jstests/sharding/read_pref_multi_mongos_stale_config.js


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// Tests that a mongos will correctly retry a stale shard version when read preference is used
(function() {
'use strict';

var st = new ShardingTest({
    shards: {rs0: {quiet: ''}, rs1: {quiet: ''}},
    mongos: 2,
    other: {mongosOptions: {verbose: 2}}
});

var testDB1 = st.s0.getDB('test');
var testDB2 = st.s1.getDB('test');

// Trigger a query on mongos 1 so it will have a view of test.user as being unsharded.
testDB1.user.findOne();

assert.commandWorked(testDB2.adminCommand({enableSharding: 'test'}));
assert.commandWorked(testDB2.adminCommand({shardCollection: 'test.user', key: {x: 1}}));
assert.commandWorked(testDB2.adminCommand({split: 'test.user', middle: {x: 100}}));

var configDB2 = st.s1.getDB('config');
var chunkToMove = configDB2.chunks.find().sort({min: 1}).next();
var toShard = configDB2.shards.findOne({_id: {$ne: chunkToMove.shard}})._id;
assert.commandWorked(testDB2.adminCommand({moveChunk: 'test.user', to: toShard, find: {x: 50}}));

// Insert a document into each chunk
assert.commandWorked(testDB2.user.insert({x: 30}));
assert.commandWorked(testDB2.user.insert({x: 130}));

// The testDB1 mongos does not know the chunk has been moved, and will retry
var cursor = testDB1.user.find({x: 30}).readPref('primary');
assert(cursor.hasNext());
assert.eq(30, cursor.next().x);

cursor = testDB1.user.find({x: 130}).readPref('primary');
assert(cursor.hasNext());
assert.eq(130, cursor.next().x);

st.stop();
})();