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
233
234
235
236
237
238
|
/**
* This test checks that the metrics around election candidates and participants are set and updated
* correctly. We test this with a two node replica set by forcing multiple election handoffs and
* checking the 'electionCandidateMetrics' and 'electionParticipantMetrics' fields of replSetStatus
* after each handoff.
*/
(function() {
"use strict";
load("jstests/replsets/libs/election_handoff.js");
const testName = jsTestName();
const numNodes = 2;
const rst = ReplSetTest({name: testName, nodes: numNodes});
rst.startSet();
// Make sure there are no election timeouts firing for the duration of the test. This helps
// ensure that the test will only pass if the election handoff succeeds.
rst.initiateWithHighElectionTimeout();
const expectedElectionTimeoutMillis = 24 * 60 * 60 * 1000;
const originalPrimary = rst.getPrimary();
let originalPrimaryReplSetGetStatus =
assert.commandWorked(originalPrimary.adminCommand({replSetGetStatus: 1}));
jsTestLog("Original primary status (1): " + tojson(originalPrimaryReplSetGetStatus));
let originalPrimaryElectionCandidateMetrics =
originalPrimaryReplSetGetStatus.electionCandidateMetrics;
// Check that the 'electionCandidateMetrics' section of the replSetGetStatus response after
// replica set startup has all of the required fields and that they are set correctly.
assert(originalPrimaryElectionCandidateMetrics.lastElectionReason,
() => "Response should have an 'electionCandidateMetrics.lastElectionReason' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
assert.eq(originalPrimaryElectionCandidateMetrics.lastElectionReason, "electionTimeout");
assert(originalPrimaryElectionCandidateMetrics.lastElectionDate,
() => "Response should have an 'electionCandidateMetrics.lastElectionDate' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
assert(originalPrimaryElectionCandidateMetrics.electionTerm,
() => "Response should have an 'electionCandidateMetrics.electionTerm' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
assert.eq(originalPrimaryElectionCandidateMetrics.electionTerm, 1);
assert(
originalPrimaryElectionCandidateMetrics.lastCommittedOpTimeAtElection,
() =>
"Response should have an 'electionCandidateMetrics.lastCommittedOpTimeAtElection' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
assert(originalPrimaryElectionCandidateMetrics.lastSeenOpTimeAtElection,
() => "Response should have an 'electionCandidateMetrics.lastSeenOpTimeAtElection' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
assert(originalPrimaryElectionCandidateMetrics.numVotesNeeded,
() => "Response should have an 'electionCandidateMetrics.numVotesNeeded' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
assert.eq(originalPrimaryElectionCandidateMetrics.numVotesNeeded, 1);
assert(originalPrimaryElectionCandidateMetrics.priorityAtElection,
() => "Response should have an 'electionCandidateMetrics.priorityAtElection' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
assert.eq(originalPrimaryElectionCandidateMetrics.priorityAtElection, 1.0);
assert(originalPrimaryElectionCandidateMetrics.electionTimeoutMillis,
() => "Response should have an 'electionCandidateMetrics.electionTimeoutMillis' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
// The node runs its own election before receiving the configuration, so 'electionTimeoutMillis' is
// set to the default value.
assert.eq(originalPrimaryElectionCandidateMetrics.electionTimeoutMillis, 10000);
assert(!originalPrimaryElectionCandidateMetrics.priorPrimaryMemberId,
() => "Response should not have an 'electionCandidateMetrics.priorPrimaryMemberId' field: " +
tojson(originalPrimaryElectionCandidateMetrics));
ElectionHandoffTest.testElectionHandoff(rst, 0, 1);
const newPrimary = rst.getPrimary();
let newPrimaryReplSetGetStatus =
assert.commandWorked(newPrimary.adminCommand({replSetGetStatus: 1}));
jsTestLog("New primary status (1): " + tojson(newPrimaryReplSetGetStatus));
let newPrimaryElectionCandidateMetrics = newPrimaryReplSetGetStatus.electionCandidateMetrics;
// Check that the 'electionCandidateMetrics' section of the replSetGetStatus response for the new
// primary has all of the required fields and that they are set correctly.
assert(newPrimaryElectionCandidateMetrics.lastElectionReason,
() => "Response should have an 'electionCandidateMetrics.lastElectionReason' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert.eq(newPrimaryElectionCandidateMetrics.lastElectionReason, "stepUpRequestSkipDryRun");
assert(newPrimaryElectionCandidateMetrics.lastElectionDate,
() => "Response should have an 'electionCandidateMetrics.lastElectionDate' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert(newPrimaryElectionCandidateMetrics.electionTerm,
() => "Response should have an 'electionCandidateMetrics.electionTerm' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert.eq(newPrimaryElectionCandidateMetrics.electionTerm, 2);
assert(
newPrimaryElectionCandidateMetrics.lastCommittedOpTimeAtElection,
() =>
"Response should have an 'electionCandidateMetrics.lastCommittedOpTimeAtElection' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert(newPrimaryElectionCandidateMetrics.lastSeenOpTimeAtElection,
() => "Response should have an 'electionCandidateMetrics.lastSeenOpTimeAtElection' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert(newPrimaryElectionCandidateMetrics.numVotesNeeded,
() => "Response should have an 'electionCandidateMetrics.numVotesNeeded' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert.eq(newPrimaryElectionCandidateMetrics.numVotesNeeded, 2);
assert(newPrimaryElectionCandidateMetrics.priorityAtElection,
() => "Response should have an 'electionCandidateMetrics.priorityAtElection' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert.eq(newPrimaryElectionCandidateMetrics.priorityAtElection, 1.0);
assert(newPrimaryElectionCandidateMetrics.electionTimeoutMillis,
() => "Response should have an 'electionCandidateMetrics.electionTimeoutMillis' field: " +
tojson(newPrimaryElectionCandidateMetrics));
assert.eq(newPrimaryElectionCandidateMetrics.electionTimeoutMillis, expectedElectionTimeoutMillis);
// Since the previous primary's ID is 0, we directly assert that 0 is stored in the
// priorPrimaryMemberId field.
// TODO (SERVER-45274): Re-enable this assertion.
// assert.eq(newPrimaryElectionCandidateMetrics.priorPrimaryMemberId, 0);
let newPrimaryElectionParticipantMetrics = newPrimaryReplSetGetStatus.electionParticipantMetrics;
// The new primary should not have its 'electionParticipantMetrics' field set, since it was the
// candidate in this election and did not vote for any other node.
assert(!newPrimaryElectionParticipantMetrics,
() => "Response should not have an 'electionParticipantMetric' field: " +
tojson(newPrimaryReplSetGetStatus));
originalPrimaryReplSetGetStatus =
assert.commandWorked(originalPrimary.adminCommand({replSetGetStatus: 1}));
jsTestLog("Original primary status (2): " + tojson(originalPrimaryReplSetGetStatus));
let originalPrimaryElectionParticipantMetrics =
originalPrimaryReplSetGetStatus.electionParticipantMetrics;
// Check that the 'electionParticipantMetrics' section of the replSetGetStatus response for the
// original primary has all of the required fields and that they are set correctly.
assert(originalPrimaryElectionParticipantMetrics.votedForCandidate,
() => "Response should have an 'electionParticipantMetrics.votedForCandidate' field: " +
tojson(originalPrimaryElectionParticipantMetrics));
assert.eq(originalPrimaryElectionParticipantMetrics.votedForCandidate, true);
assert(originalPrimaryElectionParticipantMetrics.electionTerm,
() => "Response should have an 'electionParticipantMetrics.electionTerm' field: " +
tojson(originalPrimaryElectionParticipantMetrics));
assert.eq(originalPrimaryElectionParticipantMetrics.electionTerm, 2);
assert(originalPrimaryElectionParticipantMetrics.lastVoteDate,
() => "Response should have an 'electionParticipantMetrics.lastVoteDate' field: " +
tojson(originalPrimaryElectionParticipantMetrics));
assert(
originalPrimaryElectionParticipantMetrics.electionCandidateMemberId,
() => "Response should have an 'electionParticipantMetrics.electionCandidateMemberId' field: " +
tojson(originalPrimaryElectionParticipantMetrics));
assert.eq(originalPrimaryElectionParticipantMetrics.electionCandidateMemberId, 1);
// Since the node voted for the new primary, we directly assert that its voteReason is equal to
// empty string.
assert.eq(originalPrimaryElectionParticipantMetrics.voteReason, "");
assert(
originalPrimaryElectionParticipantMetrics.lastAppliedOpTimeAtElection,
() =>
"Response should have an 'electionParticipantMetrics.lastAppliedOpTimeAtElection' field: " +
tojson(originalPrimaryElectionParticipantMetrics));
assert(originalPrimaryElectionParticipantMetrics.maxAppliedOpTimeInSet,
() => "Response should have an 'electionParticipantMetrics.maxAppliedOpTimeInSet' field: " +
tojson(originalPrimaryElectionParticipantMetrics));
assert(originalPrimaryElectionParticipantMetrics.priorityAtElection,
() => "Response should have an 'electionParticipantMetrics.priorityAtElection' field: " +
tojson(originalPrimaryElectionParticipantMetrics));
assert.eq(originalPrimaryElectionParticipantMetrics.priorityAtElection, 1);
originalPrimaryElectionCandidateMetrics = originalPrimaryReplSetGetStatus.electionCandidateMetrics;
// The original primary should not have its 'electionCandidateMetrics' field set, since it was not a
// candidate in this election.
assert(!originalPrimaryElectionCandidateMetrics,
() => "Response should not have an 'electionCandidateMetrics' field: " +
tojson(originalPrimaryCandidateMetrics));
// testElectionHandoff steps down the primary with a non-zero step down period, so we need to
// unfreeze the node to allow it to initiate an election again.
assert.commandWorked(originalPrimary.adminCommand({replSetFreeze: 0}));
// Step up the original primary.
ElectionHandoffTest.testElectionHandoff(rst, 1, 0);
originalPrimaryReplSetGetStatus =
assert.commandWorked(originalPrimary.adminCommand({replSetGetStatus: 1}));
jsTestLog("Original primary status (3): " + tojson(originalPrimaryReplSetGetStatus));
originalPrimaryElectionCandidateMetrics = originalPrimaryReplSetGetStatus.electionCandidateMetrics;
// Check that the original primary's metrics are also being set properly after the second election.
assert.eq(originalPrimaryElectionCandidateMetrics.lastElectionReason, "stepUpRequestSkipDryRun");
assert.eq(originalPrimaryElectionCandidateMetrics.electionTerm, 3);
assert.eq(originalPrimaryElectionCandidateMetrics.numVotesNeeded, 2);
assert.eq(originalPrimaryElectionCandidateMetrics.priorityAtElection, 1);
assert.eq(originalPrimaryElectionCandidateMetrics.electionTimeoutMillis,
expectedElectionTimeoutMillis);
// TODO (SERVER-45274): Re-enable this assertion.
// assert.eq(originalPrimaryElectionCandidateMetrics.priorPrimaryMemberId, 1);
newPrimaryReplSetGetStatus = assert.commandWorked(newPrimary.adminCommand({replSetGetStatus: 1}));
jsTestLog("New primary status (2): " + tojson(newPrimaryReplSetGetStatus));
newPrimaryElectionCandidateMetrics = newPrimaryReplSetGetStatus.electionCandidateMetrics;
newPrimaryElectionParticipantMetrics = newPrimaryReplSetGetStatus.electionParticipantMetrics;
// The other node should not have an electionCandidateMetrics, as it just stepped down.
assert(!newPrimaryElectionCandidateMetrics,
() => "Response should not have an 'electionCandidateMetrics' field: " +
tojson(newPrimaryReplSetGetStatus));
// Check that the primary that just stepped down has its 'electionParticipantMetrics' field set
// correctly.
assert.eq(newPrimaryElectionParticipantMetrics.votedForCandidate, true);
assert.eq(newPrimaryElectionParticipantMetrics.electionTerm, 3);
assert.eq(newPrimaryElectionParticipantMetrics.electionCandidateMemberId, 0);
assert.eq(newPrimaryElectionParticipantMetrics.voteReason, "");
assert.eq(newPrimaryElectionParticipantMetrics.priorityAtElection, 1);
// Since the election participant metrics are only set in the real election, set up a failpoint that
// tells a voting node to vote yes in the dry run election and no in the real election.
assert.commandWorked(originalPrimary.adminCommand(
{configureFailPoint: "voteYesInDryRunButNoInRealElection", mode: "alwaysOn"}));
// Attempt to step up the new primary a second time. Due to the failpoint, the current primary
// should vote no, and as a result the election should fail.
assert.commandWorked(newPrimary.adminCommand({replSetFreeze: 0}));
assert.commandFailedWithCode(newPrimary.adminCommand({replSetStepUp: 1}), ErrorCodes.CommandFailed);
originalPrimaryReplSetGetStatus =
assert.commandWorked(originalPrimary.adminCommand({replSetGetStatus: 1}));
jsTestLog("Original primary status (4): " + tojson(originalPrimaryReplSetGetStatus));
originalPrimaryElectionParticipantMetrics =
originalPrimaryReplSetGetStatus.electionParticipantMetrics;
// Check that the metrics in 'electionParticipantMetrics' were updated for the original primary
// after the second election that it participated in.
assert.eq(originalPrimaryElectionParticipantMetrics.votedForCandidate, false);
assert.eq(originalPrimaryElectionParticipantMetrics.electionTerm, 4);
assert.eq(originalPrimaryElectionParticipantMetrics.electionCandidateMemberId, 1);
assert.eq(
originalPrimaryElectionParticipantMetrics.voteReason,
"forced to vote no in real election due to failpoint voteYesInDryRunButNoInRealElection set");
assert.eq(originalPrimaryElectionParticipantMetrics.priorityAtElection, 1);
rst.stopSet();
})();
|
