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/**
* Tests read preference for explain command.
*
* Test is loosely based from read_pref_cmd.js.
*/
load("jstests/replsets/rslib.js");
var assertCorrectTargeting = function(explain, isMongos, secExpected) {
assert.commandWorked(explain);
var serverInfo;
if (isMongos) {
serverInfo = explain.queryPlanner.winningPlan.shards[0].serverInfo;
} else {
serverInfo = explain.serverInfo;
}
var explainDestConn = new Mongo(serverInfo.host + ':' + serverInfo.port);
var isMaster = explainDestConn.getDB('admin').runCommand({isMaster: 1});
if (secExpected) {
assert(isMaster.secondary);
} else {
assert(isMaster.ismaster);
}
};
var testAllModes = function(conn, isMongos) {
// The primary is tagged with { tag: 'one' } and the secondary with
// { tag: 'two' } so we can test the interaction of modes and tags. Test
// a bunch of combinations.
[
// mode, tagSets, expectedHost
['primary', undefined, false],
['primary', [{}], false],
['primaryPreferred', undefined, false],
['primaryPreferred', [{tag: 'one'}], false],
// Correctly uses primary and ignores the tag
['primaryPreferred', [{tag: 'two'}], false],
['secondary', undefined, true],
['secondary', [{tag: 'two'}], true],
['secondary', [{tag: 'doesntexist'}, {}], true],
['secondary', [{tag: 'doesntexist'}, {tag: 'two'}], true],
['secondaryPreferred', undefined, true],
['secondaryPreferred', [{tag: 'one'}], false],
['secondaryPreferred', [{tag: 'two'}], true],
// We don't have a way to alter ping times so we can't predict where an
// untagged 'nearest' command should go, hence only test with tags.
['nearest', [{tag: 'one'}], false],
['nearest', [{tag: 'two'}], true]
].forEach(function(args) {
var mode = args[0], tagSets = args[1], secExpected = args[2];
var testDB = conn.getDB('TestDB');
conn.setSlaveOk(false); // purely rely on readPref
jsTest.log('Testing mode: ' + mode + ', tag sets: ' + tojson(tagSets));
// .explain().find()
var explainableQuery = testDB.user.explain().find();
explainableQuery.readPref(mode, tagSets);
var explain = explainableQuery.finish();
assertCorrectTargeting(explain, isMongos, secExpected);
// Set read pref on the connection.
var oldReadPrefMode = testDB.getMongo().getReadPrefMode();
var oldReadPrefTagSet = testDB.getMongo().getReadPrefTagSet();
try {
testDB.getMongo().setReadPref(mode, tagSets);
// .explain().count();
explain = testDB.user.explain().count();
assertCorrectTargeting(explain, isMongos, secExpected);
// .explain().distinct()
explain = testDB.user.explain().distinct("_id");
assertCorrectTargeting(explain, isMongos, secExpected);
} finally {
// Restore old read pref.
testDB.getMongo().setReadPref(oldReadPrefMode, oldReadPrefTagSet);
}
});
};
var st = new ShardingTest({shards: {rs0: {nodes: 2}}});
st.stopBalancer();
awaitRSClientHosts(st.s, st.rs0.nodes);
// Tag primary with { dc: 'ny', tag: 'one' }, secondary with { dc: 'ny', tag: 'two' }
var primary = st.rs0.getPrimary();
var secondary = st.rs0.getSecondary();
var PRIMARY_TAG = {dc: 'ny', tag: 'one'};
var SECONDARY_TAG = {dc: 'ny', tag: 'two'};
var rsConfig = primary.getDB("local").system.replset.findOne();
jsTest.log('got rsconf ' + tojson(rsConfig));
rsConfig.members.forEach(function(member) {
if (member.host == primary.host) {
member.tags = PRIMARY_TAG;
} else {
member.tags = SECONDARY_TAG;
}
});
rsConfig.version++;
jsTest.log('new rsconf ' + tojson(rsConfig));
try {
primary.adminCommand({replSetReconfig: rsConfig});
} catch (e) {
jsTest.log('replSetReconfig error: ' + e);
}
st.rs0.awaitSecondaryNodes();
// Force mongos to reconnect after our reconfig and also create the test database
assert.soon(function() {
try {
st.s.getDB('TestDB').runCommand({create: 'TestColl'});
return true;
} catch (x) {
// Intentionally caused an error that forces mongos's monitor to refresh.
jsTest.log('Caught exception while doing dummy command: ' + tojson(x));
return false;
}
});
reconnect(primary);
reconnect(secondary);
rsConfig = primary.getDB("local").system.replset.findOne();
jsTest.log('got rsconf ' + tojson(rsConfig));
var replConn = new Mongo(st.rs0.getURL());
// Make sure replica set connection is ready
_awaitRSHostViaRSMonitor(primary.name, {ok: true, tags: PRIMARY_TAG}, st.rs0.name);
_awaitRSHostViaRSMonitor(secondary.name, {ok: true, tags: SECONDARY_TAG}, st.rs0.name);
testAllModes(replConn, false);
jsTest.log('Starting test for mongos connection');
testAllModes(st.s, true);
st.stop();
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