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
|
/**
* Tests that secondaries do not advance their commit point to have a greater term than their
* lastApplied. This prevents incorrectly prefix-committing operations that are not majority
* committed.
* @tags: [requires_majority_read_concern]
*/
(function() {
"use strict";
load("jstests/libs/check_log.js");
load("jstests/libs/write_concern_util.js"); // for [stop|restart]ServerReplication.
const dbName = "test";
const collName = "coll";
// Set up a ReplSetTest where nodes only sync one oplog entry at a time.
const rst = new ReplSetTest(
{nodes: 5, useBridge: true, nodeOptions: {setParameter: "bgSyncOplogFetcherBatchSize=1"}});
rst.startSet();
const config = rst.getReplSetConfig();
// Prevent elections.
config.settings = {electionTimeoutMillis: 12 * 60 * 60 * 1000};
rst.initiate(config);
const nodeA = rst.nodes[0];
const nodeB = rst.nodes[1];
const nodeC = rst.nodes[2];
const nodeD = rst.nodes[3];
const nodeE = rst.nodes[4];
jsTest.log("Node A is primary in term 1. Node E is delayed.");
// A: [1]
// B: [1]
// C: [1]
// D: [1]
// E:
assert.eq(nodeA, rst.getPrimary());
nodeE.disconnect([nodeA, nodeB, nodeC, nodeD]);
assert.writeOK(nodeA.getDB(dbName)[collName].insert({term: 1}));
rst.awaitReplication(undefined, undefined, [nodeB, nodeC, nodeD]);
jsTest.log("Node B steps up in term 2 and performs a write, which is not replicated.");
// A: [1]
// B: [1] [2]
// C: [1]
// D: [1]
// E:
stopServerReplication([nodeA, nodeC, nodeD]);
assert.commandWorked(nodeB.adminCommand({replSetStepUp: 1}));
rst.waitForState(nodeA, ReplSetTest.State.SECONDARY);
assert.eq(nodeB, rst.getPrimary());
assert.writeOK(nodeB.getDB(dbName)[collName].insert({term: 2}));
jsTest.log("Node A steps up again in term 3 with votes from A, C, and D and commits a write.");
// A: [1] [3]
// B: [1] [2]
// C: [1] [3]
// D: [1] [3]
// E:
nodeB.disconnect([nodeA, nodeC, nodeD, nodeE]);
assert.commandWorked(nodeA.adminCommand({replSetStepUp: 1}));
restartServerReplication([nodeA, nodeC, nodeD]);
assert.soon(() => {
// We cannot use getPrimary() here because 2 nodes report they are primary.
return assert.commandWorked(nodeA.adminCommand({ismaster: 1})).ismaster;
});
assert.writeOK(
nodeA.getDB(dbName)[collName].insert({term: 3}, {writeConcern: {w: "majority"}}));
assert.eq(1, nodeC.getDB(dbName)[collName].find({term: 3}).itcount());
assert.eq(1, nodeD.getDB(dbName)[collName].find({term: 3}).itcount());
jsTest.log("Node E syncs from a majority node and learns the new commit point in term 3.");
// A: [1] [3]
// B: [1] [2]
// C: [1] [3]
// D: [1] [3]
// E: [1]
// The stopReplProducerOnDocument failpoint ensures that Node E stops replicating before
// applying the document {msg: "new primary"}, which is the first document of term 3. This
// depends on the oplog fetcher batch size being 1.
assert.commandWorked(nodeE.adminCommand({
configureFailPoint: "stopReplProducerOnDocument",
mode: "alwaysOn",
data: {document: {msg: "new primary"}}
}));
nodeE.reconnect([nodeA, nodeC, nodeD]);
checkLog.contains(nodeE, "stopReplProducerOnDocument fail point is enabled.");
assert.soon(() => {
return 1 === nodeE.getDB(dbName)[collName].find({term: 1}).itcount();
});
assert.eq(0, nodeE.getDB(dbName)[collName].find({term: 3}).itcount());
jsTest.log("Node E switches its sync source to B and replicates the stale branch of term 2.");
nodeE.disconnect([nodeA, nodeC, nodeD]);
nodeB.reconnect(nodeE);
assert.commandWorked(
nodeE.adminCommand({configureFailPoint: "stopReplProducerOnDocument", mode: "off"}));
assert.soon(() => {
return 1 === nodeE.getDB(dbName)[collName].find({term: 2}).itcount();
});
jsTest.log("Node E must not return the entry in term 2 as committed.");
assert.eq(0, nodeE.getDB(dbName)[collName].find({term: 2}).readConcern("majority").itcount());
jsTest.log("Reconnect the set. Node E must roll back successfully.");
nodeE.reconnect([nodeA, nodeC, nodeD]);
nodeB.reconnect([nodeA, nodeC, nodeD]);
rst.awaitReplication();
assert.eq(1, nodeE.getDB(dbName)[collName].find({term: 1}).itcount());
assert.eq(0, nodeE.getDB(dbName)[collName].find({term: 2}).itcount());
assert.eq(1, nodeE.getDB(dbName)[collName].find({term: 3}).itcount());
rst.stopSet();
}());
|
