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'use strict';
/**
* update_simple.js
*
* Creates several docs. On each iteration, each thread chooses:
* - a random doc
* - whether to $set or $unset its field
* - what value to $set the field to
*/
// For isMongod and supportsDocumentLevelConcurrency.
load('jstests/concurrency/fsm_workload_helpers/server_types.js');
var $config = (function() {
var states = {
set: function set(db, collName) {
this.setOrUnset(db, collName, true, this.numDocs);
},
unset: function unset(db, collName) {
this.setOrUnset(db, collName, false, this.numDocs);
}
};
var transitions = {
set: {set: 0.5, unset: 0.5},
unset: {set: 0.5, unset: 0.5}
};
function setup(db, collName, cluster) {
// index on 'value', the field being updated
assertAlways.commandWorked(db[collName].ensureIndex({value: 1}));
// numDocs should be much less than threadCount, to make more threads use the same docs.
this.numDocs = Math.floor(this.threadCount / 5);
assertAlways.gt(this.numDocs, 0, 'numDocs should be a positive number');
for (var i = 0; i < this.numDocs; ++i) {
// make sure the inserted docs have a 'value' field, so they won't need
// to grow when this workload runs against a capped collection
var res = db[collName].insert({_id: i, value: 0});
assertWhenOwnColl.writeOK(res);
assertWhenOwnColl.eq(1, res.nInserted);
}
}
return {
threadCount: 20,
iterations: 20,
startState: 'set',
states: states,
transitions: transitions,
data: {
// explicitly pass db to avoid accidentally using the global `db`
assertResult: function assertResult(db, res) {
assertAlways.eq(0, res.nUpserted, tojson(res));
if (isMongod(db) && supportsDocumentLevelConcurrency(db)) {
// Storage engines which support document-level concurrency will automatically
// retry any operations when there are conflicts, so we should always see a
// matching document.
assertWhenOwnColl.eq(res.nMatched, 1, tojson(res));
} else {
// On storage engines that do not support document-level concurrency, it is
// possible that the query will not find the document. This can happen if
// another thread updated the target document during a yield, triggering an
// invalidation.
assertWhenOwnColl.contains(res.nMatched, [0, 1], tojson(res));
}
// We can't be sure nModified will be non-zero because we may have just set a key to
// its existing value
if (db.getMongo().writeMode() === 'commands') {
assertWhenOwnColl.contains(res.nModified, [0, 1], tojson(res));
}
},
setOrUnset: function setOrUnset(db, collName, set, numDocs) {
// choose a doc and value to use in the update
var docIndex = Random.randInt(numDocs);
var value = Random.randInt(5);
var updater = {};
updater[set ? '$set' : '$unset'] = {
value: value
};
var query = {
_id: docIndex
};
var res = this.doUpdate(db, collName, query, updater);
this.assertResult(db, res);
},
doUpdate: function doUpdate(db, collName, query, updater) {
return db[collName].update(query, updater);
},
},
setup: setup
};
})();
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