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/**
* Tests that initial sync successfully reconstructs a prepared transaction using the oplog seed
* entry after failing the first attempt of initial sync and that we can commit the transactions
* afterwards. During the first attempt of initial sync, there will be some oplog entries that need
* to be applied and the lastApplied OpTime will be advanced along with the oplog application. We
* test that the lastApplied and the localSnapshot are properly reset after the first attempt fails.
* During the second attempt of initial sync, there will be no oplog entries that need to be applied
* and the prepare oplog entry will be inserted as the oplog seed. We then make sure the oplog seed
* entry is visible and the prepared transaction is properly reconstructed.
*
* @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 = "reconstruct_prepared_transactions_initial_sync_on_oplog_seed";
let testDB = primary.getDB(dbName);
let testColl = testDB.getCollection(collName);
const session = primary.startSession();
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB.getCollection(collName);
assert.commandWorked(testColl.insert({_id: 1}));
jsTestLog("Restarting the secondary");
// Restart the secondary with startClean set to true so that it goes through initial sync.
replTest.stop(secondary, undefined /* signal */, {skipValidation: true});
secondary = replTest.start(
secondary,
{
startClean: true,
setParameter: {
'numInitialSyncAttempts': 2,
// Fail point to force the first attempt to fail and hang before starting the second
// attempt.
'failpoint.failAndHangInitialSync': tojson({mode: 'alwaysOn'}),
'failpoint.initialSyncHangDuringCollectionClone': tojson(
{mode: 'alwaysOn', data: {namespace: testColl.getFullName(), numDocsToClone: 0}}),
'logComponentVerbosity': tojson({'replication': {'initialSync': 2}})
}
},
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");
// Perform writes while collection cloning is paused so that we know they must be applied during
// the first attempt of initial sync.
assert.commandWorked(testColl.insert({_id: 2}));
jsTestLog("Resuming initial sync");
// Resume initial sync.
assert.commandWorked(secondary.adminCommand(
{configureFailPoint: "initialSyncHangDuringCollectionClone", mode: "off"}));
// Wait for failpoint to be reached so we know that first attempt is finishing and is about to
// fail.
checkLog.contains(secondary, "failAndHangInitialSync fail point enabled");
jsTestLog("Preparing the transaction before the second attempt of initial sync");
session.startTransaction();
assert.commandWorked(sessionColl.update({_id: 1}, {_id: 1, a: 1}));
const prepareTimestamp = PrepareHelpers.prepareTransaction(session, {w: 1});
jsTestLog("Resuming initial sync for the second attempt");
// Resume initial sync.
assert.commandWorked(
secondary.adminCommand({configureFailPoint: "failAndHangInitialSync", mode: "off"}));
// Wait for the secondary to complete initial sync.
replTest.awaitSecondaryNodes();
PrepareHelpers.awaitMajorityCommitted(replTest, prepareTimestamp);
jsTestLog("Initial sync completed");
secondary.setSlaveOk();
const secondaryColl = secondary.getDB(dbName).getCollection(collName);
jsTestLog("Checking that the transaction is properly prepared");
// Make sure that we can't read changes to the document from the prepared transaction after
// initial sync.
assert.eq(secondaryColl.findOne({_id: 1}), {_id: 1});
jsTestLog("Committing the transaction");
assert.commandWorked(PrepareHelpers.commitTransaction(session, prepareTimestamp));
replTest.awaitReplication();
// Make sure that we can see the data from the committed transaction on the secondary if it was
// applied during secondary oplog application.
assert.eq(secondaryColl.findOne({_id: 1}), {_id: 1, a: 1});
replTest.stopSet();
})();
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