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// Test several different kinds of size limits on user-defined (Javascript) accumulators.
(function() {
"use strict";
const coll = db.accumulator_js_size_limits;
function runExample(groupKey, accumulatorSpec) {
return coll.runCommand({
aggregate: coll.getName(),
cursor: {},
pipeline: [{
$group: {
_id: groupKey,
accumulatedField: {$accumulator: accumulatorSpec},
}
}]
});
}
// Accumulator tries to create too long a String; it can't be serialized to BSON.
coll.drop();
assert.commandWorked(coll.insert({}));
let res = runExample(1, {
init: function() {
return "a".repeat(20 * 1024 * 1024);
},
accumulate: function() {
throw 'accumulate should not be called';
},
accumulateArgs: [],
merge: function() {
throw 'merge should not be called';
},
finalize: function() {
throw 'finalize should not be called';
},
lang: 'js',
});
assert.commandFailedWithCode(res, [10334]);
// Accumulator tries to return BSON larger than 16MB from JS.
assert(coll.drop());
assert.commandWorked(coll.insert({}));
res = runExample(1, {
init: function() {
const str = "a".repeat(1 * 1024 * 1024);
return Array.from({length: 20}, () => str);
},
accumulate: function() {
throw 'accumulate should not be called';
},
accumulateArgs: [],
merge: function() {
throw 'merge should not be called';
},
finalize: function() {
throw 'finalize should not be called';
},
lang: 'js',
});
assert.commandFailedWithCode(res, [17260]);
// $group size limit exceeded, and cannot spill.
assert(coll.drop());
assert.commandWorked(coll.insert(Array.from({length: 200}, (_, i) => ({_id: i}))));
// By grouping on _id, each group contains only 1 document. This means it creates many
// AccumulatorState instances.
res = runExample("$_id", {
init: function() {
// Each accumulator state is big enough to be expensive, but not big enough to hit the BSON
// size limit.
return "a".repeat(1 * 1024 * 1024);
},
accumulate: function(state) {
return state;
},
accumulateArgs: [1],
merge: function(state1, state2) {
return state1;
},
finalize: function(state) {
return state.length;
},
lang: 'js',
});
assert.commandFailedWithCode(res, [16945]);
})();
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