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// Tests the behavior of an $out stage which encounters an error in the middle of processing. We
// don't guarantee any particular behavior in this scenario, but this test exists to make sure
// nothing horrendous happens and to characterize the current behavior.
// @tags: [assumes_unsharded_collection]
(function() {
"use strict";
load("jstests/aggregation/extras/utils.js"); // For assertErrorCode.
const coll = db.batch_writes;
const outColl = db.batch_writes_out;
coll.drop();
outColl.drop();
// Test with 2 very large documents that do not fit into a single batch.
const kSize15MB = 15 * 1024 * 1024;
const largeArray = new Array(kSize15MB).join("a");
assert.commandWorked(coll.insert({_id: 0, a: largeArray}));
assert.commandWorked(coll.insert({_id: 1, a: largeArray}));
// Make sure the $out succeeds without any duplicate keys.
["replaceCollection", "insertDocuments", "replaceDocuments"].forEach(mode => {
coll.aggregate([{$out: {to: outColl.getName(), mode: mode}}]);
assert.eq(2, outColl.find().itcount());
outColl.drop();
});
coll.drop();
for (let i = 0; i < 10; i++) {
assert.commandWorked(coll.insert({_id: i, a: i}));
}
// Create a unique index on 'a' in the output collection to create a unique key violation when
// running the $out. The second document to be written ({_id: 1, a: 1}) will conflict with the
// existing document in the output collection. We use a unique index on a field other than _id
// because "replaceDocuments" mode will not change _id when one already exists.
outColl.drop();
assert.commandWorked(outColl.insert({_id: 2, a: 1}));
assert.commandWorked(outColl.createIndex({a: 1}, {unique: true}));
// Test that both batched updates and inserts will successfully write the first document but
// fail on the second. We don't guarantee any particular behavior in this case, but this test is
// meant to characterize the current behavior.
["insertDocuments", "replaceDocuments"].forEach(mode => {
assertErrorCode(
coll, [{$out: {to: outColl.getName(), mode: mode}}], ErrorCodes.DuplicateKey);
assert.soon(() => {
return outColl.find().itcount() == 2;
});
});
// Mode "replaceCollection" will drop the contents of the output collection, so there is no
// duplicate key error.
outColl.drop();
assert.commandWorked(outColl.insert({_id: 2, a: 1}));
assert.commandWorked(outColl.createIndex({a: 1}, {unique: true}));
coll.aggregate([{$out: {to: outColl.getName(), mode: "replaceCollection"}}]);
assert.eq(10, outColl.find().itcount());
}());
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