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/**
* Tests that $out and $merge with readConcern majority will only see committed data.
*
* 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';
const testServer = MongoRunner.runMongod();
const 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 runTests(sourceColl, mongodConnection) {
function makeSnapshot() {
return assert.commandWorked(mongodConnection.adminCommand("makeSnapshot")).name;
}
function setCommittedSnapshot(snapshot) {
assert.commandWorked(mongodConnection.adminCommand({"setCommittedSnapshot": snapshot}));
}
const db = sourceColl.getDB();
const targetColl = db.targetColl;
const targetReplaceDocsColl = db.targetReplaceDocsColl;
assert.commandWorked(sourceColl.remove({}));
assert.commandWorked(targetColl.remove({}));
assert.commandWorked(targetReplaceDocsColl.remove({}));
setCommittedSnapshot(makeSnapshot());
// Insert a single document and make it visible by advancing the snapshot.
assert.commandWorked(sourceColl.insert({_id: 1, state: 'before'}));
assert.commandWorked(targetReplaceDocsColl.insert({_id: 1, state: 'before'}));
setCommittedSnapshot(makeSnapshot());
// This insert will not be visible to $merge.
assert.commandWorked(sourceColl.insert({_id: 2, state: 'before'}));
assert.commandWorked(targetReplaceDocsColl.insert({_id: 2, state: 'before'}));
// Similarly this update will not be visible.
assert.commandWorked(sourceColl.update({_id: 1}, {state: 'after'}));
assert.commandWorked(targetReplaceDocsColl.update({_id: 1}, {state: 'after'}));
// Make sure we see only the first document.
let res = sourceColl.aggregate([], {readConcern: {level: 'majority'}});
assert.eq(res.itcount(), 1);
// Run $merge with whenNotMatched set to "insert". It will pick only the first document.
// Also it will not see the update ('after').
res = sourceColl.aggregate(
[
{$match: {state: 'before'}},
{$project: {state: 'merge'}},
{
$merge: {
into: {db: targetColl.getDB().getName(), coll: targetColl.getName()},
whenMatched: "fail",
whenNotMatched: "insert"
}
}
],
{readConcern: {level: 'majority'}});
assert.eq(res.itcount(), 0);
res = targetColl.find().sort({_id: 1});
// Only a single document is visible ($merge did not see the second insert).
assert.docEq(res.next(), {_id: 1, state: 'merge'});
assert(res.isExhausted());
// The same $merge but with whenMatched set to "replace".
res = sourceColl.aggregate(
[
{$match: {state: 'before'}},
{$project: {state: 'merge'}},
{
$merge: {
into: {
db: targetReplaceDocsColl.getDB().getName(),
coll: targetReplaceDocsColl.getName()
},
whenMatched: "replace",
whenNotMatched: "insert"
}
}
],
{readConcern: {level: 'majority'}});
assert.eq(res.itcount(), 0);
setCommittedSnapshot(makeSnapshot());
res = targetReplaceDocsColl.find().sort({_id: 1});
// The first document must overwrite the update that the read portion of $merge did not see.
assert.docEq(res.next(), {_id: 1, state: 'merge'});
// The second document is the result of the independent insert that $merge did not see.
assert.docEq(res.next(), {_id: 2, state: 'before'});
assert(res.isExhausted());
assert.commandWorked(targetColl.remove({}));
setCommittedSnapshot(makeSnapshot());
// Insert a document that will collide with $merge insert. The insert is not majority
// commited.
assert.commandWorked(targetColl.insert({_id: 1, state: 'collision'}));
res = db.runCommand({
aggregate: sourceColl.getName(),
pipeline: [
{$project: {state: 'merge'}},
{
$merge: {
into: {db: targetColl.getDB().getName(), coll: targetColl.getName()},
whenMatched: "fail",
whenNotMatched: "insert"
}
}
],
cursor: {},
readConcern: {level: 'majority'}
});
assert.commandFailedWithCode(res, ErrorCodes.DuplicateKey);
// Remove the documents (not majority).
assert.commandWorked(targetColl.remove({_id: 1}));
assert.commandWorked(targetColl.remove({_id: 2}));
// $merge should successfuly 'overwrite' the collection as it is 'empty' (not majority).
res = targetReplaceDocsColl.aggregate(
[
{$match: {state: 'before'}},
{$project: {state: 'merge'}},
{
$merge: {
into: {db: targetColl.getDB().getName(), coll: targetColl.getName()},
whenMatched: "fail",
whenNotMatched: "insert"
}
}
],
{readConcern: {level: 'majority'}});
assert.eq(res.itcount(), 0);
setCommittedSnapshot(makeSnapshot());
res = targetColl.find().sort({_id: 1});
// Only a single document is visible ($merge did not see the second insert).
assert.docEq(res.next(), {_id: 2, state: 'merge'});
assert(res.isExhausted());
}
const 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});
const mongod = replTest.getPrimary();
(function testSingleNode() {
const db = mongod.getDB("singleNode");
runTests(db.collection, mongod);
})();
const shardingTest = new ShardingTest({
shards: 0,
mongos: 1,
});
assert(shardingTest.adminCommand({addShard: replTest.getURL()}));
(function testUnshardedDBThroughMongos() {
const db = shardingTest.getDB("throughMongos");
runTests(db.unshardedDB, mongod);
})();
shardingTest.adminCommand({enableSharding: 'throughMongos'});
(function testUnshardedCollectionThroughMongos() {
const db = shardingTest.getDB("throughMongos");
runTests(db.unshardedCollection, mongod);
})();
(function testShardedCollectionThroughMongos() {
const db = shardingTest.getDB("throughMongos");
const collection = db.shardedCollection;
shardingTest.adminCommand({shardCollection: collection.getFullName(), key: {_id: 1}});
runTests(collection, mongod);
})();
shardingTest.stop();
replTest.stopSet();
})();
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