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// SERVER-16262: Write-conflict during map-reduce operations
(function() {
"use strict";
load('jstests/libs/parallelTester.js');
var makeDoc = function(keyLimit, valueLimit) {
return {
_id: ObjectId(),
key: Random.randInt(keyLimit),
value: Random.randInt(valueLimit)
};
};
var main = function() {
function mapper() {
var obj = {};
obj[this.value] = 1;
emit(this.key, obj);
}
function reducer(key, values) {
var res = {};
values.forEach(function(obj) {
Object.keys(obj).forEach(function(value) {
if (!res.hasOwnProperty(value)) {
res[value] = 0;
}
res[value] += obj[value];
});
});
return res;
}
for (var i = 0; i < 10; i++) {
// Have all threads combine their results into the same collection
var res = db.source.mapReduce(mapper, reducer, { out: { reduce: 'dest' } });
assert.commandWorked(res);
}
};
Random.setRandomSeed();
var numDocs = 200;
var bulk = db.source.initializeUnorderedBulkOp();
var i;
for (i = 0; i < numDocs; ++i) {
var doc = makeDoc(numDocs / 100, numDocs / 10);
bulk.insert(doc);
}
var res = bulk.execute();
assert.writeOK(res);
assert.eq(numDocs, res.nInserted);
db.dest.drop();
assert.commandWorked(db.createCollection('dest'));
var numThreads = 6;
var t = [];
for (i = 0; i < numThreads - 1; ++i) {
t[i] = new ScopedThread(main);
t[i].start();
}
main();
for (i = 0; i < numThreads - 1; ++i) {
t[i].join();
}
}());
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