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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
// Tests that the last vote document is stored during elections and that it is loaded and used on
// startup.
//
// The test first runs a few elections and checks that the lastVote document is set correctly
// after each one.
//
// The test then restarts one node as a standalone, changes its last vote doc, and stops the
// other node. It then restarts the first node as a replicaset and manually runs
// replSetRequestVotes commands against it and checks that its response is correct.
//
// @tags: [requires_persistence]
(function() {
"use strict";
load("jstests/replsets/rslib.js"); // For getLatestOp()
var name = "last_vote";
var rst = new ReplSetTest({
name: name,
nodes: 2,
});
rst.startSet();
// Lower the election timeout to make the test run faster since it waits for multiple elections.
var conf = rst.getReplSetConfig();
conf.settings = {
electionTimeoutMillis: 6000,
};
rst.initiate(conf);
const lastVoteNS = 'local.replset.election';
function getLastVoteDoc(conn) {
assert.eq(
conn.getCollection(lastVoteNS).find().itcount(), 1, 'last vote should be singleton');
return conn.getCollection(lastVoteNS).findOne();
}
function setLastVoteDoc(conn, term, candidate) {
var newLastVote = {term: term, candidateIndex: rst.getNodeId(candidate)};
return assert.writeOK(conn.getCollection(lastVoteNS).update({}, newLastVote));
}
function assertNodeHasLastVote(node, term, candidate) {
var lastVoteDoc = getLastVoteDoc(node);
assert.eq(lastVoteDoc.term, term, node.host + " had wrong last vote term.");
assert.eq(lastVoteDoc.candidateIndex,
rst.getNodeId(candidate),
node.host + " had wrong last vote candidate.");
}
function assertCurrentTerm(node, term) {
var stat = assert.commandWorked(node.adminCommand({replSetGetStatus: 1}));
assert.eq(stat.term, term, "Term changed when it should not have");
}
jsTestLog("Test that last vote is set on successive elections");
// Run a few successive elections, alternating who becomes primary.
var numElections = 3;
for (var i = 0; i < numElections; i++) {
var primary = rst.getPrimary();
var secondary = rst.getSecondary();
var term = getLatestOp(primary).t;
// SERVER-20844 ReplSetTest starts up a single node replica set then reconfigures to the
// correct size, so secondaries didn't vote in the first election.
if (i > 0) {
jsTestLog("Last vote should have term: " + term + " and candidate: " + primary.host +
", index: " + rst.getNodeId(primary));
rst.nodes.forEach(function(node) {
assertNodeHasLastVote(node, term, primary);
});
}
assert.throws(function() {
primary.adminCommand({replSetStepDown: 60 * 10, force: true});
});
// Make sure a new primary has been established.
rst.waitForState(primary, ReplSetTest.State.SECONDARY);
rst.waitForState(secondary, ReplSetTest.State.PRIMARY);
// Reset election timeout for the old primary.
assert.commandWorked(primary.adminCommand({replSetFreeze: 0}));
}
var term = getLatestOp(rst.getPrimary()).t + 100;
jsTestLog("Test that last vote is loaded on startup");
// Ensure that all ops are replicated before stepping up node 1.
rst.awaitReplication();
// We cannot reconfig node 0 to have priority 0 if it is currently the primary,
// so we make sure node 1 is primary.
jsTestLog("Stepping up node 1");
rst.stepUp(rst.nodes[1]);
jsTestLog("Reconfiguring cluster to make node 0 unelectable so it stays SECONDARY on restart");
conf = rst.getReplSetConfigFromNode();
conf.version++;
conf.members[0].priority = 0;
reconfig(rst, conf);
rst.awaitNodesAgreeOnConfigVersion();
jsTestLog("Restarting node 0 as a standalone");
var node0 = rst.restart(0, {noReplSet: true}); // Restart as a standalone node.
jsTestLog("Stopping node 1");
rst.stop(1); // Stop node 1 so that node 0 controls the term by itself.
jsTestLog("Setting the lastVote on node 0 to term: " + term + " candidate: " +
rst.nodes[0].host + ", index: 0");
setLastVoteDoc(node0, term, rst.nodes[0]);
jsTestLog("Restarting node 0 in replica set mode");
node0 = rst.restart(0); // Restart in replSet mode again.
assert.soonNoExcept(function() {
assertCurrentTerm(node0, term);
return true;
});
jsTestLog("Manually sending node 0 a dryRun replSetRequestVotes command, " +
"expecting failure in old term");
var response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: true,
term: term - 1,
candidateIndex: 1,
configVersion: conf.version,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(!response.voteGranted,
"node granted vote in term before last vote doc: " + tojson(response));
assert.eq(response.reason,
"candidate's term is lower than mine",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term, rst.nodes[0]);
assertCurrentTerm(node0, term);
jsTestLog("Manually sending node 0 a dryRun replSetRequestVotes command in same term, " +
"expecting success but no recording of lastVote");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: true,
term: term,
candidateIndex: 1,
configVersion: conf.version,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(response.voteGranted,
"node failed to grant dryRun vote in term equal to last vote doc: " + tojson(response));
assert.eq(response.reason,
"",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term, rst.nodes[0]);
assertCurrentTerm(node0, term);
jsTestLog(
"Manually sending node 0 a replSetRequestVotes command, expecting failure in same term");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: false,
term: term,
candidateIndex: 1,
configVersion: conf.version,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(!response.voteGranted,
"node granted vote in term of last vote doc: " + tojson(response));
assert.eq(response.reason,
"already voted for another candidate this term",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term, rst.nodes[0]);
assertCurrentTerm(node0, term);
jsTestLog("Manually sending node 0 a replSetRequestVotes command, " +
"expecting success with a recording of the new lastVote");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: false,
term: term + 1,
candidateIndex: 1,
configVersion: conf.version,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term + 1,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(response.voteGranted,
"node failed to grant vote in term greater than last vote doc: " + tojson(response));
assert.eq(response.reason,
"",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term + 1, rst.nodes[1]);
assertCurrentTerm(node0, term + 1);
jsTestLog("Manually sending node 0 a dryRun replSetRequestVotes command in future term, " +
"expecting success but no recording of lastVote");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: true,
term: term + 2,
candidateIndex: 1,
configVersion: conf.version,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term + 2,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(response.voteGranted,
"node failed to grant vote in term greater than last vote doc: " + tojson(response));
assert.eq(response.reason,
"",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term + 1, rst.nodes[1]);
assertCurrentTerm(node0, term + 2);
rst.stopSet();
})();
|
