mongodb/jstests/sharding/count_config_servers.js

/**
 * Test count commands against the config servers, including when some of them are down.
 * This test fails when run with authentication due to SERVER-6327
 */

// Checking UUID consistency requires querying the config primary, but this test shuts down 2 out of
// the 3 config servers. Therefore, we cannot do the check on this test.
TestData.skipCheckingUUIDsConsistentAcrossCluster = true;

(function() {
"use strict";

var st = new ShardingTest({name: 'sync_conn_cmd', shards: 0});
st.s.setSlaveOk(true);

var configDB = st.config;
var coll = configDB.test;

for (var x = 0; x < 10; x++) {
    assert.writeOK(coll.insert({v: x}));
}

if (st.configRS) {
    // Make sure the inserts are replicated to all config servers.
    st.configRS.awaitReplication();
}

var testNormalCount = function() {
    var cmdRes = configDB.runCommand({count: coll.getName()});
    assert(cmdRes.ok);
    assert.eq(10, cmdRes.n);
};

var testCountWithQuery = function() {
    var cmdRes = configDB.runCommand({count: coll.getName(), query: {v: {$gt: 6}}});
    assert(cmdRes.ok);
    assert.eq(3, cmdRes.n);
};

// Use invalid query operator to make the count return error
var testInvalidCount = function() {
    var cmdRes = configDB.runCommand({count: coll.getName(), query: {$c: {$abc: 3}}});
    assert(!cmdRes.ok);
    assert(cmdRes.errmsg.length > 0);
};

// Test with all config servers up
testNormalCount();
testCountWithQuery();
testInvalidCount();

// Test with the first config server down
MongoRunner.stopMongod(st.c0);

testNormalCount();
testCountWithQuery();
testInvalidCount();

// Test with the first and second config server down
MongoRunner.stopMongod(st.c1);
jsTest.log('Second server is down');

testNormalCount();
testCountWithQuery();
testInvalidCount();

st.stop();
}());