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/**
* Tests that read operations with readConcern majority only see committed data.
*
* The following read operations are tested:
* - find command
* - aggregation
* - distinct
* - count
*
* Each operation is tested on a single node, and (if supported) through mongos on both sharded and
* unsharded collections. Mongos doesn't directly handle readConcern majority, but these tests
* should ensure that it correctly propagates the setting to the shards when running commands.
* @tags: [
* requires_majority_read_concern,
* requires_sharding,
* ]
*/
(function() {
'use strict';
// Skip metadata consistency checks since the sharded cluster is started with 0 shards
TestData.skipCheckMetadataConsistency = true;
TestData.skipCheckRoutingTableConsistency = true;
var testServer = MongoRunner.runMongod();
var db = testServer.getDB("test");
if (!db.serverStatus().storageEngine.supportsCommittedReads) {
print("Skipping read_majority.js since storageEngine doesn't support it.");
MongoRunner.stopMongod(testServer);
return;
}
MongoRunner.stopMongod(testServer);
function makeCursor(db, result) {
return new DBCommandCursor(db, result);
}
// These test cases are functions that return a cursor of the documents in collections without
// fetching them yet.
var cursorTestCases = {
find: function(coll) {
return makeCursor(coll.getDB(),
assert.commandWorked(coll.runCommand(
'find', {readConcern: {level: 'majority'}, batchSize: 0})));
},
aggregate: function(coll) {
return makeCursor(
coll.getDB(),
assert.commandWorked(coll.runCommand(
'aggregate',
{readConcern: {level: 'majority'}, cursor: {batchSize: 0}, pipeline: []})));
},
aggregateGeoNear: function(coll) {
return makeCursor(coll.getDB(), assert.commandWorked(coll.runCommand('aggregate', {
readConcern: {level: 'majority'},
cursor: {batchSize: 0},
pipeline: [{$geoNear: {near: [0, 0], distanceField: "d", spherical: true}}]
})));
},
};
// These test cases have a run method that will be passed a collection with a single object with
// _id: 1 and a state field that equals either "before" or "after". The collection will also
// contain a 2dsphere index to enable testing commands that depend on it. The return value from the
// run method is expected to be the value of expectedBefore or expectedAfter depending on the state
// of the state field.
var nonCursorTestCases = {
count_before: {
run: function(coll) {
var res = coll.runCommand('count',
{readConcern: {level: 'majority'}, query: {state: 'before'}});
assert.commandWorked(res);
return res.n;
},
expectedBefore: 1,
expectedAfter: 0,
},
count_after: {
run: function(coll) {
var res = coll.runCommand('count',
{readConcern: {level: 'majority'}, query: {state: 'after'}});
assert.commandWorked(res);
return res.n;
},
expectedBefore: 0,
expectedAfter: 1,
},
distinct: {
run: function(coll) {
var res = coll.runCommand('distinct', {readConcern: {level: 'majority'}, key: 'state'});
assert.commandWorked(res);
assert.eq(res.values.length, 1, tojson(res));
return res.values[0];
},
expectedBefore: 'before',
expectedAfter: 'after',
},
};
function runTests(coll, mongodConnection) {
function makeSnapshot() {
return assert.commandWorked(mongodConnection.adminCommand("makeSnapshot")).name;
}
function setCommittedSnapshot(snapshot) {
assert.commandWorked(mongodConnection.adminCommand({"setCommittedSnapshot": snapshot}));
}
assert.commandWorked(coll.createIndex({point: '2dsphere'}, {}, 0));
for (var testName in cursorTestCases) {
jsTestLog('Running ' + testName + ' against ' + coll.toString());
var getCursor = cursorTestCases[testName];
// Setup initial state.
assert.commandWorked(coll.remove({}));
assert.commandWorked(coll.save({_id: 1, state: 'before', point: [0, 0]}));
setCommittedSnapshot(makeSnapshot());
// Check initial conditions.
assert.eq(getCursor(coll).next().state, 'before');
// Change state without making it committed.
assert.commandWorked(coll.save({_id: 1, state: 'after', point: [0, 0]}));
// Cursor still sees old state.
assert.eq(getCursor(coll).next().state, 'before');
// Create a cursor before the update is visible.
var oldCursor = getCursor(coll);
// Making a snapshot doesn't make the update visible yet.
var snapshot = makeSnapshot();
assert.eq(getCursor(coll).next().state, 'before');
// Setting it as committed does for both new and old cursors.
setCommittedSnapshot(snapshot);
assert.eq(getCursor(coll).next().state, 'after');
assert.eq(oldCursor.next().state, 'after');
}
for (var testName in nonCursorTestCases) {
jsTestLog('Running ' + testName + ' against ' + coll.toString());
var getResult = nonCursorTestCases[testName].run;
var expectedBefore = nonCursorTestCases[testName].expectedBefore;
var expectedAfter = nonCursorTestCases[testName].expectedAfter;
// Setup initial state.
assert.commandWorked(coll.remove({}));
assert.commandWorked(coll.save({_id: 1, state: 'before', point: [0, 0]}));
setCommittedSnapshot(makeSnapshot());
// Check initial conditions.
assert.eq(getResult(coll), expectedBefore);
// Change state without making it committed.
assert.commandWorked(coll.save({_id: 1, state: 'after', point: [0, 0]}));
// Cursor still sees old state.
assert.eq(getResult(coll), expectedBefore);
// Making a snapshot doesn't make the update visible yet.
var snapshot = makeSnapshot();
assert.eq(getResult(coll), expectedBefore);
// Setting it as committed does.
setCommittedSnapshot(snapshot);
assert.eq(getResult(coll), expectedAfter);
}
}
var replTest = new ReplSetTest({
nodes: 1,
oplogSize: 2,
nodeOptions: {
setParameter: 'testingSnapshotBehaviorInIsolation=true',
enableMajorityReadConcern: '',
shardsvr: ''
}
});
replTest.startSet();
// Cannot wait for a stable recovery timestamp with 'testingSnapshotBehaviorInIsolation' set.
replTest.initiateWithAnyNodeAsPrimary(
null, "replSetInitiate", {doNotWaitForStableRecoveryTimestamp: true});
var mongod = replTest.getPrimary();
// Do a majority write to wait for a valid committed snapshot before starting the test. This is
// needed to make sure no oplog holes behind the clusterTime and all internal writes as part of the
// server startup are committed. Otherwise, manually setting the committed snapshot to the latest
// clusterTime using the `setCommittedSnapshot` command could result in reading ahead of the
// all_durable.
assert.commandWorked(mongod.getDB("test")["coll"].insert({x: 1}, {writeConcern: {w: "majority"}}));
(function testSingleNode() {
var db = mongod.getDB("singleNode");
runTests(db.collection, mongod);
})();
var shardingTest = new ShardingTest({
shards: 0,
mongos: 1,
});
assert(shardingTest.adminCommand({addShard: replTest.getURL()}));
(function testUnshardedDBThroughMongos() {
var db = shardingTest.getDB("throughMongos");
runTests(db.unshardedDB, mongod);
})();
shardingTest.adminCommand({enableSharding: 'throughMongos'});
(function testUnshardedCollectionThroughMongos() {
var db = shardingTest.getDB("throughMongos");
runTests(db.unshardedCollection, mongod);
})();
(function testShardedCollectionThroughMongos() {
var db = shardingTest.getDB("throughMongos");
var collection = db.shardedCollection;
shardingTest.adminCommand({shardCollection: collection.getFullName(), key: {_id: 1}});
runTests(collection, mongod);
})();
shardingTest.stop();
replTest.stopSet();
})();
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