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'use strict';
/**
* drop_collection.js
*
* Repeatedly creates and drops a collection.
*/
var $config = (function() {
var data = {
// Use the workload name as a prefix for the collection name,
// since the workload name is assumed to be unique.
prefix: 'drop_collection'
};
var states = (function() {
function uniqueCollectionName(prefix, tid, num) {
return prefix + tid + '_' + num;
}
function init(db, collName) {
this.num = 0;
}
function createAndDrop(db, collName) {
// TODO: should we ever do something different?
var myCollName = uniqueCollectionName(this.prefix, this.tid, this.num++);
assertAlways.commandWorked(db.createCollection(myCollName));
assertAlways(db[myCollName].drop());
}
return {init: init, createAndDrop: createAndDrop};
})();
var transitions = {init: {createAndDrop: 1}, createAndDrop: {createAndDrop: 1}};
// This test performs dropCollection concurrently from many threads, and dropCollection on a
// sharded cluster takes a distributed lock. Since a distributed lock is acquired by repeatedly
// attempting to grab the lock every half second for 20 seconds (a max of 40 attempts), it's
// possible that some thread will be starved by the other threads and fail to grab the lock
// after 40 attempts. To reduce the likelihood of this, we choose threadCount and iterations so
// that threadCount * iterations < 40.
// The threadCount and iterations can be increased once PM-697 ("Remove all usages of
// distributed lock") is complete.
return {threadCount: 5, iterations: 5, data: data, states: states, transitions: transitions};
})();
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