python buildscripts/resmoke.py --suites=no_server server31018.js repro_server31018.js ( function () { "use strict" ; load( "jstests/libs/parallelTester.js" ); // for ScopedThread and CountDownLatch const rst = new ReplSetTest({nodes: 2}); rst.startSet(); rst.initiate(); function setFCV(host, version, barrier) { const conn = new Mongo(host); barrier.countDown(); barrier.await(); try { assert.commandWorked(conn.adminCommand({setFeatureCompatibilityVersion: version})); return {ok: 1}; } catch (e) { return {ok: 0, error: e.toString(), stack: e.stack}; } } const primary = rst.getPrimary(); const secondary = rst.getSecondary(); const primaryDB = primary.getDB( "test" ); const secondaryDB = secondary.getDB( "test" ); while ( true ) { // We create two threads: one to set the server's featureCompatibilityVersion to "3.4" and // another to set the server's featureCompatibilityVersion to "3.6" . { const barrier = new CountDownLatch(2); const thread34 = new ScopedThread(setFCV, primary.host, "3.4" , barrier); const thread36 = new ScopedThread(setFCV, primary.host, "3.6" , barrier); thread34.start(); thread36.start(); thread34.join(); thread36.join(); assert.commandWorked(thread34.returnData()); assert.commandWorked(thread36.returnData()); } // If the thread that sets the server's featureCompatibilityVersion to "3.4" did its update // to the featureCompatibilityVersion document last, then we reset the server's // featureCompatibilityVersion to "3.6" and try again. { const res = assert.commandWorked( primaryDB.adminCommand({getParameter: 1, featureCompatibilityVersion: 1})); if (res.featureCompatibilityVersion === "3.4" ) { assert.commandWorked( primaryDB.adminCommand({setFeatureCompatibilityVersion: "3.6" })); continue ; } } // Otherwise, we implicitly create a collection via an insert operation and verify that the // collection has identical metadata on the primary and the secondary. { primaryDB.mycoll.drop(); assert.writeOK(primaryDB.mycoll.insert({}, {writeConcern: {w: 2}})); const primaryCollectionInfos = primaryDB.getCollectionInfos({name: "mycoll" }); assert.eq(1, primaryCollectionInfos.length, tojson(primaryCollectionInfos)); const secondaryCollectionInfos = secondaryDB.getCollectionInfos({name: "mycoll" }); assert.eq(1, secondaryCollectionInfos.length, tojson(secondaryCollectionInfos)); assert.eq(primaryCollectionInfos[0], secondaryCollectionInfos[0], "Expected primary and secondary to have the same collection metadata" ); } } rst.stopSet(); })();