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
|
/*
* This test causes node 2 to enter rollback, reach the common point, and exit rollback, but before
* it can apply operations to bring it back to a consistent state, switch sync sources to the node
* that originally gave it the ops it is now rolling back (node 0). This test then verifies that
* node 2 refuses to use node 0 as a sync source because it doesn't contain the minValid document
* it needs to reach consistency. Node 2 is then allowed to reconnect to the node it was
* originally rolling back against (node 1) and finish its rollback. This is a regression test
* against the case where we *did* allow node 2 to sync from node 0 which gave it the very ops
* it rolled back, which could then lead to a double-rollback when node 2 was reconnected
* to node 1 and tried to apply its oplog despite not being in a consistent state.
*/
// Rollback to a stable timestamp does not set a minValid and should be able to sync from any node.
// @tags: [requires_mmapv1]
(function() {
'use strict';
load("jstests/libs/check_log.js");
load("jstests/replsets/rslib.js");
var name = "double_rollback";
var dbName = "test";
var collName = "double_rollback";
var rst = new ReplSetTest({
name: name,
nodes: [
{},
{},
{rsConfig: {priority: 0}},
{rsConfig: {arbiterOnly: true}},
{rsConfig: {arbiterOnly: true}}
],
useBridge: true
});
var nodes = rst.startSet();
rst.initiate();
// SERVER-20844 ReplSetTest starts up a single node replica set then reconfigures to the correct
// size for faster startup, so nodes[0] is always the first primary.
jsTestLog("Make sure node 0 is primary.");
assert.eq(nodes[0], rst.getPrimary());
// Wait for all data bearing nodes to get up to date.
assert.writeOK(nodes[0].getDB(dbName).getCollection(collName).insert(
{a: 1}, {writeConcern: {w: 3, wtimeout: ReplSetTest.kDefaultTimeoutMS}}));
jsTestLog("Create two partitions: [1] and [0,2,3,4].");
nodes[1].disconnect(nodes[0]);
nodes[1].disconnect(nodes[2]);
nodes[1].disconnect(nodes[3]);
nodes[1].disconnect(nodes[4]);
jsTestLog("Do a write that is replicated to [0,2,3,4].");
assert.writeOK(nodes[0].getDB(dbName).getCollection(collName + "2").insert({a: 2}, {
writeConcern: {w: 2, wtimeout: ReplSetTest.kDefaultTimeoutMS}
}));
jsTestLog("Repartition to: [0,2] and [1,3,4].");
nodes[1].reconnect(nodes[3]);
nodes[1].reconnect(nodes[4]);
nodes[3].disconnect(nodes[0]);
nodes[3].disconnect(nodes[2]);
nodes[4].disconnect(nodes[0]);
nodes[4].disconnect(nodes[2]);
jsTestLog("Ensure that 0 steps down and that 1 becomes primary.");
waitForState(nodes[0], ReplSetTest.State.SECONDARY);
waitForState(nodes[1], ReplSetTest.State.PRIMARY);
assert.eq(nodes[1], rst.getPrimary());
jsTestLog("Do a write to node 1 on the [1,3,4] side of the partition.");
assert.writeOK(nodes[1].getDB(dbName).getCollection(collName + "3").insert({a: 3}));
// Turn on failpoint on node 2 to pause rollback after oplog is truncated and minValid is set.
assert.commandWorked(nodes[2].getDB('admin').runCommand(
{configureFailPoint: 'rollbackHangBeforeFinish', mode: 'alwaysOn'}));
jsTestLog("Repartition to: [0] and [1,2,3,4].");
nodes[2].disconnect(nodes[0]);
nodes[2].reconnect(nodes[1]);
nodes[2].reconnect(nodes[3]);
nodes[2].reconnect(nodes[4]);
jsTestLog("Wait for node 2 to go into ROLLBACK and start syncing from node 1.");
// Since nodes 1 and 2 have now diverged, node 2 should go into rollback.
waitForState(nodes[2], ReplSetTest.State.ROLLBACK);
rst.awaitSyncSource(nodes[2], nodes[1]);
jsTestLog("Wait for failpoint on node 2 to pause rollback before it finishes");
// Wait for fail point message to be logged.
checkLog.contains(nodes[2], 'rollback - rollbackHangBeforeFinish fail point enabled');
jsTestLog("Repartition to: [1,3,4] and [0,2].");
nodes[2].disconnect(nodes[1]);
nodes[2].reconnect(nodes[0]);
// Turn off failpoint on node 2 to allow rollback to finish.
assert.commandWorked(nodes[2].getDB('admin').runCommand(
{configureFailPoint: 'rollbackHangBeforeFinish', mode: 'off'}));
jsTestLog("Wait for node 2 exit ROLLBACK state and go into RECOVERING");
waitForState(nodes[2], ReplSetTest.State.RECOVERING);
// At this point node 2 has truncated its oplog back to the common point and is looking
// for a sync source it can use to reach minvalid and get back into SECONDARY state. Node 0
// is the only node it can reach, but since node 0 doesn't contain node 2's minvalid oplog entry
// node 2 will refuse to use it as a sync source.
checkLog.contains(
nodes[2], "remote oplog does not contain entry with optime matching our required optime");
// Ensure our connection to node 0 is re-established, since our
// original connection should have gotten killed after node 0 stepped down.
reconnect(nodes[0]);
var node0RBID = assert.commandWorked(nodes[0].adminCommand('replSetGetRBID')).rbid;
var node1RBID = assert.commandWorked(nodes[1].adminCommand('replSetGetRBID')).rbid;
jsTestLog("Reconnect all nodes.");
nodes[0].reconnect(nodes[1]);
nodes[0].reconnect(nodes[3]);
nodes[0].reconnect(nodes[4]);
nodes[2].reconnect(nodes[1]);
nodes[2].reconnect(nodes[3]);
nodes[2].reconnect(nodes[4]);
jsTestLog("Wait for nodes 0 to roll back and both node 0 and 2 to catch up to node 1");
waitForState(nodes[0], ReplSetTest.State.SECONDARY);
waitForState(nodes[2], ReplSetTest.State.SECONDARY);
rst.awaitReplication();
// Ensure our connection to node 0 is re-established, since our connection should have gotten
// killed during node 0's transition to ROLLBACK.
reconnect(nodes[0]);
// Check that rollback happened on node 0, but not on node 2 since it had already rolled back
// and just needed to finish applying ops to reach minValid.
assert.neq(node0RBID, assert.commandWorked(nodes[0].adminCommand('replSetGetRBID')).rbid);
assert.eq(node1RBID, assert.commandWorked(nodes[1].adminCommand('replSetGetRBID')).rbid);
// Node 1 should still be primary, and should now be able to satisfy majority writes again.
assert.writeOK(nodes[1].getDB(dbName).getCollection(collName + "4").insert({a: 4}, {
writeConcern: {w: 3, wtimeout: ReplSetTest.kDefaultTimeoutMS}
}));
// Verify data consistency between nodes.
rst.checkReplicatedDataHashes();
rst.checkOplogs();
rst.stopSet();
}());
|
