60 lines
2.7 KiB
JavaScript
60 lines
2.7 KiB
JavaScript
// Tests the behavior of an $out stage which encounters an error in the middle of processing. We
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// don't guarantee any particular behavior in this scenario, but this test exists to make sure
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// nothing horrendous happens and to characterize the current behavior.
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// @tags: [assumes_unsharded_collection]
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(function() {
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"use strict";
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load("jstests/aggregation/extras/utils.js"); // For assertErrorCode.
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const coll = db.batch_writes;
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const outColl = db.batch_writes_out;
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coll.drop();
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outColl.drop();
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// Test with 2 very large documents that do not fit into a single batch.
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const kSize15MB = 15 * 1024 * 1024;
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const largeArray = new Array(kSize15MB).join("a");
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assert.commandWorked(coll.insert({_id: 0, a: largeArray}));
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assert.commandWorked(coll.insert({_id: 1, a: largeArray}));
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// Make sure the $out succeeds without any duplicate keys.
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["replaceCollection", "insertDocuments", "replaceDocuments"].forEach(mode => {
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coll.aggregate([{$out: {to: outColl.getName(), mode: mode}}]);
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assert.eq(2, outColl.find().itcount());
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outColl.drop();
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});
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coll.drop();
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for (let i = 0; i < 10; i++) {
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assert.commandWorked(coll.insert({_id: i, a: i}));
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}
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// Create a unique index on 'a' in the output collection to create a unique key violation when
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// running the $out. The second document to be written ({_id: 1, a: 1}) will conflict with the
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// existing document in the output collection. We use a unique index on a field other than _id
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// because "replaceDocuments" mode will not change _id when one already exists.
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outColl.drop();
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assert.commandWorked(outColl.insert({_id: 2, a: 1}));
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assert.commandWorked(outColl.createIndex({a: 1}, {unique: true}));
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// Test that the writes for $out are unordered, meaning the operation continues even if it
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// encounters a duplicate key error. We don't guarantee any particular behavior in this case,
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// but this test is meant to characterize the current behavior.
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["insertDocuments", "replaceDocuments"].forEach(mode => {
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assertErrorCode(
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coll, [{$out: {to: outColl.getName(), mode: mode}}], ErrorCodes.DuplicateKey);
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assert.soon(() => {
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return outColl.find().itcount() == 9;
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});
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});
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// Mode "replaceCollection" will drop the contents of the output collection, so there is no
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// duplicate key error.
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outColl.drop();
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assert.commandWorked(outColl.insert({_id: 2, a: 1}));
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assert.commandWorked(outColl.createIndex({a: 1}, {unique: true}));
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coll.aggregate([{$out: {to: outColl.getName(), mode: "replaceCollection"}}]);
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assert.eq(10, outColl.find().itcount());
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}());
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