmdResponseStatus = getStatusFromCommandResult(response.getValue().data);
if (!cmdResponseStatus.isOK()) { // disagreement response
_failed = true;
_status = cmdResponseStatus;
log() << "ElectionWinnerDeclarer: Got error response from " << request.target
<< " with term: " << response.getValue().data["term"].Number()
<< " and error: " << cmdResponseStatus;
}
}
bool ElectionWinnerDeclarer::Algorithm::hasReceivedSufficientResponses() const {
return _failed || _responsesProcessed == static_cast<int>(_targets.size());
}
ElectionWinnerDeclarer::ElectionWinnerDeclarer() : _isCanceled(false) {}
ElectionWinnerDeclarer::~ElectionWinnerDeclarer() {}
StatusWith<ReplicationExecutor::EventHandle> ElectionWinnerDeclarer::start(
ReplicationExecutor* executor,
const std::string& setName,
long long winnerId,
long long term,
const std::vector<HostAndPort>& targets,
const stdx::function<void ()>& onCompletion) {
_algorithm.reset(new Algorithm(setName, winnerId, term, targets));
_runner.reset(new ScatterGatherRunner(_algorithm.get()));
return _runner->start(executor, onCompletion);
}
void ElectionWinnerDeclarer::cancel(ReplicationExecutor* executor) {
_isCanceled = true;
_runner->cancel(executor);
}
Status ElectionWinnerDeclarer::getStatus() const {
return _algorithm->getStatus();
}
} // namespace repl
} // namespace mongo
|