56 lines
2.4 KiB
JavaScript
56 lines
2.4 KiB
JavaScript
// A mongos participating in a cluster that has been upgraded both a binary and FCV version above it
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// should crash.
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//
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// This kind of scenario can happen when a user forgets to upgrade the mongos binary and then calls
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// setFCV(upgrade), leaving the still downgraded mongos unable to communicate. Rather than the
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// mongos logging incompatible server version errors endlessly, we've chosen to crash it.
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TestData.skipCheckingUUIDsConsistentAcrossCluster = true;
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(function() {
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"use strict";
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load("jstests/libs/feature_compatibility_version.js");
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const lastStable = "last-stable";
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let st = new ShardingTest({mongos: 1, shards: 1});
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const ns = "testDB.testColl";
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let mongosAdminDB = st.s.getDB("admin");
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// Assert that a mongos using the 'last-stable' binary version will crash when connecting to a
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// cluster running on the 'latest' binary version with the 'latest' FCV.
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let lastStableMongos =
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MongoRunner.runMongos({configdb: st.configRS.getURL(), binVersion: lastStable});
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assert(!lastStableMongos);
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// Assert that a mongos using the 'last-stable' binary version will successfully connect to a
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// cluster running on the 'latest' binary version with the 'last-stable' FCV.
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assert.commandWorked(mongosAdminDB.runCommand({setFeatureCompatibilityVersion: lastStableFCV}));
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lastStableMongos =
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MongoRunner.runMongos({configdb: st.configRS.getURL(), binVersion: lastStable});
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assert.neq(null,
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lastStableMongos,
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"mongos was unable to start up with binary version=" + lastStable +
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" and connect to FCV=" + lastStableFCV + " cluster");
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// Ensure that the 'lastStable' binary mongos can perform reads and writes to the shards in the
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// cluster.
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assert.writeOK(lastStableMongos.getDB("test").foo.insert({x: 1}));
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let foundDoc = lastStableMongos.getDB("test").foo.findOne({x: 1});
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assert.neq(null, foundDoc);
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assert.eq(1, foundDoc.x, tojson(foundDoc));
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// Assert that the 'lastStable' binary mongos will crash after the cluster is upgraded to
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// 'latestFCV'.
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assert.commandWorked(mongosAdminDB.runCommand({setFeatureCompatibilityVersion: latestFCV}));
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let error = assert.throws(function() {
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lastStableMongos.getDB("test").foo.insert({x: 1});
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});
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assert(isNetworkError(error));
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assert(!lastStableMongos.conn);
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st.stop();
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})();
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