SERVER-46379 upgrade/downgrade support for initial sync semantics.

1 files changed, 68 insertions, 0 deletions

diff --git a/jstests/replsets/initial_sync_fcv_upgrade.js b/jstests/replsets/initial_sync_fcv_upgrade.js
new file mode 100644
index 00000000000..c251055da86
--- /dev/null
+++ b/jstests/replsets/initial_sync_fcv_upgrade.js
@@ -0,0 +1,68 @@
+/*
+ * Tests that on a successful fcv upgrade, adding new voters to the replica set
+ * makes replConfig to contain members with 'newlyAdded' field.
+ *
+ * This tests behavior centered around FCV upgrade.
+ * @tags: [multiversion_incompatible]
+ */
+(function() {
+'use strict';
+
+load('jstests/replsets/rslib.js');
+
+// Start a single node replica set.
+// Disable Chaining so that initial sync nodes always sync from primary.
+const rst = new ReplSetTest({
+    nodes: 1,
+    nodeOptions: {setParameter: {enableAutomaticReconfig: true}},
+    settings: {chainingAllowed: false}
+});
+rst.startSet();
+rst.initiateWithHighElectionTimeout();
+
+const dbName = jsTest.name();
+const collName = "coll";
+
+const primary = rst.getPrimary();
+const primaryDB = primary.getDB(dbName);
+const primaryColl = primaryDB[collName];
+const primaryAdminDB = primary.getDB("admin");
+
+// Set FCV to 4.4 to test the upgrade behavior.
+assert.commandWorked(primary.adminCommand({setFeatureCompatibilityVersion: lastStableFCV}));
+assert.commandWorked(primary.adminCommand({clearLog: "global"}));
+
+let startupParams = {};
+startupParams['failpoint.initialSyncHangAfterDataCloning'] = tojson({mode: 'alwaysOn'});
+startupParams['enableAutomaticReconfig'] = true;
+
+jsTestLog("Upgrade FCV to " + latestFCV);
+assert.commandWorked(primary.adminCommand({setFeatureCompatibilityVersion: latestFCV}));
+
+jsTestLog("Adding a new voting node (node1) to the replica set");
+const node1 = rst.add({rsConfig: {priority: 0, votes: 1}, setParameter: startupParams});
+rst.reInitiate();
+
+jsTestLog("Wait for node1 to hang during initial sync");
+checkLog.containsJson(node1, 21184);
+
+// Check that 'newlyAdded' field is  set.
+assert(isMemberNewlyAdded(primary, 1));
+assertVoteCount(primary, {
+    votingMembersCount: 1,
+    majorityVoteCount: 1,
+    writableVotingMembersCount: 1,
+    writeMajorityCount: 1,
+    totalMembersCount: 2,
+});
+
+jsTestLog("Perform test cleanup");
+assert.commandWorked(
+    node1.adminCommand({configureFailPoint: "initialSyncHangAfterDataCloning", mode: 'off'}));
+rst.waitForState(node1, ReplSetTest.State.SECONDARY);
+
+// Check if writeConcern: 2 works.
+assert.commandWorked(primaryColl.insert({_id: 0}, {"writeConcern": {"w": 2}}));
+
+rst.stopSet();
+}());
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