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/**
* Test that rollback via refetch with no UUID support succeeds during downgrade. This runs various
* ddl commands that are expected to cause different UUID conflicts among the two nodes.
*/
(function() {
'use strict';
load('jstests/replsets/libs/rollback_test.js');
load("jstests/libs/check_log.js");
const testName = 'rollback_during_downgrade';
const dbName = testName;
// Set up Rollback Test.
let rollbackTest = new RollbackTest(testName);
let rollbackNode = rollbackTest.getPrimary();
let syncSourceNode = rollbackTest.getSecondary();
// Create some collections.
assert.writeOK(rollbackNode.getDB(dbName)['tToRemoveUUID'].insert({t: 1}));
assert.writeOK(rollbackNode.getDB(dbName)['tToDrop'].insert({t: 2}));
assert.writeOK(rollbackNode.getDB(dbName)['tToRename'].insert({t: 3}));
assert.writeOK(rollbackNode.getDB(dbName)['tToDropIndexes'].insert({t: 4}));
assert.commandWorked(rollbackNode.getDB(dbName)['tToDropIndexes'].createIndex({t: 1}));
assert.writeOK(rollbackNode.getDB(dbName)['tToNotRemoveUUID'].insert({t: 5}));
// Stop downgrade in the middle of the collMod section.
assert.commandWorked(rollbackNode.adminCommand({
configureFailPoint: 'hangBeforeDatabaseUpgrade',
data: {database: dbName},
mode: 'alwaysOn'
}));
// Downgrade the cluster in the background.
let downgradeFn = function() {
jsTestLog('Downgrading replica set');
let adminDB = db.getSiblingDB('admin');
try {
adminDB.runCommand({setFeatureCompatibilityVersion: '3.4'});
} catch (e) {
if (!isNetworkError(e)) {
throw e;
}
print("Downgrading set threw expected network error: " + tojson(e));
}
};
let waitForDowngradeToFinish = startParallelShell(downgradeFn, rollbackNode.port);
checkLog.contains(rollbackNode, 'collMod - hangBeforeDatabaseUpgrade fail point enabled');
// ----------------- Begins running operations only on the rollback node ------------------
rollbackTest.transitionToRollbackOperations();
// Allow the downgrade to complete the collMod section.
assert.commandWorked(
rollbackNode.adminCommand({configureFailPoint: 'hangBeforeDatabaseUpgrade', mode: 'off'}));
checkLog.contains(rollbackNode, 'Finished updating UUID schema version for downgrade');
// Tests that when we resync a two-phase dropped collection with a UUID on the sync source,
// the UUID is assigned correctly.
// Also tests that two-phase dropped collections are dropped eventually.
assert(rollbackNode.getDB(dbName)['tToDrop'].drop());
// Tests that when we resync a collection in a rename, the collection's UUID is
// assigned properly.
assert.commandWorked(rollbackNode.getDB(dbName)['tToRename'].renameCollection('tRenamed'));
// Tests that collections resynced due to dropIndexes commands are assigned UUIDs correctly.
assert.commandWorked(rollbackNode.getDB(dbName)['tToDropIndexes'].dropIndexes());
// ----------------- Begins running operations only on the sync source node ---------------
rollbackTest.transitionToSyncSourceOperationsBeforeRollback();
// Fake removing the UUID on the sync source, to test when neither node has a UUID for
// completeness.
assert.commandWorked(syncSourceNode.getDB(dbName).runCommand({
applyOps: [
{op: 'c', ns: dbName + '.$cmd', o: {collMod: 'tToRemoveUUID'}},
]
}));
// ----------------- Allows rollback to occur and checks for consistency ------------------
rollbackTest.transitionToSyncSourceOperationsDuringRollback();
rollbackTest.transitionToSteadyStateOperations();
waitForDowngradeToFinish();
rollbackTest.stop();
})();
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