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/**
* Tests that setting the feature compatibility version during initial sync leads to initial sync
* restarting. This test also ensures that even if initial sync takes two attempts to complete,
* that the fCV is reset between attempts.
*
* This tests behavior centered around both upgrading and downgrading FCV.
* @tags: [multiversion_incompatible]
*/
(function() {
'use strict';
load("jstests/libs/fail_point_util.js");
const rst = new ReplSetTest({nodes: 2});
rst.startSet();
// We disallow the secondary node from voting so that the primary's featureCompatibilityVersion
// can be modified while the secondary node is still waiting to complete its initial sync.
const replSetConfig = rst.getReplSetConfig();
replSetConfig.members[1].priority = 0;
replSetConfig.members[1].votes = 0;
rst.initiate(replSetConfig);
const primary = rst.getPrimary();
const dbName = 'foo';
const collName = 'bar';
// The default WC is majority and this test can't satisfy majority writes.
assert.commandWorked(primary.adminCommand(
{setDefaultRWConcern: 1, defaultWriteConcern: {w: 1}, writeConcern: {w: "majority"}}));
assert.commandWorked(primary.getDB(dbName).getCollection(collName).insert({a: 1}));
function runInitialSync(cmd, initialFCV) {
assert.commandWorked(primary.adminCommand({setFeatureCompatibilityVersion: initialFCV}));
jsTestLog('Testing setting fCV with ' + tojson(cmd));
const failPointOptions = tojson({
mode: 'alwaysOn',
data: {cloner: "DatabaseCloner", stage: "listCollections", database: dbName}
});
rst.restart(1, {
startClean: true,
setParameter: {
'failpoint.hangBeforeClonerStage': failPointOptions,
'failpoint.skipClearInitialSyncState': tojson({mode: 'alwaysOn'}),
numInitialSyncAttempts: 2
}
});
const secondary = rst.nodes[1];
// Initial sync clones the 'admin' database first, which will set the fCV on the
// secondary to initialFCV. We then block the secondary before issuing 'listCollections' on
// the test database.
assert.commandWorked(secondary.adminCommand({
waitForFailPoint: "hangBeforeClonerStage",
timesEntered: 1,
maxTimeMS: kDefaultWaitForFailPointTimeout
}));
// Initial sync is stopped right before 'listCollections' on the test database. We now run
// the test command to modify the fCV.
assert.commandWorked(primary.adminCommand(cmd));
// Let initial sync finish, making sure that it fails due to the feature compatibility
// version change.
assert.commandWorked(
secondary.adminCommand({configureFailPoint: 'hangBeforeClonerStage', mode: 'off'}));
checkLog.contains(secondary, 'Applying operation on feature compatibility version document');
jsTestLog('Wait for both nodes to be up-to-date');
rst.awaitSecondaryNodes();
rst.awaitReplication();
let res = assert.commandWorked(secondary.adminCommand({replSetGetStatus: 1}));
assert.eq(res.initialSyncStatus.failedInitialSyncAttempts, 1);
// We check oplogs and data hashes before we restart the second node.
rst.checkOplogs();
rst.checkReplicatedDataHashes();
}
// Ensure that attempting to downgrade the featureCompatibilityVersion during initial sync
// fails.
runInitialSync({setFeatureCompatibilityVersion: lastLTSFCV}, /*initialFCV*/ latestFCV);
// Ensure that attempting to upgrade the featureCompatibilityVersion during initial sync fails.
runInitialSync({setFeatureCompatibilityVersion: latestFCV}, /*initialFCV*/ lastLTSFCV);
// Modifications to the featureCompatibilityVersion document during initial sync should be
// caught and cause initial sync to fail.
runInitialSync({
update: 'system.version',
updates: [{q: {_id: 'featureCompatibilityVersion'}, u: {'version': lastLTSFCV}}]
},
/*initialFCV*/ latestFCV);
rst.stopSet();
})();
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