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/**
* Tests that non-transactional operations run concurrently with a transaction on the same session
* are non-transactional, and do not see or affect any transaction state. This test avoids using
* shell helpers to not inherit transaction state.
*
* @tags: [uses_transactions, uses_snapshot_read_concern]
*/
(function() {
"use strict";
const dbName = "test";
const collName = "non_transactional_operations_on_session_with_transactions";
const testDB = db.getSiblingDB(dbName);
const testColl = testDB[collName];
// Clean up and create test collection.
testDB.runCommand({drop: collName, writeConcern: {w: "majority"}});
assert.commandWorked(testDB.runCommand({create: collName, writeConcern: {w: "majority"}}));
const sessionOptions = {causalConsistency: false};
const session = db.getMongo().startSession(sessionOptions);
const sessionDb = session.getDatabase(dbName);
const sessionColl = sessionDb[collName];
let txnNumber = 0;
/**
* Asserts that the given result cursor has the expected contents and that it is exhausted if
* specified.
*/
function assertCursorBatchContents(result, expectedContents, isExhausted) {
assert.gt(expectedContents.length, 0, "Non-empty expected contents required.");
assert(result.hasOwnProperty("cursor"), tojson(result));
assert(result["cursor"].hasOwnProperty("firstBatch"), tojson(result));
assert.eq(expectedContents.length, result["cursor"]["firstBatch"].length, tojson(result));
for (let i = 0; i < expectedContents.length; i++) {
assert.docEq(expectedContents[i], result["cursor"]["firstBatch"][i], tojson(result));
}
assert.eq(isExhausted, result["cursor"]["id"] === 0, tojson(result));
}
const doc1 = {_id: "insert-1"};
const doc2 = {_id: "insert-2"};
// Insert a document in a transaction.
assert.commandWorked(sessionDb.runCommand({
insert: collName,
documents: [doc1],
readConcern: {level: "snapshot"},
txnNumber: NumberLong(txnNumber),
startTransaction: true,
autocommit: false
}));
// Test that we cannot observe the insert outside of the transaction.
assert.eq(null, testColl.findOne(doc1));
assert.eq(null, sessionColl.findOne(doc1));
assert.eq(null, testColl.findOne(doc2));
assert.eq(null, sessionColl.findOne(doc2));
// Test that we observe the insert inside of the transaction.
assertCursorBatchContents(
assert.commandWorked(sessionDb.runCommand(
{find: collName, batchSize: 10, txnNumber: NumberLong(txnNumber), autocommit: false})),
[doc1],
false);
// Insert a document on the session outside of the transaction.
assert.commandWorked(sessionDb.runCommand({insert: collName, documents: [doc2]}));
// Test that we observe the insert outside of the transaction.
assert.eq(null, testColl.findOne(doc1));
assert.eq(null, sessionColl.findOne(doc1));
assert.docEq(doc2, testColl.findOne(doc2));
assert.docEq(doc2, sessionColl.findOne(doc2));
// Test that we do not observe the new insert inside of the transaction.
assertCursorBatchContents(
assert.commandWorked(sessionDb.runCommand(
{find: collName, batchSize: 10, txnNumber: NumberLong(txnNumber), autocommit: false})),
[doc1],
false);
// Commit the transaction.
assert.commandWorked(sessionDb.adminCommand({
commitTransaction: 1,
writeConcern: {w: "majority"},
txnNumber: NumberLong(txnNumber),
autocommit: false
}));
// Test that we see both documents outside of the transaction.
assert.docEq(doc1, testColl.findOne(doc1));
assert.docEq(doc1, sessionColl.findOne(doc1));
assert.docEq(doc2, testColl.findOne(doc2));
assert.docEq(doc2, sessionColl.findOne(doc2));
}());
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