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
|
//
// Utilities for testing chunk manipulation: moveChunk, mergeChunks, etc.
//
load('./jstests/libs/test_background_ops.js');
//
// Start a background moveChunk.
// staticMongod: Server to use for communication, use
// "MongoRunner.runMongod({})" to make one.
// mongosURL: Like 'localhost:27017'.
// findCriteria: Like { _id: 1 }, passed to moveChunk's "find" option.
// bounds: Array of two documents that specify the lower and upper
// shard key values of a chunk to move. Specify either the
// bounds field or the find field but not both.
// ns: Like 'dbName.collectionName'.
// toShardId: Like 'shard0001'.
//
// Returns a join function; call it to wait for moveChunk to complete.
//
function moveChunkParallel(staticMongod, mongosURL, findCriteria, bounds, ns, toShardId) {
assert((findCriteria || bounds) && !(findCriteria && bounds),
'Specify either findCriteria or bounds, but not both.');
function runMoveChunk(mongosURL, findCriteria, bounds, ns, toShardId) {
assert(mongosURL && ns && toShardId, 'Missing arguments.');
assert((findCriteria || bounds) && !(findCriteria && bounds),
'Specify either findCriteria or bounds, but not both.');
var mongos = new Mongo(mongosURL), admin = mongos.getDB('admin'), cmd = {moveChunk: ns};
if (findCriteria) {
cmd.find = findCriteria;
} else {
cmd.bounds = bounds;
}
cmd.to = toShardId;
cmd._waitForDelete = true;
printjson(cmd);
var result = admin.runCommand(cmd);
printjson(result);
assert(result.ok);
}
// Return the join function.
return startParallelOps(
staticMongod, runMoveChunk, [mongosURL, findCriteria, bounds, ns, toShardId]);
}
// moveChunk starts at step 0 and proceeds to 1 (it has *finished* parsing
// options), 2 (it has reloaded config and got distributed lock) and so on.
var moveChunkStepNames = {
parsedOptions: 1,
gotDistLock: 2,
startedMoveChunk: 3, // called _recvChunkStart on recipient
reachedSteadyState: 4, // recipient reports state is "steady"
committed: 5,
done: 6
};
function numberToName(names, stepNumber) {
for (var name in names) {
if (names.hasOwnProperty(name) && names[name] == stepNumber) {
return name;
}
}
assert(false);
}
//
// Configure a failpoint to make moveChunk hang at a step.
//
function pauseMoveChunkAtStep(shardConnection, stepNumber) {
configureMoveChunkFailPoint(shardConnection, stepNumber, 'alwaysOn');
}
//
// Allow moveChunk to proceed past a step.
//
function unpauseMoveChunkAtStep(shardConnection, stepNumber) {
configureMoveChunkFailPoint(shardConnection, stepNumber, 'off');
}
function proceedToMoveChunkStep(shardConnection, stepNumber) {
jsTest.log('moveChunk proceeding from step "' +
numberToName(moveChunkStepNames, stepNumber - 1) + '" to "' +
numberToName(moveChunkStepNames, stepNumber) + '".');
pauseMoveChunkAtStep(shardConnection, stepNumber);
unpauseMoveChunkAtStep(shardConnection, stepNumber - 1);
waitForMoveChunkStep(shardConnection, stepNumber);
}
function configureMoveChunkFailPoint(shardConnection, stepNumber, mode) {
assert.between(migrateStepNames.copiedIndexes,
stepNumber,
migrateStepNames.done,
"incorrect stepNumber",
true);
var admin = shardConnection.getDB('admin');
admin.runCommand({configureFailPoint: 'moveChunkHangAtStep' + stepNumber, mode: mode});
}
//
// Wait for moveChunk to reach a step (1 through 6). Assumes only one moveChunk
// is in mongos's currentOp.
//
function waitForMoveChunkStep(shardConnection, stepNumber) {
var searchString = 'step ' + stepNumber, admin = shardConnection.getDB('admin');
assert.between(migrateStepNames.copiedIndexes,
stepNumber,
migrateStepNames.done,
"incorrect stepNumber",
true);
var msg = ('moveChunk on ' + shardConnection.shardName + ' never reached step "' +
numberToName(moveChunkStepNames, stepNumber) + '".');
assert.soon(function() {
var in_progress = admin.currentOp().inprog;
for (var i = 0; i < in_progress.length; ++i) {
var op = in_progress[i];
if (op.query && op.query.moveChunk) {
return op.msg && op.msg.startsWith(searchString);
}
}
return false;
}, msg);
}
var migrateStepNames = {
copiedIndexes: 1,
deletedPriorDataInRange: 2,
cloned: 3,
catchup: 4, // About to enter steady state.
steady: 5,
done: 6
};
//
// Configure a failpoint to make migration thread hang at a step (1 through 5).
//
function pauseMigrateAtStep(shardConnection, stepNumber) {
configureMigrateFailPoint(shardConnection, stepNumber, 'alwaysOn');
}
//
// Allow _recvChunkStart to proceed past a step.
//
function unpauseMigrateAtStep(shardConnection, stepNumber) {
configureMigrateFailPoint(shardConnection, stepNumber, 'off');
}
function proceedToMigrateStep(shardConnection, stepNumber) {
jsTest.log('Migration thread proceeding from step "' +
numberToName(migrateStepNames, stepNumber - 1) + '" to "' +
numberToName(migrateStepNames, stepNumber) + '".');
pauseMigrateAtStep(shardConnection, stepNumber);
unpauseMigrateAtStep(shardConnection, stepNumber - 1);
waitForMigrateStep(shardConnection, stepNumber);
}
function configureMigrateFailPoint(shardConnection, stepNumber, mode) {
assert.between(migrateStepNames.copiedIndexes,
stepNumber,
migrateStepNames.done,
"incorrect stepNumber",
true);
var admin = shardConnection.getDB('admin');
admin.runCommand({configureFailPoint: 'migrateThreadHangAtStep' + stepNumber, mode: mode});
}
//
// Wait for moveChunk to reach a step (1 through 6).
//
function waitForMigrateStep(shardConnection, stepNumber) {
var searchString = 'step ' + stepNumber, admin = shardConnection.getDB('admin');
assert.between(migrateStepNames.copiedIndexes,
stepNumber,
migrateStepNames.done,
"incorrect stepNumber",
true);
var msg = ('Migrate thread on ' + shardConnection.shardName + ' never reached step "' +
numberToName(migrateStepNames, stepNumber) + '".');
assert.soon(function() {
// verbose = True so we see the migration thread.
var in_progress = admin.currentOp(true).inprog;
for (var i = 0; i < in_progress.length; ++i) {
var op = in_progress[i];
if (op.desc && op.desc === 'migrateThread') {
if (op.hasOwnProperty('msg')) {
return op.msg.startsWith(searchString);
} else {
return false;
}
}
}
return false;
}, msg);
}
|
