67 lines
2.9 KiB
JavaScript
67 lines
2.9 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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import {ShardingTest} from "jstests/libs/shardingtest.js";
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TestData.skipCheckingUUIDsConsistentAcrossCluster = true;
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function runTest(downgradeVersion) {
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jsTestLog("Running test with downgradeVersion: " + downgradeVersion);
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const downgradeFCV = binVersionToFCV(downgradeVersion);
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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 downgraded 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 downgradedMongos = MongoRunner.runMongos({configdb: st.configRS.getURL(), binVersion: downgradeVersion});
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assert(!downgradedMongos);
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// Assert that a mongos using the downgraded binary version will successfully connect to a
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// cluster running on the 'latest' binary version with the downgraded FCV.
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assert.commandWorked(mongosAdminDB.runCommand({setFeatureCompatibilityVersion: downgradeFCV, confirm: true}));
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// wait until all config server nodes are downgraded
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// awaitReplication waits for all secondaries to replicate primary's latest opTime which will
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// guarantee propagation of the write to the admin.system.version collection which triggers the
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// change FCV.
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st.configRS.awaitReplication();
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downgradedMongos = MongoRunner.runMongos({configdb: st.configRS.getURL(), binVersion: downgradeVersion});
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assert.neq(
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null,
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downgradedMongos,
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"mongos was unable to start up with binary version=" +
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downgradeVersion +
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" and connect to FCV=" +
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downgradeFCV +
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" cluster",
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);
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// Ensure that the 'downgradeVersion' binary mongos can perform reads and writes to the shards
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// in the cluster.
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assert.commandWorked(downgradedMongos.getDB("test").foo.insert({x: 1}));
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let foundDoc = downgradedMongos.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 'downgradeVersion' 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, confirm: true}));
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let error = assert.throws(function () {
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downgradedMongos.getDB("test").foo.insert({x: 1});
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});
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assert(isNetworkError(error));
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assert(!downgradedMongos.conn);
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st.stop();
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}
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runTest("last-continuous");
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runTest("last-lts");
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