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// Tests that the last vote document is stored during elections and that it is loaded and used on
// startup.
//
// The test first runs a few elections and checks that the lastVote document is set correctly
// after each one.
//
// The test then restarts one node as a standalone, changes its last vote doc, and stops the
// other node. It then restarts the first node as a replicaset and manually runs
// replSetRequestVotes commands against it and checks that its response is correct.
//
// @tags: [requires_persistence]
(function() {
"use strict";
load("jstests/replsets/rslib.js"); // For getLatestOp()
var name = "last_vote";
var rst = new ReplSetTest({
name: name,
nodes: 2,
});
rst.startSet();
// Lower the election timeout to make the test run faster since it waits for multiple elections.
var conf = rst.getReplSetConfig();
conf.settings = {
electionTimeoutMillis: 3000,
};
rst.initiate(conf);
const lastVoteNS = 'local.replset.election';
function getLastVoteDoc(conn) {
assert.eq(
conn.getCollection(lastVoteNS).find().itcount(), 1, 'last vote should be singleton');
return conn.getCollection(lastVoteNS).findOne();
}
function setLastVoteDoc(conn, term, candidate) {
var newLastVote = {
term: term,
candidateIndex: rst.getNodeId(candidate)
};
return assert.writeOK(conn.getCollection(lastVoteNS).update({}, newLastVote));
}
function assertNodeHasLastVote(node, term, candidate) {
var lastVoteDoc = getLastVoteDoc(node);
assert.eq(lastVoteDoc.term, term, node.host + " had wrong last vote term.");
assert.eq(lastVoteDoc.candidateIndex,
rst.getNodeId(candidate),
node.host + " had wrong last vote candidate.");
}
function assertCurrentTerm(node, term) {
var stat = assert.commandWorked(node.adminCommand({replSetGetStatus: 1}));
assert.eq(stat.term, term, "Term changed when it should not have");
}
jsTestLog("Test that last vote is set on successive elections");
for (var i = 0; i < 3; i++) {
var primary = rst.getPrimary();
var term = getLatestOp(primary).t;
jsTestLog("Last vote should have term: " + term + " and candidate: " + primary.host +
", index: " + rst.getNodeId(primary));
rst.nodes.forEach(function(node) {
assertNodeHasLastVote(node, term, primary);
});
assert.throws(function() {
primary.adminCommand({replSetStepDown: 5, force: true});
});
rst.waitForState(primary, ReplSetTest.State.SECONDARY);
}
var term = getLatestOp(rst.getPrimary()).t + 100;
jsTestLog("Test that last vote is loaded on startup");
// We cannot reconfig nodes[0] to have priority 0 if it is currently the primary.
if (rst.getPrimary() === rst.nodes[0]) {
jsTestLog("Stepping down node 0 before reconfig");
assert.throws(function() {
rst.nodes[0].adminCommand({replSetStepDown: 5, force: true});
});
rst.waitForState(rst.nodes[0], ReplSetTest.State.SECONDARY);
}
jsTestLog("Reconfiguring cluster to make node 0 unelectable so it stays SECONDARY on restart");
conf = rst.getReplSetConfigFromNode();
conf.version++;
conf.members[0].priority = 0;
reconfig(rst, conf);
jsTestLog("Restarting node 0 as a standalone");
var node0 = rst.restart(0, {noReplSet: true}); // Restart as a standalone node.
jsTestLog("Stopping node 1");
rst.stop(1); // Stop node 1 so that node 0 controls the term by itself.
jsTestLog("Setting the lastVote on node 0 to term: " + term + " candidate: " +
rst.nodes[0].host + ", index: 0");
setLastVoteDoc(node0, term, rst.nodes[0]);
jsTestLog("Restarting node 0 in replica set mode");
node0 = rst.restart(0); // Restart in replSet mode again.
assertCurrentTerm(node0, term);
jsTestLog("Manually sending node 0 a dryRun replSetRequestVotes command, " +
"expecting failure in old term");
var response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: true,
term: term - 1,
candidateIndex: 1,
configVersion: 2,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(!response.voteGranted,
"node granted vote in term before last vote doc: " + tojson(response));
assert.eq(response.reason,
"candidate's term is lower than mine",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term, rst.nodes[0]);
assertCurrentTerm(node0, term);
jsTestLog("Manually sending node 0 a dryRun replSetRequestVotes command in same term, " +
"expecting success but no recording of lastVote");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: true,
term: term,
candidateIndex: 1,
configVersion: 2,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(response.voteGranted,
"node failed to grant dryRun vote in term equal to last vote doc: " + tojson(response));
assert.eq(response.reason,
"",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term, rst.nodes[0]);
assertCurrentTerm(node0, term);
jsTestLog(
"Manually sending node 0 a replSetRequestVotes command, expecting failure in same term");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: false,
term: term,
candidateIndex: 1,
configVersion: 2,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(!response.voteGranted,
"node granted vote in term of last vote doc: " + tojson(response));
assert.eq(response.reason,
"already voted for another candidate this term",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term, rst.nodes[0]);
assertCurrentTerm(node0, term);
jsTestLog("Manually sending node 0 a replSetRequestVotes command, " +
"expecting success with a recording of the new lastVote");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: false,
term: term + 1,
candidateIndex: 1,
configVersion: 2,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term + 1,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(response.voteGranted,
"node failed to grant vote in term greater than last vote doc: " + tojson(response));
assert.eq(response.reason,
"",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term + 1, rst.nodes[1]);
assertCurrentTerm(node0, term + 1);
jsTestLog("Manually sending node 0 a dryRun replSetRequestVotes command in future term, " +
"expecting success but no recording of lastVote");
response = assert.commandWorked(node0.adminCommand({
replSetRequestVotes: 1,
setName: name,
dryRun: true,
term: term + 2,
candidateIndex: 1,
configVersion: 2,
lastCommittedOp: getLatestOp(node0)
}));
assert.eq(response.term,
term + 2,
"replSetRequestVotes response had the wrong term: " + tojson(response));
assert(response.voteGranted,
"node failed to grant vote in term greater than last vote doc: " + tojson(response));
assert.eq(response.reason,
"",
"replSetRequestVotes response had the wrong reason: " + tojson(response));
assertNodeHasLastVote(node0, term + 1, rst.nodes[1]);
assertCurrentTerm(node0, term + 2);
rst.stopSet();
})();
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