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// Ensures that if the primary config server is blackholed from the point of view of mongos, CRUD
// and read-only config operations continue to work.
(function() {
'use strict';
var st = new ShardingTest({shards: 2, mongos: 1, useBridge: true});
var testDB = st.s.getDB('BlackHoleDB');
var configDB = st.s.getDB('config');
assert.commandWorked(testDB.adminCommand({enableSharding: 'BlackHoleDB'}));
assert.commandWorked(
testDB.adminCommand({shardCollection: testDB.ShardedColl.getFullName(), key: {_id: 1}}));
var bulk = testDB.ShardedColl.initializeUnorderedBulkOp();
for (var i = 0; i < 1000; i++) {
bulk.insert({_id: i});
}
assert.writeOK(bulk.execute());
const configPrimary = st.configRS.getPrimary();
const admin = configPrimary.getDB("admin");
// Set the priority and votes to 0 for secondary config servers so that in the case
// of an election, they cannot step up. If a different node were to step up, the
// config server would no longer be blackholed from mongos.
let conf = admin.runCommand({replSetGetConfig: 1}).config;
for (let i = 0; i < conf.members.length; i++) {
if (conf.members[i].host !== configPrimary.host) {
conf.members[i].votes = 0;
conf.members[i].priority = 0;
}
}
conf.version++;
const response = admin.runCommand({replSetReconfig: conf});
assert.commandWorked(response);
jsTest.log('Partitioning the config server primary from the mongos');
configPrimary.discardMessagesFrom(st.s, 1.0);
st.s.discardMessagesFrom(configPrimary, 1.0);
assert.commandWorked(testDB.adminCommand({flushRouterConfig: 1}));
// This should fail, because the primary is not available
jsTest.log('Doing write operation on a new database and collection');
assert.writeError(st.s.getDB('NonExistentDB')
.TestColl.insert({_id: 0, value: 'This value will never be inserted'},
{maxTimeMS: 15000}));
jsTest.log('Doing CRUD operations on the sharded collection');
assert.eq(1000, testDB.ShardedColl.find().itcount());
assert.writeOK(testDB.ShardedColl.insert({_id: 1000}));
assert.eq(1001, testDB.ShardedColl.find().count());
jsTest.log('Doing read operations on a config server collection');
// Should fail due to primary read preference
assert.throws(function() {
configDB.chunks.find().itcount();
});
assert.throws(function() {
configDB.chunks.find().count();
});
assert.throws(function() {
configDB.chunks.aggregate().itcount();
});
// With secondary read pref config server reads should work
st.s.setReadPref('secondary');
assert.lt(0, configDB.chunks.find().itcount());
assert.lt(0, configDB.chunks.find().count());
assert.lt(0, configDB.chunks.aggregate().itcount());
st.stop();
}());
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