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/**
* Test that the 'reconfig' helper function correctly executes arbitrary reconfigs.
*
* @tags: [
* requires_replication,
* ]
*/
(function() {
"use strict";
load("jstests/replsets/rslib.js");
// Make secondaries unelectable.
const replTest =
new ReplSetTest({nodes: [{}, {rsConfig: {priority: 0}}, {rsConfig: {priority: 0}}]});
replTest.startSet();
let conf = replTest.getReplSetConfig();
conf.settings = {
// Speed up config propagation.
heartbeatIntervalMillis: 100,
};
replTest.initiate(conf);
// Start out with config {n0,n1,n2}
let config = replTest.getReplSetConfigFromNode();
let origConfig = Object.assign({}, config);
let [m0, m1, m2] = origConfig.members;
//
// Test reconfigs that only change config settings but not the member set.
//
jsTestLog("Testing reconfigs that don't modify the member set.");
// Change the 'electionTimeoutMillis' setting.
config.settings.electionTimeoutMillis = config.settings.electionTimeoutMillis + 1;
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Do a reconfig that leaves out a config setting that will take on a default.
delete config.settings.electionTimeoutMillis;
reconfig(replTest, config);
// The installed config should be the same as the given config except for the default value.
let actualConfig = replTest.getReplSetConfigFromNode();
assert(actualConfig.settings.hasOwnProperty("electionTimeoutMillis"));
config.settings.electionTimeoutMillis = actualConfig.settings.electionTimeoutMillis;
assertSameConfigContent(actualConfig, config);
// Change a member config parameter.
config.members[0].priority = 2;
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
//
// Test member set changes.
//
jsTestLog("Testing member set changes.");
// Start in the original config and reset the config object.
reconfig(replTest, origConfig);
config = replTest.getReplSetConfigFromNode();
// Remove 2 nodes, {n1, n2}.
config.members = [m0];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Add 2 nodes, {n1, n2}.
config.members = [m0, m1, m2];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Remove one node so we can test swapping a node out.
config.members = [m0, m2];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Remove n2 and add n1 simultaneously (swap a node).
config.members = [m0, m1];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Remove both existing nodes (n0, n1) and add a new node (n2). Removing a node that is executing
// the reconfig shouldn't be allowed, but we test it here to make sure it fails in an expected way.
m2.priority = 1;
config.members = [m2];
try {
reconfig(replTest, config);
} catch (e) {
assert.eq(e.code, ErrorCodes.NewReplicaSetConfigurationIncompatible, tojson(e));
}
// Reset the member's priority.
m2.priority = 0;
//
// Test voting set changes that don't change the member set.
//
jsTestLog("Testing voting set changes.");
// Start in the original config.
reconfig(replTest, origConfig);
// Remove two nodes, {n1,n2}, from the voting set.
m1.votes = 0;
m2.votes = 0;
config.members = [m0, m1, m2];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Add two nodes, {n1,n2}, to the voting set.
m1.votes = 1;
m2.votes = 1;
config.members = [m0, m1, m2];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Remove one node n1 from the voting set.
m1.votes = 0;
m2.votes = 1;
config.members = [m0, m1, m2];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Add one node (n1) and remove one node (n2) from the voting set.
m1.votes = 1;
m2.votes = 0;
config.members = [m0, m1, m2];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Make n2 voting by omitting a 'votes' field, which is allowed.
delete m2.votes;
config.members = [m0, m1, m2];
reconfig(replTest, config);
actualConfig = replTest.getReplSetConfigFromNode();
assert.eq(actualConfig.members[2].votes, 1);
config.members[2].votes = 1;
assertSameConfigContent(actualConfig, config);
// Remove the primary (n0) from the voting set and remove n2. We expect this to fail.
m0.votes = 0;
m0.priority = 0;
m1.priority = 1;
m1.votes = 1;
m2.priority = 0;
m2.votes = 0;
config.members = [m0, m1, m2];
try {
reconfig(replTest, config);
} catch (e) {
assert.eq(e.code, ErrorCodes.NewReplicaSetConfigurationIncompatible, tojson(e));
}
//
// Test simultaneous voting set and member set changes.
//
jsTestLog("Testing simultaneous voting set and member set changes.");
// Start in the original config and reset vote counts.
m0.votes = 1;
m0.priority = 1;
m1.votes = 1;
m1.priority = 0;
m2.votes = 1;
m2.priority = 0;
reconfig(replTest, origConfig);
// Remove voting node n2 and make n1 non voting.
m1.votes = 0;
m2.votes = 1;
config.members = [m0, m1];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Add voting node n2 and make n1 voting.
m1.votes = 1;
m2.votes = 1;
config.members = [m0, m1, m2];
reconfig(replTest, config);
assertSameConfigContent(replTest.getReplSetConfigFromNode(), config);
// Restore the original config before shutting down.
reconfig(replTest, origConfig);
// There is a chance that some nodes haven't finished reconfig, if we directly call stopSet, those
// nodes may fail to answer certain commands and fail the test.
waitAllNodesHaveConfig(replTest, config);
replTest.stopSet();
})();
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