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
|
// Test basic multi-statement transaction.
// @tags: [uses_transactions]
(function() {
"use strict";
const dbName = "test";
const collName = "multi_statement_transaction";
const testDB = db.getSiblingDB(dbName);
const testColl = testDB[collName];
testDB.runCommand({drop: collName, writeConcern: {w: "majority"}});
assert.commandWorked(
testDB.createCollection(testColl.getName(), {writeConcern: {w: "majority"}}));
const sessionOptions = {causalConsistency: false};
const session = db.getMongo().startSession(sessionOptions);
const sessionDb = session.getDatabase(dbName);
const sessionColl = sessionDb[collName];
/***********************************************************************************************
* Insert two documents in a transaction.
**********************************************************************************************/
assert.commandWorked(testColl.remove({}, {writeConcern: {w: "majority"}}));
jsTest.log("Insert two documents in a transaction");
session.startTransaction();
// Insert a doc within the transaction.
assert.commandWorked(sessionColl.insert({_id: "insert-1"}));
// Cannot read with default read concern.
assert.eq(null, testColl.findOne({_id: "insert-1"}));
// But read in the same transaction returns the doc.
assert.docEq({_id: "insert-1"}, sessionColl.findOne());
// Read with aggregation also returns the document.
let docs = sessionColl.aggregate([{$match: {_id: "insert-1"}}]).toArray();
assert.sameMembers([{_id: "insert-1"}], docs);
// Insert a doc within a transaction.
assert.commandWorked(sessionColl.insert({_id: "insert-2"}));
// Cannot read with default read concern.
assert.eq(null, testColl.findOne({_id: "insert-1"}));
// Cannot read with default read concern.
assert.eq(null, testColl.findOne({_id: "insert-2"}));
// Commit the transaction.
assert.commandWorked(session.commitTransaction_forTesting());
// Read with default read concern sees the committed transaction.
assert.eq({_id: "insert-1"}, testColl.findOne({_id: "insert-1"}));
assert.eq({_id: "insert-2"}, testColl.findOne({_id: "insert-2"}));
/***********************************************************************************************
* Update documents in a transaction.
**********************************************************************************************/
assert.commandWorked(testColl.remove({}, {writeConcern: {w: "majority"}}));
jsTest.log("Update documents in a transaction");
// Insert the docs to be updated.
assert.commandWorked(sessionColl.insert([{_id: "update-1", a: 0}, {_id: "update-2", a: 0}],
{writeConcern: {w: "majority"}}));
// Update the docs in a new transaction.
session.startTransaction();
assert.commandWorked(sessionColl.update({_id: "update-1"}, {$inc: {a: 1}}));
// Batch update in transaction.
let bulk = sessionColl.initializeUnorderedBulkOp();
bulk.find({_id: "update-1"}).updateOne({$inc: {a: 1}});
bulk.find({_id: "update-2"}).updateOne({$inc: {a: 1}});
assert.commandWorked(bulk.execute());
// Cannot read with default read concern.
assert.eq({_id: "update-1", a: 0}, testColl.findOne({_id: "update-1"}));
assert.eq({_id: "update-2", a: 0}, testColl.findOne({_id: "update-2"}));
// Commit the transaction.
assert.commandWorked(session.commitTransaction_forTesting());
// Read with default read concern sees the committed transaction.
assert.eq({_id: "update-1", a: 2}, testColl.findOne({_id: "update-1"}));
assert.eq({_id: "update-2", a: 1}, testColl.findOne({_id: "update-2"}));
/***********************************************************************************************
* Insert, update and read documents in a transaction.
**********************************************************************************************/
assert.commandWorked(testColl.remove({}, {writeConcern: {w: "majority"}}));
jsTest.log("Insert, update and read documents in a transaction");
session.startTransaction();
assert.commandWorked(sessionColl.insert([{_id: "doc-1"}, {_id: "doc-2"}]));
// Update the two docs in transaction.
assert.commandWorked(sessionColl.update({_id: "doc-1"}, {$inc: {a: 1}}));
assert.commandWorked(sessionColl.update({_id: "doc-2"}, {$inc: {a: 1}}));
// Cannot read with default read concern.
assert.eq(null, testColl.findOne({_id: "doc-1"}));
assert.eq(null, testColl.findOne({_id: "doc-2"}));
// But read in the same transaction returns the docs.
docs = sessionColl.find({$or: [{_id: "doc-1"}, {_id: "doc-2"}]}).toArray();
assert.sameMembers([{_id: "doc-1", a: 1}, {_id: "doc-2", a: 1}], docs);
// Commit the transaction.
assert.commandWorked(session.commitTransaction_forTesting());
// Read with default read concern sees the committed transaction.
assert.eq({_id: "doc-1", a: 1}, testColl.findOne({_id: "doc-1"}));
assert.eq({_id: "doc-2", a: 1}, testColl.findOne({_id: "doc-2"}));
jsTest.log("Insert and delete documents in a transaction");
assert.commandWorked(testColl.remove({}, {writeConcern: {w: "majority"}}));
assert.commandWorked(
testColl.insert([{_id: "doc-1"}, {_id: "doc-2"}], {writeConcern: {w: "majority"}}));
session.startTransaction();
assert.commandWorked(sessionColl.insert({_id: "doc-3"}));
// Remove three docs in transaction.
assert.commandWorked(sessionColl.remove({_id: "doc-1"}));
// Batch delete.
bulk = sessionColl.initializeUnorderedBulkOp();
bulk.find({_id: "doc-2"}).removeOne();
bulk.find({_id: "doc-3"}).removeOne();
assert.commandWorked(bulk.execute());
// Cannot read the new doc and still see the to-be removed docs with default read concern.
assert.eq({_id: "doc-1"}, testColl.findOne({_id: "doc-1"}));
assert.eq({_id: "doc-2"}, testColl.findOne({_id: "doc-2"}));
assert.eq(null, testColl.findOne({_id: "doc-3"}));
// But read in the same transaction sees the docs get deleted.
docs = sessionColl.find({$or: [{_id: "doc-1"}, {_id: "doc-2"}, {_id: "doc-3"}]}).toArray();
assert.sameMembers([], docs);
// Commit the transaction.
assert.commandWorked(session.commitTransaction_forTesting());
// Read with default read concern sees the commmitted transaction.
assert.eq(null, testColl.findOne({_id: "doc-1"}));
assert.eq(null, testColl.findOne({_id: "doc-2"}));
assert.eq(null, testColl.findOne({_id: "doc-3"}));
session.endSession();
}());
|
