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'use strict';
/**
* map_reduce_replace.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 an existing
* collection.
*
* Uses the "replace" action to overwrite the entire contents of the
* collection.
*/
load('jstests/concurrency/fsm_libs/extend_workload.js'); // for extendWorkload
load('jstests/concurrency/fsm_workloads/map_reduce_inline.js'); // for $config
load('jstests/concurrency/fsm_workload_helpers/drop_utils.js'); // for dropCollections
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';
function uniqueCollectionName(prefix, tid) {
return prefix + tid;
}
$config.states.init = function init(db, collName) {
$super.states.init.apply(this, arguments);
this.outCollName = uniqueCollectionName(prefix, this.tid);
assertAlways.commandWorked(db.createCollection(this.outCollName));
};
$config.states.mapReduce = function mapReduce(db, collName) {
var fullName = db[this.outCollName].getFullName();
assertAlways(db[this.outCollName].exists() !== null,
"output collection '" + fullName + "' should exist");
var options = {
finalize: this.finalizer,
out: { replace: this.outCollName },
query: { key: { $exists: true }, value: { $exists: true } },
sort: { _id: -1 } // sort key must be an existing index
};
var res = db[collName].mapReduce(this.mapper, this.reducer, options);
assertAlways.commandWorked(res);
};
$config.teardown = function teardown(db, collName, cluster) {
var pattern = new RegExp('^' + prefix + '\\d+$');
dropCollections(db, pattern);
};
return $config;
});
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