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/**
* This test verifies that if mongod exits after setting the FCV document to 3.4 before the
* collection UUIDs are removed, that re-running the downgrade to 3.4 is possible.
*/
(function() {
"use strict";
load("jstests/libs/feature_compatibility_version.js");
let setFCV = function(adminDB, version) {
assert.commandWorked(adminDB.runCommand({setFeatureCompatibilityVersion: version}));
};
// Inserts test data
let insertDataForConn = function(conn, dbs) {
for (let i = 0; i < 20; i++) {
let doc = {id: i, a: "foo", conn: conn.name};
for (let j in dbs) {
assert.writeOK(conn.getDB(dbs[j]).foo.insert(doc));
}
}
};
// Verifies that UUIDs exist when uuidsExpected is true, and that UUIDs do not exist when
// uuidsExpected is false.
let checkCollectionUUIDs = function(adminDB, uuidsExpected, excludeLocal = true) {
let databaseList = adminDB.runCommand({"listDatabases": 1}).databases;
databaseList.forEach(function(database) {
if (excludeLocal && database.name == "local") {
return;
}
let currentDatabase = adminDB.getSiblingDB(database.name);
let collectionInfos = currentDatabase.getCollectionInfos();
for (let i = 0; i < collectionInfos.length; i++) {
// Always skip system.indexes due to SERVER-30500.
if (collectionInfos[i].name == "system.indexes") {
continue;
}
// Exclude checking all collections in local until SERVER-30131 is fixed.
if (!uuidsExpected) {
assert(!collectionInfos[i].info.uuid,
"Unexpected uuid for collection: " + tojson(collectionInfos[i]));
} else {
assert(collectionInfos[i].info.uuid,
"Expect uuid for collection: " + tojson(collectionInfos[i]));
}
}
});
};
jsTest.log("Testing Incomplete Downgrade");
let dbpath = MongoRunner.dataPath + "incomplete_downgrade";
resetDbpath(dbpath);
let conn = MongoRunner.runMongod({dbpath: dbpath});
assert.neq(null, conn, "mongod was unable to start up");
let adminDB = conn.getDB("admin");
// Insert test data.
insertDataForConn(conn, ["admin", "local", "test"]);
// Ensure featureCompatibilityVersion is 3.6 and collections have UUIDs.
checkFCV(adminDB, "3.6");
checkCollectionUUIDs(adminDB, true);
// Set failure point to exit after setting featureCompatibilityVersion document before removing
// UUIDs from collections.
assert.commandWorked(
conn.adminCommand({configureFailPoint: "featureCompatibilityDowngrade", mode: "alwaysOn"}));
// Downgrade, which should trigger a shutdown, so don't check for result.
// Mongod should stop responding.
assert.soon(function() {
try {
adminDB.runCommand({setFeatureCompatibilityVersion: "3.4"});
} catch (e) {
return true;
}
}, "Mongod should stop responding", 10 * 1000);
// Check for clean exit.
MongoRunner.validateCollectionsCallback = function() {};
MongoRunner.stopMongod(conn);
clearRawMongoProgramOutput();
// Start mongod again with the same dbpath
conn = MongoRunner.runMongod({dbpath: dbpath, noCleanData: true});
assert.neq(null, conn, "mongod was unable to start up");
adminDB = conn.getDB("admin");
// FeatureCompatibility version should be 3.4 and targetVersion should be 3.4.
checkFCV(adminDB, "3.4", "3.4");
// Verify startup warnings
let msgUpgrade = "WARNING: A featureCompatibilityVersion upgrade did not complete";
let msgDowngrade = "WARNING: A featureCompatibilityVersion downgrade did not complete";
let msg2 = "use the setFeatureCompatibilityVersion command to resume";
assert.soon(function() {
return rawMongoProgramOutput().match(msgDowngrade) && rawMongoProgramOutput().match(msg2);
}, "Mongod should have printed startup warning about collections having UUIDs in FCV 3.4");
// Check that collections still have UUIDs.
checkCollectionUUIDs(adminDB, /* uuidsExpected */ true);
// Now that failpoint is not set, resume downgrade.
setFCV(adminDB, "3.4");
// Verify no collections have UUIDS now.
checkCollectionUUIDs(adminDB, false);
jsTest.log("Testing Incomplete Upgrade");
// Set failure point to exit before setting featureCompatibilityVersion document and after
// creating UUIDs for collections.
assert.commandWorked(
conn.adminCommand({configureFailPoint: "featureCompatibilityUpgrade", mode: "alwaysOn"}));
// Try upgrade to 3.6, which triggers the failpoint to exit, immediately after creating UUIDs.
assert.soon(function() {
try {
adminDB.runCommand({setFeatureCompatibilityVersion: "3.6"});
} catch (e) {
return true;
}
}, "Mongod should stop responding", 10 * 1000);
// Verify mongod stopped cleanly
MongoRunner.stopMongod(conn);
clearRawMongoProgramOutput();
// Start mongod again with the same dbpath
conn = MongoRunner.runMongod({dbpath: dbpath, noCleanData: true});
assert.neq(null, conn, "mongod was unable to start up");
adminDB = conn.getDB("admin");
// Verify startup warnings
assert.soon(function() {
return rawMongoProgramOutput().match(msgUpgrade) && rawMongoProgramOutput().match(msg2);
}, "Mongod should have printed startup warning about collections having UUIDs in FCV 3.4");
// Check that collections have UUIDs.
checkCollectionUUIDs(adminDB, /* uuidsExpected */ true);
// The FCV document should not be updated yet, but the targetVersion should be 3.6
checkFCV(adminDB, "3.4", "3.6");
// Now that failpoint is not set, resume upgrade.
setFCV(adminDB, "3.6");
// Verify all collections still have UUIDS.
checkCollectionUUIDs(adminDB, true);
// Verify FCV.
checkFCV(adminDB, "3.6");
})();
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