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/**
* This test simulates workflows which are performed by the Atlas automation agent, where nodes are
* created or restarted using file system snapshots.
*
* @tags: [requires_persistence]
*/
// Set up a standard 3-node replica set. Note the two secondaries are priority 0; this is
// different than the real Atlas configuration where the secondaries would be electable.
(function() {
"use strict";
// Snapshot works only on enterprise.
if (!buildInfo()["modules"].includes("enterprise")) {
printjson(buildInfo()["modules"]);
jsTestLog("Skipping snapshot tests because not running on enterprise.");
return 0;
}
load("jstests/libs/backup_utils.js");
const testName = TestData.testName;
const rst = new ReplSetTest({
name: testName,
nodes: [{}, {rsConfig: {priority: 0}}, {rsConfig: {priority: 0}}],
useBridge: true,
// We shorten the election timeout period so the tests with an unhealthy set run and recover
// faster.
settings: {electionTimeoutMillis: 2000, heartbeatIntervalMillis: 400}
});
rst.startSet();
rst.initiate();
// Add some data.
const primary = rst.getPrimary();
const testDb = primary.getDB("test");
assert.commandWorked(testDb[testName].insert([{a: 1}, {b: 2}, {c: 3}]));
rst.awaitReplication();
function disconnectSecondaries(secondariesDown) {
for (let i = 1; i <= secondariesDown; i++) {
for (const node of rst.nodes) {
if (node !== rst.nodes[i]) {
node.disconnect(rst.nodes[i]);
}
}
}
}
function reconnectSecondaries() {
for (const node of rst.nodes) {
for (const node2 of rst.nodes) {
if (node2 !== node) {
node2.reconnect(node);
}
}
}
}
function testAddWithSnapshot(secondariesDown) {
const newdbpath = MongoRunner.dataPath + "newNode";
jsTestLog("Making snapshot of primary");
backupData(primary, newdbpath);
// Add some data after the backup.
assert.commandWorked(testDb[testName].insert({addWithSnapshotAfterSnapshot: secondariesDown},
{writeConcern: {w: 1}}));
let config = rst.getReplSetConfigFromNode();
secondariesDown = secondariesDown || 0;
disconnectSecondaries(secondariesDown);
const useForce = secondariesDown > 1;
if (useForce) {
// Wait for the set to become unhealthy.
rst.waitForState(primary, ReplSetTest.State.SECONDARY);
}
// Atlas always adds nodes with 0 votes and priority
const newNode =
rst.add({rsConfig: {votes: 0, priority: 0}, noCleanData: true, dbpath: newdbpath});
// The second disconnect ensures we can't reach the new node from the 'down' nodes.
disconnectSecondaries(secondariesDown);
const newConfig = rst.getReplSetConfig();
config.members = newConfig.members;
config.version += 1;
jsTestLog("Reconfiguring set to add node.");
assert.commandWorked(primary.adminCommand(
{replSetReconfig: config, maxTimeMS: ReplSetTest.kDefaultTimeoutMS, force: useForce}));
jsTestLog("Waiting for node to sync.");
rst.waitForState(newNode, ReplSetTest.State.SECONDARY);
jsTestLog("Reconfiguring added node to have votes");
config = rst.getReplSetConfigFromNode(primary.nodeId);
config.version += 1;
config.members[3].votes = 1;
assert.commandWorked(primary.adminCommand(
{replSetReconfig: config, maxTimeMS: ReplSetTest.kDefaultTimeoutMS, force: useForce}));
if (!useForce) {
// Make sure we can replicate to it. This only works if the set was healthy, otherwise we
// can't.
assert.commandWorked(
testDb[testName].insert({addWithSnapshot: secondariesDown}, {writeConcern: {w: 1}}));
rst.awaitReplication(undefined, undefined, [newNode]);
}
// Make sure the set is still consistent after adding the node.
reconnectSecondaries();
// If we were in a majority-down scenario, wait for the primary to be re-elected.
assert.soon(() => primary == rst.getPrimary());
rst.checkOplogs();
rst.checkReplicatedDataHashes();
// Remove our extra node.
rst.stop(newNode);
rst.remove(newNode);
rst.reInitiate();
resetDbpath(newdbpath);
}
function testReplaceWithSnapshot(node, secondariesDown) {
secondariesDown = secondariesDown || 0;
const useForce = secondariesDown > 1;
const replacedbpath = rst.getDbPath(node);
const backupdbpath = replacedbpath + "_bak";
let config = rst.getReplSetConfigFromNode();
jsTestLog("Backing up the primary node");
backupData(primary, backupdbpath);
// Add some data after the backup.
assert.commandWorked(
testDb[testName].insert({replaceWithSnapshot: secondariesDown}, {writeConcern: {w: 1}}));
disconnectSecondaries(secondariesDown);
if (useForce) {
// Wait for the set to become unhealthy.
rst.waitForState(primary, ReplSetTest.State.SECONDARY);
}
jsTestLog("Stopping node for replacement of data");
rst.stop(node, undefined, undefined, {forRestart: true});
jsTestLog("Replacing node data with snapshot");
copyDbpath(backupdbpath, replacedbpath);
resetDbpath(backupdbpath);
jsTestLog("Restarting replacement node.");
rst.start(node, undefined, true /* restart */);
// We can't use awaitSecondaryNodes because the set might not be healthy.
assert.soonNoExcept(() => node.adminCommand({isMaster: 1}).secondary);
if (!useForce) {
// Make sure we can replicate to it, if the set is otherwise healthy.
rst.awaitReplication(undefined, undefined, [node]);
}
// Make sure the set is still consistent after resyncing the node.
reconnectSecondaries();
// If we were in a majority-down scenario, wait for the primary to be re-elected.
assert.soon(() => primary == rst.getPrimary());
rst.checkOplogs();
rst.checkReplicatedDataHashes();
}
jsTestLog("Test adding a node with snapshot in a healthy system.");
testAddWithSnapshot(0);
jsTestLog("Test adding a node with snapshot with one secondary unreachable.");
testAddWithSnapshot(1);
jsTestLog("Test adding a node with snapshot with two secondaries unreachable.");
testAddWithSnapshot(2);
jsTestLog("Adding node for replace-node scenarios");
let newNode = rst.add({rsConfig: {priority: 0}});
rst.reInitiate();
jsTestLog("Test replacing a node with snapshot in a healthy system.");
testReplaceWithSnapshot(newNode, 0);
jsTestLog("Test replacing a node with snapshot with one secondary unreachable.");
testReplaceWithSnapshot(newNode, 1);
jsTestLog("Test replacing a node with snapshot with two secondaries unreachable.");
testReplaceWithSnapshot(newNode, 2);
rst.stopSet();
})();
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