summaryrefslogtreecommitdiff
path: root/jstests/sharding/zbigMapReduce.js
blob: dcd3b93fb71a9590c1da10d2f26aa271960f3a3b (plain)
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
/**
 * This test is labeled resource intensive because its total io_write is 625MB compared to a median
 * of 5MB across all sharding tests in wiredTiger.
 * @tags: [resource_intensive]
 */
(function() {
'use strict';

let s = new ShardingTest({
    shards: 2,
    mongos: 1,
    other: {
        rs: true,
        numReplicas: 2,
        chunkSize: 1,
        rsOptions: {oplogSize: 50},
        enableAutoSplit: true,
    }
});

assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', s.shard0.shardName);
assert.commandWorked(s.s0.adminCommand({shardcollection: "test.foo", key: {"_id": 1}}));

let testDb = s.getDB("test");

jsTest.log("Inserting a lot of documents into test.foo");

// Make each document data to be 5K so that the total size is ~250MB
const str = "#".repeat(5 * 1024);

var idInc = 0;
var valInc = 0;

var bulk = testDb.foo.initializeUnorderedBulkOp();
for (var j = 0; j < 100; j++) {
    for (var i = 0; i < 512; i++) {
        bulk.insert({i: idInc++, val: valInc++, y: str});
    }
}
assert.writeOK(bulk.execute({w: 2, wtimeout: 10 * 60 * 1000}));

jsTest.log("Documents inserted, doing double-checks of insert...");

// Collect some useful stats to figure out what happened
if (testDb.foo.find().itcount() != 51200) {
    s.printShardingStatus(true);

    print("Shard 0: " + s.shard0.getCollection(testDb.foo + "").find().itcount());
    print("Shard 1: " + s.shard1.getCollection(testDb.foo + "").find().itcount());

    for (var i = 0; i < 51200; i++) {
        if (!testDb.foo.findOne({i: i}, {i: 1})) {
            print("Could not find: " + i);
        }

        if (i % 100 == 0)
            print("Checked " + i);
    }

    assert(false, 'Incorect number of chunks found!');
}

s.printChunks(testDb.foo.getFullName());
s.printChangeLog();

function map() {
    emit('count', 1);
}
function reduce(key, values) {
    return Array.sum(values);
}

// Let chunks move around while map reduce is running
s.startBalancer();

jsTest.log("Test basic mapreduce...");

// Test basic mapReduce
for (var iter = 0; iter < 5; iter++) {
    print("Test #" + iter);
    testDb.foo.mapReduce(map, reduce, "big_out");
}

print("Testing output to different db...");

// Test output to a different DB - do it multiple times so that the merging shard changes
for (var iter = 0; iter < 5; iter++) {
    print("Test #" + iter);

    assert.eq(51200, testDb.foo.find().itcount(), "Not all data was found!");

    let outCollStr = "mr_replace_col_" + iter;
    let outDbStr = "mr_db_" + iter;

    print("Testing mr replace into DB " + iter);

    var res = testDb.foo.mapReduce(map, reduce, {out: {replace: outCollStr, db: outDbStr}});
    printjson(res);

    var outDb = s.getDB(outDbStr);
    var outColl = outDb[outCollStr];

    var obj = outColl.convertToSingleObject("value");
    assert.eq(51200, obj.count, "Received wrong result " + obj.count);

    print("Checking result field");
    assert.eq(res.result.collection, outCollStr, "Wrong collection " + res.result.collection);
    assert.eq(res.result.db, outDbStr, "Wrong db " + res.result.db);
}

jsTest.log("Verifying nonatomic M/R throws...");

// Check nonAtomic output
assert.throws(function() {
    testDb.foo.mapReduce(map, reduce, {out: {replace: "big_out", nonAtomic: true}});
});

jsTest.log("Adding documents");

// Add docs with dup "i"
valInc = 0;
for (var j = 0; j < 100; j++) {
    print("Inserted document: " + (j * 100));
    var bulk = testDb.foo.initializeUnorderedBulkOp();
    for (i = 0; i < 512; i++) {
        bulk.insert({i: idInc++, val: valInc++, y: str});
    }
    assert.writeOK(bulk.execute({w: 2, wtimeout: 10 * 60 * 1000}));
}

jsTest.log("No errors...");

function map2() {
    emit(this.val, 1);
}
function reduce2(key, values) {
    return Array.sum(values);
}

// Test merge
let outColMerge = 'big_out_merge';

// M/R quarter of the docs
{
    jsTestLog("Test A");
    var out =
        testDb.foo.mapReduce(map2, reduce2, {query: {i: {$lt: 25600}}, out: {merge: outColMerge}});
    printjson(out);
    assert.eq(25600, out.counts.emit, "Received wrong result");
    assert.eq(25600, out.counts.output, "Received wrong result");
}

// M/R further docs
{
    jsTestLog("Test B");
    var out = testDb.foo.mapReduce(
        map2, reduce2, {query: {i: {$gte: 25600, $lt: 51200}}, out: {merge: outColMerge}});
    printjson(out);
    assert.eq(25600, out.counts.emit, "Received wrong result");
    assert.eq(51200, out.counts.output, "Received wrong result");
}

// M/R do 2nd half of docs
{
    jsTestLog("Test C");
    var out = testDb.foo.mapReduce(
        map2, reduce2, {query: {i: {$gte: 51200}}, out: {merge: outColMerge, nonAtomic: true}});
    printjson(out);
    assert.eq(51200, out.counts.emit, "Received wrong result");
    assert.eq(51200, out.counts.output, "Received wrong result");
    assert.eq(1, testDb[outColMerge].findOne().value, "Received wrong result");
}

// Test reduce
let outColReduce = "big_out_reduce";

// M/R quarter of the docs
{
    jsTestLog("Test D");
    var out = testDb.foo.mapReduce(
        map2, reduce2, {query: {i: {$lt: 25600}}, out: {reduce: outColReduce}});
    printjson(out);
    assert.eq(25600, out.counts.emit, "Received wrong result");
    assert.eq(25600, out.counts.output, "Received wrong result");
}

// M/R further docs
{
    jsTestLog("Test E");
    var out = testDb.foo.mapReduce(
        map2, reduce2, {query: {i: {$gte: 25600, $lt: 51200}}, out: {reduce: outColReduce}});
    printjson(out);
    assert.eq(25600, out.counts.emit, "Received wrong result");
    assert.eq(51200, out.counts.output, "Received wrong result");
}

// M/R do 2nd half of docs
{
    jsTestLog("Test F");
    var out = testDb.foo.mapReduce(
        map2, reduce2, {query: {i: {$gte: 51200}}, out: {reduce: outColReduce, nonAtomic: true}});
    printjson(out);
    assert.eq(51200, out.counts.emit, "Received wrong result");
    assert.eq(51200, out.counts.output, "Received wrong result");
    assert.eq(2, testDb[outColReduce].findOne().value, "Received wrong result");
}

// Verify that data is also on secondary
{
    jsTestLog("Test G");
    var primary = s.rs0._master;
    var secondaries = s.rs0._slaves;

    // Stop the balancer to prevent new writes from happening and make sure that replication can
    // keep up even on slow machines
    s.stopBalancer();
    s.rs0.awaitReplication();
    assert.eq(51200, primary.getDB("test")[outColReduce].find().itcount(), "Wrong count");

    for (var i = 0; i < secondaries.length; ++i) {
        assert.eq(
            51200, secondaries[i].getDB("test")[outColReduce].find().itcount(), "Wrong count");
    }
}

s.stop();
})();