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
|
// Test queries that set the OplogReplay flag.
// @tags: [requires_replication, requires_capped]
(function() {
"use strict";
load("jstests/libs/analyze_plan.js");
function test(t) {
t.drop();
assert.commandWorked(
t.getDB().createCollection(t.getName(), {capped: true, size: 16 * 1024}));
const isOplog = t.getName().startsWith("oplog.");
/**
* Helper function for making timestamps with the property that if i < j, then makeTS(i) <
* makeTS(j).
*/
function makeTS(i) {
return Timestamp(1000, i);
}
for (let i = 1; i <= 100; i++) {
assert.writeOK(t.insert({_id: i, ts: makeTS(i)}));
}
// Missing 'ts' field.
assert.throws(function() {
t.find().addOption(DBQuery.Option.oplogReplay).next();
});
assert.throws(function() {
t.find({_id: 3}).addOption(DBQuery.Option.oplogReplay).next();
});
// 'ts' field is not top-level.
assert.throws(function() {
t.find({$or: [{ts: {$gt: makeTS(3)}}, {foo: 3}]})
.addOption(DBQuery.Option.oplogReplay)
.next();
});
assert.throws(function() {
t.find({$nor: [{ts: {$gt: makeTS(4)}}, {foo: 4}]})
.addOption(DBQuery.Option.oplogReplay)
.next();
});
// There is no $eq, $gt or $gte predicate on 'ts'.
assert.throws(function() {
t.find({ts: {$lt: makeTS(4)}}).addOption(DBQuery.Option.oplogReplay).next();
});
assert.throws(function() {
t.find({ts: {$lt: makeTS(4)}, _id: 3}).addOption(DBQuery.Option.oplogReplay).next();
});
// A $gt query on just the 'ts' field should return the next document after the timestamp.
var cursor = t.find({ts: {$gt: makeTS(20)}}).addOption(DBQuery.Option.oplogReplay);
assert.eq(21, cursor.next()["_id"]);
assert.eq(22, cursor.next()["_id"]);
// A $gte query on the 'ts' field should include the timestamp.
cursor = t.find({ts: {$gte: makeTS(20)}}).addOption(DBQuery.Option.oplogReplay);
assert.eq(20, cursor.next()["_id"]);
assert.eq(21, cursor.next()["_id"]);
// An $eq query on the 'ts' field should return the single record with the timestamp.
cursor = t.find({ts: {$eq: makeTS(20)}}).addOption(DBQuery.Option.oplogReplay);
assert.eq(20, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An AND with both a $gt and $lt query on the 'ts' field will correctly return results in
// the proper bounds.
cursor = t.find({
$and: [{ts: {$lt: makeTS(5)}}, {ts: {$gt: makeTS(1)}}]
}).addOption(DBQuery.Option.oplogReplay);
assert.eq(2, cursor.next()["_id"]);
assert.eq(3, cursor.next()["_id"]);
assert.eq(4, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An AND with multiple predicates on the 'ts' field correctly returns results on the
// tightest range.
cursor = t.find({
$and: [
{ts: {$gte: makeTS(2)}},
{ts: {$gt: makeTS(3)}},
{ts: {$lte: makeTS(7)}},
{ts: {$lt: makeTS(7)}}
]
}).addOption(DBQuery.Option.oplogReplay);
assert.eq(4, cursor.next()["_id"]);
assert.eq(5, cursor.next()["_id"]);
assert.eq(6, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An AND with an $eq predicate in conjunction with other bounds correctly returns one
// result.
cursor = t.find({
$and: [
{ts: {$gte: makeTS(1)}},
{ts: {$gt: makeTS(2)}},
{ts: {$eq: makeTS(5)}},
{ts: {$lte: makeTS(8)}},
{ts: {$lt: makeTS(8)}}
]
}).addOption(DBQuery.Option.oplogReplay);
assert.eq(5, cursor.next()["_id"]);
assert(!cursor.hasNext());
// An $eq query stops scanning after passing the max timestamp.
let res = t.find({ts: {$eq: makeTS(10)}})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
// If this is the oplog, we expect to be able to seek directly to the entry with a 'ts' of
// 10. Otherwise, we have to scan from the beginning of the oplog.
let expectedDocsExamined = isOplog ? 2 : 11;
assert.lte(res.executionStats.totalDocsExamined, expectedDocsExamined, tojson(res));
let collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// An AND with an $lt predicate stops scanning after passing the max timestamp.
res = t.find({$and: [{ts: {$gte: makeTS(1)}}, {ts: {$lt: makeTS(10)}}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 11, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// An AND with an $lte predicate stops scanning after passing the max timestamp.
res = t.find({$and: [{ts: {$gte: makeTS(1)}}, {ts: {$lte: makeTS(10)}}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 12, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// The max timestamp is respected even when the min timestamp is smaller than the lowest
// timestamp in the collection.
res = t.find({$and: [{ts: {$gte: makeTS(0)}}, {ts: {$lte: makeTS(10)}}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
assert.lte(res.executionStats.totalDocsExamined, 12, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(10), collScanStage.maxTs, tojson(res));
// An AND with redundant $eq/$lt/$lte predicates stops scanning after passing the max
// timestamp.
res = t.find({
$and: [
{ts: {$gte: makeTS(0)}},
{ts: {$lte: makeTS(10)}},
{ts: {$eq: makeTS(5)}},
{ts: {$lt: makeTS(20)}}
]
})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
// If this is the oplog, we expect to be able to seek directly to the entry with a 'ts' of
// 5. Otherwise, we have to scan from the beginning of the oplog.
expectedDocsExamined = isOplog ? 2 : 11;
assert.lte(res.executionStats.totalDocsExamined, expectedDocsExamined, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(5), collScanStage.maxTs, tojson(res));
// An $eq query for a non-existent timestamp scans a single oplog document.
res = t.find({ts: {$eq: makeTS(200)}})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
// If this is the oplog, we expect to be able to seek directly to the end of the oplog.
// Otherwise, we have to scan the entire oplog before determining that 'ts' 100 does not
// exist.
expectedDocsExamined = isOplog ? 1 : 100;
assert.lte(res.executionStats.totalDocsExamined, expectedDocsExamined, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(200), collScanStage.maxTs, tojson(res));
// When the filter matches the last document within the timestamp range, the collection scan
// examines at most one more document.
res = t.find({$and: [{ts: {$gte: makeTS(4)}}, {ts: {$lte: makeTS(8)}}, {_id: 8}]})
.addOption(DBQuery.Option.oplogReplay)
.explain("executionStats");
assert.commandWorked(res);
// If this is the oplog, we expect to be able to seek directly to the start of the 'ts'
// range. Otherwise, we have to scan the capped collection from the beginning.
expectedDocsExamined = isOplog ? 6 : 9;
assert.lte(res.executionStats.totalDocsExamined, expectedDocsExamined, tojson(res));
collScanStage = getPlanStage(res.executionStats.executionStages, "COLLSCAN");
assert.neq(
null, collScanStage, "no collection scan found in explain output: " + tojson(res));
assert.eq(makeTS(8), collScanStage.maxTs, tojson(res));
// A query over both 'ts' and '_id' should only pay attention to the 'ts' field for finding
// the oplog start (SERVER-13566).
cursor = t.find({ts: {$gte: makeTS(20)}, _id: 25}).addOption(DBQuery.Option.oplogReplay);
assert.eq(25, cursor.next()["_id"]);
assert(!cursor.hasNext());
}
jsTestLog("Non-oplog.");
// Test that oplog replay on a non-oplog collection succeeds.
test(db.jstests_query_oplogreplay);
jsTestLog("Oplog.");
// Test that oplog replay on the actual oplog succeeds.
test(db.getSiblingDB("local").oplog.jstests_query_oplogreplay);
// Test that oplog replay on a non-capped collection fails.
const coll = db.jstests_query_oplogreplay;
coll.drop();
assert.commandWorked(coll.getDB().createCollection(coll.getName()));
assert.throws(function() {
coll.find({ts: {$gt: "abcd"}}).addOption(DBQuery.Option.oplogReplay).next();
});
}());
|
