75 lines
2.7 KiB
JavaScript
75 lines
2.7 KiB
JavaScript
// Test the downgrade of a replica set from latest version
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// to last-stable version succeeds, while reads and writes continue.
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load('./jstests/multiVersion/libs/multi_rs.js');
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load('./jstests/libs/test_background_ops.js');
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var newVersion = "latest";
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var oldVersion = "last-stable";
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var name = "replsetdowngrade";
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var nodes = {
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n1: {binVersion: newVersion},
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n2: {binVersion: newVersion},
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n3: {binVersion: newVersion}
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};
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function runDowngradeTest(protocolVersion) {
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var rst = new ReplSetTest({name: name, nodes: nodes, waitForKeys: true});
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rst.startSet();
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var replSetConfig = rst.getReplSetConfig();
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replSetConfig.protocolVersion = protocolVersion;
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// Hard-code catchup timeout to be compatible with 3.4
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replSetConfig.settings = {catchUpTimeoutMillis: 2000};
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rst.initiate(replSetConfig);
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var primary = rst.getPrimary();
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var coll = "test.foo";
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// We wait for the feature compatibility version to be set to "3.4" on all nodes of the replica
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// set in order to ensure that all nodes can be successfully downgraded. This effectively allows
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// us to emulate upgrading to the latest version with existing data files and then trying to
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// downgrade back to 3.4.
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assert.commandWorked(primary.adminCommand({setFeatureCompatibilityVersion: "3.4"}));
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rst.awaitReplication();
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jsTest.log("Inserting documents into collection.");
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for (var i = 0; i < 10; i++) {
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primary.getCollection(coll).insert({_id: i, str: "hello world"});
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}
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function insertDocuments(rsURL, coll) {
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var coll = new Mongo(rsURL).getCollection(coll);
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var count = 10;
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while (!isFinished()) {
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assert.writeOK(coll.insert({_id: count, str: "hello world"}));
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count++;
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}
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}
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jsTest.log("Starting parallel operations during downgrade..");
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var joinFindInsert = startParallelOps(primary, insertDocuments, [rst.getURL(), coll]);
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jsTest.log("Downgrading replica set..");
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rst.upgradeSet({binVersion: oldVersion});
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jsTest.log("Downgrade complete.");
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// We save a reference to the old primary so that we can call reconnect() on it before
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// joinFindInsert() would attempt to send the node an update operation that signals the parallel
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// shell running the background operations to stop.
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var oldPrimary = primary;
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primary = rst.getPrimary();
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printjson(rst.status());
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// Since the old primary was restarted as part of the downgrade process, we explicitly reconnect
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// to it so that sending it an update operation silently fails with an unchecked NotMaster error
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// rather than a network error.
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reconnect(oldPrimary.getDB("admin"));
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joinFindInsert();
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rst.stopSet();
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}
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runDowngradeTest(0);
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runDowngradeTest(1);
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