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// Ensure writes do not prevent a node from Stepping down
// 1. Start up a 3 node set (1 arbiter).
// 2. Stop replication on the SECONDARY using a fail point.
// 3. Do one write and then spin up a second shell which asks the PRIMARY to StepDown.
// 4. Once StepDown has begun, spin up a third shell which will attempt to do writes, which should
// block waiting for StepDown to release its lock.
// 5. Once a write is blocked, restart replication on the SECONDARY.
// 6. Wait for PRIMARY to StepDown.
(function () {
"use strict";
var name = "stepDownWithLongWait";
var replSet = new ReplSetTest({name: name, nodes: 3});
var nodes = replSet.nodeList();
replSet.startSet();
replSet.initiate({"_id" : name,
"members" : [
{"_id" : 0, "host" : nodes[0], "priority" : 3},
{"_id" : 1, "host" : nodes[1]},
{"_id" : 2, "host" : nodes[2], "arbiterOnly" : true}]});
replSet.waitForState(replSet.nodes[0], replSet.PRIMARY, 60 * 1000);
var primary = replSet.getPrimary();
var secondary = replSet.getSecondary();
jsTestLog('Disable replication on the SECONDARY ' + secondary.host);
assert.commandWorked(
secondary.getDB('admin').runCommand(
{configureFailPoint: 'rsSyncApplyStop', mode: 'alwaysOn'}
),
'Failed to configure rsSyncApplyStop failpoint.'
);
jsTestLog("do a write then ask the PRIMARY to stepdown");
var options = {writeConcern: {w: 1, wtimeout: 60000}};
assert.writeOK(primary.getDB(name).foo.insert({x: 1}, options));
var stepDownSecs = 60;
var secondaryCatchUpPeriodSecs = 60;
var stepDownCmd = "db.getSiblingDB('admin').runCommand({" +
"replSetStepDown: " + stepDownSecs + ", " +
"secondaryCatchUpPeriodSecs: " + secondaryCatchUpPeriodSecs +
"});";
var stepDowner = startParallelShell(stepDownCmd, primary.port);
assert.soon(function() {
var res = primary.getDB('admin').currentOp(true);
for (var entry in res.inprog) {
if (res.inprog[entry]["query"] && res.inprog[entry]["query"]["replSetStepDown"] === 60){
return true;
}
}
printjson(res);
return false;
}, "global shared lock not acquired", 30000, 1000);
jsTestLog("do a write and wait for it to be waiting for a lock");
var updateCmd = function() {
jsTestLog('Updating document on the primary. Blocks until the primary has stepped down.')
try {
var res = db.getSiblingDB("stepDownWithLongWait").foo.update({}, {$inc: {x: 1}});
jsTestLog('Unexpected successful update operation on the primary during step down: ' +
tojson(res));
}
catch (e) {
// Not important what error we get back. The client will probably be disconnected by
// the primary with a "error doing query: failed" message.
jsTestLog('Update operation returned with result: ' + tojson(e));
}
};
var writer = startParallelShell(updateCmd, primary.port);
assert.soon(function() {
var res = primary.getDB(name).currentOp();
for (var entry in res.inprog) {
if (res.inprog[entry]["waitingForLock"]) {
return true;
}
}
printjson(res);
return false;
}, "write failed to block on global lock", 30000, 1000);
jsTestLog('Enable replication on the SECONDARY ' + secondary.host);
assert.commandWorked(
secondary.getDB('admin').runCommand(
{configureFailPoint: 'rsSyncApplyStop', mode: 'off'}
),
'Failed to disable rsSyncApplyStop failpoint.'
);
jsTestLog("Wait for PRIMARY " + primary.host + " to completely step down.");
replSet.waitForState(primary, replSet.SECONDARY, secondaryCatchUpPeriodSecs * 1000);
var exitCode = stepDowner({checkExitSuccess: false});
assert.neq(0, exitCode, "expected replSetStepDown to close the shell's connection");
// The connection for the 'writer' may be closed due to the primary stepping down, or signaled
// by the main thread to quit.
writer({checkExitSuccess: false});
jsTestLog("Wait for SECONDARY " + secondary.host + " to become PRIMARY");
replSet.waitForState(secondary, replSet.PRIMARY, stepDownSecs * 1000);
})();
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