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// In this test, we verify that nodes with the delay field specified successfully wait before
// receiving writes.
// 1. We first initiate a three-node replica set with a delayed secondary and issue a
// write to the primary. We then ensure there is indeed a delay before the delayed node receives
// this write.
// 2. Next, we issue a reconfig to add a delayed fourth node, and perform the same delay
// test as above.
// 3. Finally, we perform a reconfig to reduce the fourth node's delay from 30 seconds
// to 15 seconds, and test that the delay behavior is the same as before.
//
// @tags: [
// ]
load("jstests/replsets/rslib.js");
let doTest = function(signal) {
var name = "secondaryDelaySecs";
var host = getHostName();
var replTest = new ReplSetTest({name: name, nodes: 3});
var nodes = replTest.startSet();
/* set secondaryDelaySecs to 30 seconds */
var config = replTest.getReplSetConfig();
config.members[2].priority = 0;
config.members[2].secondaryDelaySecs = 30;
replTest.initiate(config);
var primary = replTest.getPrimary().getDB(name);
// The default WC is majority and this test can't satisfy majority writes.
assert.commandWorked(primary.adminCommand(
{setDefaultRWConcern: 1, defaultWriteConcern: {w: 1}, writeConcern: {w: "majority"}}));
replTest.awaitReplication();
var secondaryConns = replTest.getSecondaries();
var secondaries = [];
for (var i in secondaryConns) {
var d = secondaryConns[i].getDB(name);
secondaries.push(d);
}
waitForAllMembers(primary);
// insert a record
assert.commandWorked(primary.foo.insert({x: 1}, {writeConcern: {w: 2}}));
var doc = primary.foo.findOne();
assert.eq(doc.x, 1);
// make sure secondary has it
var doc = secondaries[0].foo.findOne();
assert.eq(doc.x, 1);
// make sure delayed secondary doesn't have it
for (var i = 0; i < 8; i++) {
assert.eq(secondaries[1].foo.findOne(), null);
sleep(1000);
}
// within 120 seconds delayed secondary should have it
assert.soon(function() {
var z = secondaries[1].foo.findOne();
return z && z.x == 1;
}, 'waiting for inserted document ' + tojson(doc) + ' on delayed secondary', 120 * 1000);
/************* Part 2 *******************/
// how about if we add a new server? will it sync correctly?
let conn = replTest.add();
config = primary.getSiblingDB("local").system.replset.findOne();
printjson(config);
config.version++;
config.members.push({
_id: 3,
host: host + ":" + replTest.ports[replTest.ports.length - 1],
priority: 0,
secondaryDelaySecs: 30
});
primary = reconfig(replTest, config);
primary = primary.getSiblingDB(name);
assert.commandWorked(primary.foo.insert(
{_id: 123, x: 'foo'}, {writeConcern: {w: 2, wtimeout: ReplSetTest.kDefaultTimeoutMS}}));
for (var i = 0; i < 8; i++) {
assert.eq(conn.getDB(name).foo.findOne({_id: 123}), null);
sleep(1000);
}
assert.soon(function() {
var z = conn.getDB(name).foo.findOne({_id: 123});
return z != null && z.x == "foo";
});
/************* Part 3 ******************/
print("reconfigure the delay field");
config.version++;
config.members[3].secondaryDelaySecs = 15;
reconfig(replTest, config);
primary = replTest.getPrimary().getDB(name);
assert.soon(function() {
return conn.getDB("local").system.replset.findOne().version == config.version;
});
// wait for node to become secondary
assert.soon(function() {
var result = conn.getDB("admin").hello();
printjson(result);
return result.secondary;
});
print("testing insert");
primary.foo.insert({_id: 124, "x": "foo"});
assert(primary.foo.findOne({_id: 124}) != null);
for (var i = 0; i < 10; i++) {
assert.eq(conn.getDB(name).foo.findOne({_id: 124}), null);
sleep(1000);
}
assert.soon(function() {
return conn.getDB(name).foo.findOne({_id: 124}) != null;
}, "findOne should complete within default timeout");
replTest.stopSet();
};
doTest(15);
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