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// Tests that mongos can autodiscover a config server replica set when the only node it knows about
// is not the primary.
load('jstests/libs/feature_compatibility_version.js');
(function() {
'use strict';
var rst = new ReplSetTest(
{name: "configRS", nodes: 3, nodeOptions: {configsvr: "", storageEngine: "wiredTiger"}});
rst.startSet();
var conf = rst.getReplSetConfig();
conf.members[1].priority = 0;
conf.members[2].priority = 0;
conf.writeConcernMajorityJournalDefault = true;
rst.initiate(conf);
// Config servers always start at the latest available FCV for the binary. This poses a problem
// when this test is run in the mixed version suite because mongos will be 'last-stable' and if
// this node is of the latest binary, it will report itself as the 'latest' FCV, which would
// cause mongos to refuse to connect to it and shutdown.
//
// In order to work around this, in the mixed version suite, be pessimistic and always set this
// node to the 'last-stable' FCV
if (jsTestOptions().shardMixedBinVersions) {
assert.commandWorked(
rst.getPrimary().adminCommand({setFeatureCompatibilityVersion: lastStableFCV}));
rst.awaitReplication();
}
var seedList = rst.name + "/" + rst.nodes[1].host; // node 1 is guaranteed to not be primary
{
// Ensure that mongos can start up when given the CSRS secondary, discover the primary, and
// perform writes to the config servers.
var mongos = MongoRunner.runMongos({configdb: seedList});
var admin = mongos.getDB('admin');
assert.writeOK(admin.foo.insert({a: 1}));
assert.eq(1, admin.foo.findOne().a);
MongoRunner.stopMongos(mongos);
}
// Wait for replication to all config server replica set members to ensure that mongos
// will be able to do majority reads when trying to verify if the initial cluster metadata
// has been properly written.
rst.awaitLastOpCommitted();
// Now take down the one electable node
rst.stop(0);
rst.awaitNoPrimary();
// Start a mongos when there is no primary
var mongos = MongoRunner.runMongos({configdb: seedList});
// Take down the one node the mongos knew about to ensure that it autodiscovered the one
// remaining
// config server
rst.stop(1);
var admin = mongos.getDB('admin');
mongos.setSlaveOk(true);
assert.eq(1, admin.foo.findOne().a);
MongoRunner.stopMongos(mongos);
rst.stopSet();
})();
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