jstests/concurrency/fsm_workloads/map_reduce_replace_nonexistent.js


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

'use strict';

/**
 * map_reduce_replace_nonexistent.js
 *
 * Generates some random data and inserts it into a collection. Runs a
 * map-reduce command over the collection that computes the frequency
 * counts of the 'value' field and stores the results in a new collection.
 *
 * Uses the "replace" action to write the results to a nonexistent
 * output collection.
 */
load('jstests/concurrency/fsm_libs/extend_workload.js');         // for extendWorkload
load('jstests/concurrency/fsm_workloads/map_reduce_inline.js');  // for $config

var $config = extendWorkload($config, function($config, $super) {

    // Use the workload name as a prefix for the collection name,
    // since the workload name is assumed to be unique.
    var prefix = 'map_reduce_replace_nonexistent';

    function uniqueCollectionName(prefix, tid) {
        return prefix + tid;
    }

    $config.states.mapReduce = function mapReduce(db, collName) {
        var outCollName = uniqueCollectionName(prefix, this.tid);
        var fullName = db[outCollName].getFullName();
        assertAlways.isnull(db[outCollName].exists(),
                            "output collection '" + fullName + "' should not exist");

        var options = {
            finalize: this.finalizer,
            out: {replace: outCollName},
            query: {key: {$exists: true}, value: {$exists: true}}
        };

        var res = db[collName].mapReduce(this.mapper, this.reducer, options);
        assertAlways.commandWorked(res);
        assertAlways(db[outCollName].drop());
    };

    return $config;
});