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/**
* This test simulates initial sync workflows which are performed by the Atlas automation agent.
*/
(function() {
"use strict";
load('jstests/replsets/rslib.js'); // waitForState.
const testName = TestData.testName;
// 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.
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 testAddWithInitialSync(secondariesDown) {
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}});
// 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({addWithInitialSync: 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();
}
function testReplaceWithInitialSync(secondariesDown) {
const nodeToBeReplaced = rst.getSecondaries()[2];
secondariesDown = secondariesDown || 0;
const useForce = secondariesDown > 1;
let config = rst.getReplSetConfigFromNode(primary.nodeId);
disconnectSecondaries(secondariesDown);
if (useForce) {
// Wait for the set to become unhealthy.
rst.waitForState(primary, ReplSetTest.State.SECONDARY);
}
let nodeId = rst.getNodeId(nodeToBeReplaced);
const nodeVotes = config.members[nodeId].votes;
const highestMemberId = config.members[nodeId]._id;
if (nodeVotes > 0) {
jsTestLog("Reconfiguring to remove the node.");
config.version += 1;
config.members.splice(nodeId, 1);
assert.commandWorked(primary.adminCommand(
{replSetReconfig: config, maxTimeMS: ReplSetTest.kDefaultTimeoutMS, force: useForce}));
}
jsTestLog("Stopping node for replacement");
rst.stop(nodeToBeReplaced, undefined, {skipValidation: true}, {forRestart: true});
rst.remove(nodeToBeReplaced);
if (!useForce) {
// Add some data. This can't work in a majority-down situation, so we don't do it then.
assert.commandWorked(testDb[testName].insert({replaceWithInitialSync: secondariesDown},
{writeConcern: {w: 1}}));
}
jsTestLog("Starting a new replacement node with empty data directory.");
const replacementNode = rst.add({rsConfig: {votes: 0, priority: 0}});
// The second disconnect ensures we can't reach the replacement node from the 'down' nodes.
disconnectSecondaries(secondariesDown);
nodeId = rst.getNodeId(replacementNode);
config = rst.getReplSetConfigFromNode(primary.nodeId);
const newConfig = rst.getReplSetConfig();
config.members = newConfig.members;
// Don't recycle the member id.
config.members[nodeId]._id = highestMemberId + 1;
config.version += 1;
jsTestLog("Reconfiguring set to add the replacement node.");
assert.commandWorked(primary.adminCommand(
{replSetReconfig: config, maxTimeMS: ReplSetTest.kDefaultTimeoutMS, force: useForce}));
jsTestLog("Waiting for the replacement node to sync.");
rst.waitForState(replacementNode, ReplSetTest.State.SECONDARY);
if (nodeVotes > 0) {
jsTestLog("Reconfiguring the replacement node to have votes.");
config = rst.getReplSetConfigFromNode(primary.nodeId);
config.version += 1;
config.members[nodeId].votes = nodeVotes;
assert.commandWorked(primary.adminCommand(
{replSetReconfig: config, maxTimeMS: ReplSetTest.kDefaultTimeoutMS, force: useForce}));
}
if (!useForce) {
// Make sure we can replicate to it, if the set is otherwise healthy.
rst.awaitReplication(undefined, undefined, [replacementNode]);
}
// 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 initial sync in a healthy system.");
testAddWithInitialSync(0);
jsTestLog("Test adding a node with initial sync with one secondary unreachable.");
testAddWithInitialSync(1);
jsTestLog("Test adding a node with initial sync with two secondaries unreachable.");
testAddWithInitialSync(2);
jsTestLog("Adding node for replace-node scenarios");
const newNode = rst.add({rsConfig: {priority: 0}});
rst.reInitiate();
// Wait for the node to to become secondary.
waitForState(newNode, ReplSetTest.State.SECONDARY);
jsTestLog("Test replacing a node with initial sync in a healthy system.");
testReplaceWithInitialSync(0);
jsTestLog("Test replacing a node with initial sync with one secondary unreachable.");
testReplaceWithInitialSync(1);
jsTestLog("Test replacing a node with initial sync with two secondaries unreachable.");
testReplaceWithInitialSync(2);
rst.stopSet();
})();
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