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/**
* Tests that initial sync successfully applies the commitTransaction oplog entry. To be able to
* test this, we have to pause collection cloning and run commitTransaction so that the oplog entry
* is applied during the oplog application phase of initial sync.
*
* @tags: [uses_transactions, uses_prepare_transaction]
*/
(function() {
"use strict";
load("jstests/libs/check_log.js");
load("jstests/core/txns/libs/prepare_helpers.js");
const replTest = new ReplSetTest({nodes: 2});
replTest.startSet();
const config = replTest.getReplSetConfig();
// Increase the election timeout so that we do not accidentally trigger an election while the
// secondary is restarting.
config.settings = {"electionTimeoutMillis": 12 * 60 * 60 * 1000};
replTest.initiate(config);
const primary = replTest.getPrimary();
let secondary = replTest.getSecondary();
const dbName = "test";
const collName = "initial_sync_commit_prepared_transaction";
const testDB = primary.getDB(dbName);
const testColl = testDB.getCollection(collName);
assert.commandWorked(testColl.insert({_id: 1}));
jsTestLog("Preparing a transaction that will be the oldest active transaction");
// Prepare a transaction so that there is an active transaction with an oplog entry. The prepare
// timestamp will become the beginFetchingTimestamp during initial sync.
const session1 = primary.startSession({causalConsistency: false});
const sessionDB1 = session1.getDatabase(dbName);
const sessionColl1 = sessionDB1.getCollection(collName);
session1.startTransaction();
assert.commandWorked(sessionColl1.insert({_id: 2}));
let prepareTimestamp1 = PrepareHelpers.prepareTransaction(session1);
// Do another operation so that the beginFetchingTimestamp will be different from the
// beginApplyingTimestamp.
assert.commandWorked(testColl.insert({_id: 3}));
jsTestLog("Restarting the secondary");
// Restart the secondary with startClean set to true so that it goes through initial sync. Also
// restart the node with a failpoint turned on that will pause initial sync after the secondary
// has copied {_id: 1} and {_id: 3}. This way we can try to commit the prepared transaction
// while initial sync is paused and know that its operations won't be copied during collection
// cloning. Instead, the commitTransaction oplog entry must be applied during oplog application.
replTest.stop(secondary,
// signal
undefined,
// Validation would encounter a prepare conflict on the open transaction.
{skipValidation: true});
secondary = replTest.start(
secondary,
{
startClean: true,
setParameter: {
'failpoint.initialSyncHangDuringCollectionClone': tojson(
{mode: 'alwaysOn', data: {namespace: testColl.getFullName(), numDocsToClone: 2}}),
'numInitialSyncAttempts': 1
}
},
true /* wait */);
// Wait for failpoint to be reached so we know that collection cloning is paused.
checkLog.contains(secondary, "initialSyncHangDuringCollectionClone fail point enabled");
jsTestLog("Running operations while collection cloning is paused");
// Commit a transaction on the sync source while collection cloning is paused so that we know
// they must be applied during the oplog application stage of initial sync.
assert.commandWorked(PrepareHelpers.commitTransaction(session1, prepareTimestamp1));
jsTestLog("Resuming initial sync");
// Resume initial sync.
assert.commandWorked(secondary.adminCommand(
{configureFailPoint: "initialSyncHangDuringCollectionClone", mode: "off"}));
// Wait for the secondary to complete initial sync.
replTest.waitForState(secondary, ReplSetTest.State.SECONDARY);
jsTestLog("Initial sync completed");
// Make sure the transaction committed properly and is reflected after the initial sync.
let res = secondary.getDB(dbName).getCollection(collName).findOne({_id: 2});
assert.docEq(res, {_id: 2}, res);
// Step up the secondary after initial sync is done and make sure we can successfully run
// another transaction.
replTest.stepUp(secondary);
replTest.waitForState(secondary, ReplSetTest.State.PRIMARY);
let newPrimary = replTest.getPrimary();
const session2 = newPrimary.startSession({causalConsistency: false});
const sessionDB2 = session2.getDatabase(dbName);
const sessionColl2 = sessionDB2.getCollection(collName);
session2.startTransaction();
assert.commandWorked(sessionColl2.insert({_id: 4}));
let prepareTimestamp2 = PrepareHelpers.prepareTransaction(session2);
assert.commandWorked(PrepareHelpers.commitTransaction(session2, prepareTimestamp2));
res = newPrimary.getDB(dbName).getCollection(collName).findOne({_id: 4});
assert.docEq(res, {_id: 4}, res);
replTest.stopSet();
})();
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