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
|
// Test that you can shard with shard key that's only a prefix of an existing index.
//
// Part 1: Shard new collection on {num : 1} with an index on {num : 1, x : 1}.
// Test that you can split and move chunks around.
// Part 2: Test that adding an array value for x doesn't make it unusuable.
// Part 3: Shard new collection on {skey : 1} but with a longer index.
// Insert docs with same val for 'skey' but different vals for 'extra'.
// Move chunks around and check that [min,max) chunk boundaries are properly obeyed.
(function() {
'use strict';
var s = new ShardingTest({shards: 2});
var db = s.getDB("test");
var admin = s.getDB("admin");
var config = s.getDB("config");
var shards = config.shards.find().toArray();
var shard0 = new Mongo(shards[0].host);
var shard1 = new Mongo(shards[1].host);
assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', 'shard0001');
//******************Part 1********************
var coll = db.foo;
var longStr = 'a';
while (longStr.length < 1024 * 128) {
longStr += longStr;
}
var bulk = coll.initializeUnorderedBulkOp();
for (i = 0; i < 100; i++) {
bulk.insert({num: i, str: longStr});
bulk.insert({num: i + 100, x: i, str: longStr});
}
assert.writeOK(bulk.execute());
// no usable index yet, should throw
assert.throws(function() {
s.adminCommand({shardCollection: coll.getFullName(), key: {num: 1}});
});
// create usable index
assert.commandWorked(coll.ensureIndex({num: 1, x: 1}));
// usable index, but doc with empty 'num' value, so still should throw
assert.writeOK(coll.insert({x: -5}));
assert.throws(function() {
s.adminCommand({shardCollection: coll.getFullName(), key: {num: 1}});
});
// remove the bad doc. now should finally succeed
assert.writeOK(coll.remove({x: -5}));
assert.commandWorked(s.s0.adminCommand({shardCollection: coll.getFullName(), key: {num: 1}}));
// make sure extra index is not created
assert.eq(2, coll.getIndexes().length);
// make sure balancing happens
s.awaitBalance(coll.getName(), db.getName());
// Make sure our initial balance cleanup doesn't interfere with later migrations.
assert.soon(function() {
print("Waiting for migration cleanup to occur...");
return coll.count() == coll.find().itcount();
});
s.stopBalancer();
// test splitting
assert.commandWorked(s.s0.adminCommand({split: coll.getFullName(), middle: {num: 50}}));
// test moving
assert.commandWorked(s.s0.adminCommand({
movechunk: coll.getFullName(),
find: {num: 20},
to: s.getOther(s.getPrimaryShard("test")).name,
_waitForDelete: true
}));
//******************Part 2********************
// Migrations and splits will still work on a sharded collection that only has multi key
// index.
db.user.ensureIndex({num: 1, x: 1});
db.adminCommand({shardCollection: 'test.user', key: {num: 1}});
var indexCount = db.user.getIndexes().length;
assert.eq(2,
indexCount, // indexes for _id_ and num_1_x_1
'index count not expected: ' + tojson(db.user.getIndexes()));
var array = [];
for (var item = 0; item < 50; item++) {
array.push(item);
}
for (var docs = 0; docs < 1000; docs++) {
db.user.insert({num: docs, x: array});
}
assert.eq(1000, db.user.find().itcount());
assert.commandWorked(admin.runCommand({
movechunk: 'test.user',
find: {num: 70},
to: s.getOther(s.getPrimaryShard("test")).name,
_waitForDelete: true
}));
var expectedShardCount = {
shard0000: 0,
shard0001: 0
};
config.chunks.find({ns: 'test.user'})
.forEach(function(chunkDoc) {
var min = chunkDoc.min.num;
var max = chunkDoc.max.num;
if (min < 0 || min == MinKey) {
min = 0;
}
if (max > 1000 || max == MaxKey) {
max = 1000;
}
if (max > 0) {
expectedShardCount[chunkDoc.shard] += (max - min);
}
});
assert.eq(expectedShardCount['shard0000'], shard0.getDB('test').user.find().count());
assert.eq(expectedShardCount['shard0001'], shard1.getDB('test').user.find().count());
assert.commandWorked(admin.runCommand({split: 'test.user', middle: {num: 70}}));
assert.eq(expectedShardCount['shard0000'], shard0.getDB('test').user.find().count());
assert.eq(expectedShardCount['shard0001'], shard1.getDB('test').user.find().count());
//******************Part 3********************
// Check chunk boundaries obeyed when using prefix shard key.
// This test repeats with shard key as the prefix of different longer indices.
for (i = 0; i < 3; i++) {
// setup new collection on shard0
var coll2 = db.foo2;
coll2.drop();
if (s.getPrimaryShardIdForDatabase(coll2.getDB()) != shards[0]._id) {
var moveRes = admin.runCommand({movePrimary: coll2.getDB() + "", to: shards[0]._id});
assert.eq(moveRes.ok, 1, "primary not moved correctly");
}
// declare a longer index
if (i == 0) {
assert.commandWorked(coll2.ensureIndex({skey: 1, extra: 1}));
} else if (i == 1) {
assert.commandWorked(coll2.ensureIndex({skey: 1, extra: -1}));
} else if (i == 2) {
assert.commandWorked(coll2.ensureIndex({skey: 1, extra: 1, superfluous: -1}));
}
// then shard collection on prefix
var shardRes = admin.runCommand({shardCollection: coll2 + "", key: {skey: 1}});
assert.eq(shardRes.ok, 1, "collection not sharded");
// insert docs with same value for skey
bulk = coll2.initializeUnorderedBulkOp();
for (var i = 0; i < 5; i++) {
for (var j = 0; j < 5; j++) {
bulk.insert({skey: 0, extra: i, superfluous: j});
}
}
assert.writeOK(bulk.execute());
// split on that key, and check it makes 2 chunks
var splitRes = admin.runCommand({split: coll2 + "", middle: {skey: 0}});
assert.eq(splitRes.ok, 1, "split didn't work");
assert.eq(config.chunks.find({ns: coll2.getFullName()}).count(), 2);
// movechunk should move ALL docs since they have same value for skey
moveRes = admin.runCommand(
{moveChunk: coll2 + "", find: {skey: 0}, to: shards[1]._id, _waitForDelete: true});
assert.eq(moveRes.ok, 1, "movechunk didn't work");
// Make sure our migration eventually goes through before testing individual shards
assert.soon(function() {
print("Waiting for migration cleanup to occur...");
return coll2.count() == coll2.find().itcount();
});
// check no orphaned docs on the shards
assert.eq(0, shard0.getCollection(coll2 + "").find().itcount());
assert.eq(25, shard1.getCollection(coll2 + "").find().itcount());
// and check total
assert.eq(25, coll2.find().itcount(), "bad total number of docs after move");
s.printShardingStatus();
}
s.stop();
})();
|
