mongodb/jstests/replsets/stepup.js

// Tests the replSetStepUp command.

load("jstests/replsets/rslib.js");
load('jstests/replsets/libs/election_metrics.js');

(function() {
"use strict";
var name = "stepup";
var rst = new ReplSetTest({name: name, nodes: 2});

rst.startSet();
rst.initiate();
rst.awaitReplication();

var primary = rst.getPrimary();
var secondary = rst.getSecondary();

const initialSecondaryStatus = assert.commandWorked(secondary.adminCommand({serverStatus: 1}));

// Step up the primary. Return OK because it's already the primary.
var res = primary.adminCommand({replSetStepUp: 1});
assert.commandWorked(res);
assert.eq(primary, rst.getPrimary());

// Step up the secondary, but it's not eligible to be primary.
// Enable fail point on secondary.
assert.commandWorked(
    secondary.getDB('admin').runCommand({configureFailPoint: 'rsSyncApplyStop', mode: 'alwaysOn'}));

assert.commandWorked(primary.getDB("test").bar.insert({x: 2}, {writeConcern: {w: 1}}));
res = secondary.adminCommand({replSetStepUp: 1});
assert.commandFailedWithCode(res, ErrorCodes.CommandFailed);
assert.commandWorked(
    secondary.getDB('admin').runCommand({configureFailPoint: 'rsSyncApplyStop', mode: 'off'}));

// Wait for the secondary to catch up by replicating a doc to both nodes.
assert.commandWorked(primary.getDB("test").bar.insert({x: 3}, {writeConcern: {w: "majority"}}));

// Step up the secondary. Retry since the old primary may step down when we try to ask for its
// vote.
let numStepUpCmds = 0;
assert.soonNoExcept(function() {
    numStepUpCmds++;
    return secondary.adminCommand({replSetStepUp: 1}).ok;
});

// Make sure the step up succeeded.
assert.eq(secondary, rst.getPrimary());

const newSecondaryStatus = assert.commandWorked(secondary.adminCommand({serverStatus: 1}));

// Check that both the 'called' and 'successful' fields of stepUpCmd have been incremented in
// serverStatus, and that they have not been incremented in any of the other election reason
// counters.
verifyServerStatusElectionReasonCounterChange(initialSecondaryStatus.electionMetrics,
                                              newSecondaryStatus.electionMetrics,
                                              "stepUpCmd",
                                              numStepUpCmds);
verifyServerStatusElectionReasonCounterChange(initialSecondaryStatus.electionMetrics,
                                              newSecondaryStatus.electionMetrics,
                                              "priorityTakeover",
                                              0);
verifyServerStatusElectionReasonCounterChange(initialSecondaryStatus.electionMetrics,
                                              newSecondaryStatus.electionMetrics,
                                              "catchUpTakeover",
                                              0);
verifyServerStatusElectionReasonCounterChange(initialSecondaryStatus.electionMetrics,
                                              newSecondaryStatus.electionMetrics,
                                              "electionTimeout",
                                              0);
verifyServerStatusElectionReasonCounterChange(
    initialSecondaryStatus.electionMetrics, newSecondaryStatus.electionMetrics, "freezeTimeout", 0);

rst.stopSet();
})();