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// Test the downgrade of a replica set from latest version
// to last-stable version succeeds, while reads and writes continue.
load('./jstests/multiVersion/libs/multi_rs.js');
load('./jstests/libs/test_background_ops.js');
load('./jstests/libs/feature_compatibility_version.js');
let newVersion = "latest";
let oldVersion = "last-stable";
let name = "replsetdowngrade";
let nodes = {
n1: {binVersion: newVersion},
n2: {binVersion: newVersion},
n3: {binVersion: newVersion}
};
function runDowngradeTest(protocolVersion) {
let rst = new ReplSetTest({name: name, nodes: nodes, waitForKeys: true});
rst.startSet();
let replSetConfig = rst.getReplSetConfig();
replSetConfig.protocolVersion = protocolVersion;
rst.initiate(replSetConfig);
let primary = rst.getPrimary();
let coll = "test.foo";
// The default FCV is latestFCV for non-shard replica sets.
let primaryAdminDB = rst.getPrimary().getDB("admin");
checkFCV(primaryAdminDB, latestFCV);
// We wait for the feature compatibility version to be set to lastStableFCV on all nodes of the
// replica set in order to ensure that all nodes can be successfully downgraded. This
// effectively allows us to emulate upgrading to the latest version with existing data files and
// then trying to downgrade back to lastStableFCV.
assert.commandWorked(primary.adminCommand({setFeatureCompatibilityVersion: lastStableFCV}));
rst.awaitReplication();
jsTest.log("Inserting documents into collection.");
for (let i = 0; i < 10; i++) {
primary.getCollection(coll).insert({_id: i, str: "hello world"});
}
function insertDocuments(rsURL, collParam) {
let coll = new Mongo(rsURL).getCollection(collParam);
let count = 10;
while (!isFinished()) {
assert.writeOK(coll.insert({_id: count, str: "hello world"}));
count++;
}
}
jsTest.log("Starting parallel operations during downgrade..");
let joinFindInsert = startParallelOps(primary, insertDocuments, [rst.getURL(), coll]);
jsTest.log("Downgrading replica set..");
rst.upgradeSet({binVersion: oldVersion});
jsTest.log("Downgrade complete.");
// We save a reference to the old primary so that we can call reconnect() on it before
// joinFindInsert() would attempt to send the node an update operation that signals the parallel
// shell running the background operations to stop.
let oldPrimary = primary;
primary = rst.getPrimary();
printjson(rst.status());
// Since the old primary was restarted as part of the downgrade process, we explicitly reconnect
// to it so that sending it an update operation silently fails with an unchecked NotMaster error
// rather than a network error.
reconnect(oldPrimary.getDB("admin"));
joinFindInsert();
rst.stopSet();
}
runDowngradeTest(0);
runDowngradeTest(1);
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