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'use strict';
/**
* drop_index_during_lookup.js
*
* Sets up a situation where index join strategy will be chosen for $lookup while while running
* concurrent dropIndexes against the index chosen for the foreign side.
*/
var $config = (function() {
let data = {
collName: 'localColl',
foreignCollName: 'foreignColl',
};
let states = {
lookup: function lookup(db, collName) {
try {
const coll = db[this.collName];
const result = coll.aggregate([{$lookup: { from: this.foreignCollName, localField: 'a', foreignField: 'b', as: 'out'}}]).toArray();
assert.eq(result.length, 1);
assert.docEq({_id: 0, a: 0, out: [{_id: 0, b: 0}]}, result[0]);
} catch (e) {
// We expect any errors of query getting killed due to selected index for join is
// dropped.
assertAlways.eq(e.code, ErrorCodes.QueryPlanKilled);
}
},
dropIndex: function dropIndex(db, collName) {
// We don't assert that the command succeeded when dropping an index because it's
// possible another thread has already dropped this index.
db[this.foreignCollName].dropIndex({b: 1});
// Recreate the index that was dropped.
assertAlways.commandWorkedOrFailedWithCode(db[this.foreignCollName].createIndex({b: 1}),
[
ErrorCodes.IndexBuildAborted,
ErrorCodes.NoMatchingDocument,
]);
}
};
let transitions = {lookup: {lookup: 0.8, dropIndex: 0.2}, dropIndex: {lookup: 1}};
function setup(db, collName, cluster) {
assertAlways.commandWorked(db[this.collName].insert({_id: 0, a: 0}));
assertAlways.commandWorked(db[this.foreignCollName].insert({_id: 0, b: 0}));
assertAlways.commandWorked(db[this.foreignCollName].createIndex({b: 1}));
}
return {
threadCount: 10,
iterations: 50,
data: data,
states: states,
startState: 'lookup',
transitions: transitions,
setup: setup
};
})();
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