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/**
* Tests upgrade/downgrade for valid eMRC=false usage.
*
* Verifies the following cases:
* 1. A user should be able to run a last-lts node with eMRC=F, shut down the node, and restart
* it with the latest binary and emrc=T.
* 2. A user should be able to run a latest node with eMRC=T, downgrade the FCV to last-lts, shut it
* down and restart it as a last-lts node with eMRC=F.
*
* TODO SERVER-53748: Remove this test once 5.0 becomes last-lts.
*/
(function() {
"use strict";
load('jstests/multiVersion/libs/verify_versions.js'); // For 'assert.binVersion()'
const dbName = "test";
const collName = jsTestName();
function doMajorityRead(emrc, priDB) {
if (emrc) {
assert.commandWorked(priDB.runCommand({find: collName, readConcern: {level: "majority"}}));
} else {
assert.commandFailedWithCode(
priDB.runCommand({find: collName, readConcern: {level: "majority"}}),
ErrorCodes.ReadConcernMajorityNotEnabled);
}
}
function runReplicaSetTest(upgrading) {
const startVersion = upgrading ? "last-lts" : "latest";
const endVersion = upgrading ? "latest" : "last-lts";
let emrc = upgrading ? false : true;
jsTestLog("Starting a replica set with " + startVersion + " binaries and eMRC=" + emrc);
const rst = new ReplSetTest(
{nodes: 2, nodeOptions: {binVersion: startVersion, enableMajorityReadConcern: emrc}});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const primaryDB = primary.getDB(dbName);
const adminDB = primary.getDB("admin");
const primaryColl = primaryDB[collName];
// Insert document using writeConcern majority.
assert.commandWorked(primaryColl.insert({a: 1}, {writeConcern: {w: "majority"}}));
// If eMRC=true, verify that we can do a majority read.
doMajorityRead(emrc, primaryDB);
// Set FCV to last-lts if downgrading from latest to last-lts.
if (!upgrading) {
const startFCV = binVersionToFCV(startVersion);
const endFCV = binVersionToFCV(endVersion);
checkFCV(adminDB, startFCV);
jsTestLog("Downgrading FCV to " + endFCV);
assert.commandWorked(adminDB.runCommand({setFeatureCompatibilityVersion: endFCV}));
checkFCV(adminDB, endFCV);
}
emrc = !emrc;
jsTestLog("Restarting replica set with " + endVersion + " binaries and eMRC=" + emrc);
rst.stopSet();
rst.startSet({binVersion: endVersion, enableMajorityReadConcern: emrc});
rst.initiate();
// Verify that all nodes are in the endVersion.
for (const node of rst.nodes) {
assert.binVersion(node, endVersion);
}
const newPrimary = rst.getPrimary();
const newPrimaryDB = newPrimary.getDB(dbName);
const newAdminDB = newPrimary.getDB("admin");
const newPrimaryColl = newPrimaryDB[collName];
// Always check that the restarted set is using last-lts FCV.
checkFCV(newAdminDB, binVersionToFCV("last-lts"));
// Insert document using writeConcern majority.
assert.commandWorked(newPrimaryColl.insert({b: 2}, {writeConcern: {w: "majority"}}));
// If eMRC=true, verify that we can do a majority read.
doMajorityRead(emrc, newPrimaryDB);
rst.stopSet();
}
// Test last-lts eMRC=false upgrade to latest eMRC=true.
runReplicaSetTest(true /* upgrading */);
// Test latest eMRC=true downgrade to last-lts eMRC=false.
runReplicaSetTest(false /* upgrading */);
})();
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