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'use strict';
/**
* findAndModify_inc.js
*
* Inserts a single document into a collection. Each thread performs a
* findAndModify command to select the document and increment a particular
* field. Asserts that the field has the correct value based on the number
* of increments performed.
*
* This workload was designed to reproduce SERVER-15892.
*/
// For isMongod and supportsDocumentLevelConcurrency.
load('jstests/concurrency/fsm_workload_helpers/server_types.js');
var $config = (function() {
let data = {
getUpdateArgument: function(fieldName) {
return {$inc: {[fieldName]: 1}};
},
};
var states = {
init: function init(db, collName) {
this.fieldName = 't' + this.tid;
this.count = 0;
},
update: function update(db, collName) {
var updateDoc = this.getUpdateArgument(this.fieldName);
var res = db.runCommand(
{findAndModify: collName, query: {_id: 'findAndModify_inc'}, update: updateDoc});
assertAlways.commandWorked(res);
// If the document was invalidated during a yield, then we wouldn't have modified it.
// The "findAndModify" command returns a null value in this case. See SERVER-22002 for
// more details.
if (isMongod(db) && supportsDocumentLevelConcurrency(db)) {
// For storage engines that support document-level concurrency, if the document is
// modified by another thread during a yield, then the operation is retried
// internally. We never expect to see a null value returned by the "findAndModify"
// command when it is known that a matching document exists in the collection.
assertWhenOwnColl(res.value !== null, 'query spec should have matched a document');
}
if (res.value !== null) {
++this.count;
}
},
find: function find(db, collName) {
var docs = db[collName].find().toArray();
assertWhenOwnColl.eq(1, docs.length);
assertWhenOwnColl(() => {
var doc = docs[0];
if (doc.hasOwnProperty(this.fieldName)) {
assertWhenOwnColl.eq(this.count, doc[this.fieldName]);
} else {
assertWhenOwnColl.eq(this.count, 0);
}
});
}
};
var transitions = {init: {update: 1}, update: {find: 1}, find: {update: 1}};
function setup(db, collName, cluster) {
const doc = {_id: 'findAndModify_inc'};
// Initialize the fields used to a count of 0.
for (let i = 0; i < this.threadCount; ++i) {
doc['t' + i] = 0;
}
db[collName].insert(doc);
}
return {
threadCount: 20,
iterations: 20,
data: data,
states: states,
transitions: transitions,
setup: setup
};
})();
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