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
|
/**
* Tests read preference for explain command.
*
* Test is loosely based from read_pref_cmd.js.
*/
load("jstests/replsets/rslib.js");
var assertCorrectTargeting = function(explain, isMongos, secExpected) {
assert.commandWorked(explain);
var serverInfo;
if (isMongos) {
serverInfo = explain.queryPlanner.winningPlan.shards[0].serverInfo;
}
else {
serverInfo = explain.serverInfo;
}
var explainDestConn = new Mongo(serverInfo.host + ':' + serverInfo.port);
var isMaster = explainDestConn.getDB('admin').runCommand({ isMaster: 1 });
if (secExpected) {
assert(isMaster.secondary);
}
else {
assert(isMaster.ismaster);
}
};
var testAllModes = function(conn, isMongos) {
// The primary is tagged with { tag: 'one' } and the secondary with
// { tag: 'two' } so we can test the interaction of modes and tags. Test
// a bunch of combinations.
[
// mode, tagSets, expectedHost
['primary', undefined, false],
['primary', [{}], false],
['primaryPreferred', undefined, false],
['primaryPreferred', [{tag: 'one'}], false],
// Correctly uses primary and ignores the tag
['primaryPreferred', [{tag: 'two'}], false],
['secondary', undefined, true],
['secondary', [{tag: 'two'}], true],
['secondary', [{tag: 'doesntexist'}, {}], true],
['secondary', [{tag: 'doesntexist'}, {tag:'two'}], true],
['secondaryPreferred', undefined, true],
['secondaryPreferred', [{tag: 'one'}], false],
['secondaryPreferred', [{tag: 'two'}], true],
// We don't have a way to alter ping times so we can't predict where an
// untagged 'nearest' command should go, hence only test with tags.
['nearest', [{tag: 'one'}], false],
['nearest', [{tag: 'two'}], true]
].forEach(function(args) {
var mode = args[0], tagSets = args[1], secExpected = args[2];
var testDB = conn.getDB('TestDB');
conn.setSlaveOk(false); // purely rely on readPref
jsTest.log('Testing mode: ' + mode + ', tag sets: ' + tojson(tagSets));
// .explain().find()
var explainableQuery = testDB.user.explain().find();
explainableQuery.readPref(mode, tagSets);
var explain = explainableQuery.finish();
assertCorrectTargeting(explain, isMongos, secExpected);
// Set read pref on the connection.
var oldReadPrefMode = testDB.getMongo().getReadPrefMode();
var oldReadPrefTagSet = testDB.getMongo().getReadPrefTagSet();
try {
testDB.getMongo().setReadPref(mode, tagSets);
// .explain().count();
explain = testDB.user.explain().count();
assertCorrectTargeting(explain, isMongos, secExpected);
// .explain().distinct()
explain = testDB.user.explain().distinct("_id");
assertCorrectTargeting(explain, isMongos, secExpected);
// .explain().group()
explain = testDB.user.explain().group({
key: {_id: 1},
reduce: function(curr, result) {},
initial: {}
});
assertCorrectTargeting(explain, isMongos, secExpected);
} finally {
// Restore old read pref.
testDB.getMongo().setReadPref(oldReadPrefMode, oldReadPrefTagSet);
}
});
};
var st = new ShardingTest({ shards: { rs0: { nodes: 2 }}});
st.stopBalancer();
ReplSetTest.awaitRSClientHosts(st.s, st.rs0.nodes);
// Tag primary with { dc: 'ny', tag: 'one' }, secondary with { dc: 'ny', tag: 'two' }
var primary = st.rs0.getPrimary();
var secondary = st.rs0.getSecondary();
var PRIMARY_TAG = { dc: 'ny', tag: 'one' };
var SECONDARY_TAG = { dc: 'ny', tag: 'two' };
var rsConfig = primary.getDB("local").system.replset.findOne();
jsTest.log('got rsconf ' + tojson(rsConfig));
rsConfig.members.forEach(function(member) {
if (member.host == primary.host) {
member.tags = PRIMARY_TAG;
} else {
member.tags = SECONDARY_TAG;
}
});
rsConfig.version++;
jsTest.log('new rsconf ' + tojson(rsConfig));
try {
primary.adminCommand({ replSetReconfig: rsConfig });
}
catch(e) {
jsTest.log('replSetReconfig error: ' + e);
}
st.rs0.awaitSecondaryNodes();
// Force mongos to reconnect after our reconfig and also create the test database
assert.soon(function() {
try {
st.s.getDB('TestDB').runCommand({ create: 'TestColl' });
return true;
}
catch (x) {
// Intentionally caused an error that forces mongos's monitor to refresh.
jsTest.log('Caught exception while doing dummy command: ' + tojson(x));
return false;
}
});
reconnect(primary);
reconnect(secondary);
rsConfig = primary.getDB("local").system.replset.findOne();
jsTest.log('got rsconf ' + tojson(rsConfig));
var replConn = new Mongo(st.rs0.getURL());
// Make sure replica set connection is ready
_awaitRSHostViaRSMonitor(primary.name, { ok: true, tags: PRIMARY_TAG }, st.rs0.name);
_awaitRSHostViaRSMonitor(secondary.name, { ok: true, tags: SECONDARY_TAG }, st.rs0.name);
testAllModes(replConn, false);
jsTest.log('Starting test for mongos connection');
testAllModes(st.s, true);
st.stop();
|
