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// Tests the behavior of change streams on sharded collections.
// @tags: [uses_change_streams]
(function() {
"use strict";
load('jstests/replsets/libs/two_phase_drops.js'); // For TwoPhaseDropCollectionTest.
load('jstests/aggregation/extras/utils.js'); // For assertErrorCode().
// For supportsMajorityReadConcern().
load("jstests/multiVersion/libs/causal_consistency_helpers.js");
if (!supportsMajorityReadConcern()) {
jsTestLog("Skipping test since storage engine doesn't support majority read concern.");
return;
}
const st = new ShardingTest({
shards: 2,
rs: {
nodes: 1,
enableMajorityReadConcern: '',
// Use a higher frequency for periodic noops to speed up the test.
setParameter: {periodicNoopIntervalSecs: 1}
}
});
const mongosDB = st.s0.getDB(jsTestName());
const mongosColl = mongosDB[jsTestName()];
assert.commandWorked(mongosDB.dropDatabase());
// Enable sharding on the test DB and ensure its primary is st.shard0.shardName.
assert.commandWorked(mongosDB.adminCommand({enableSharding: mongosDB.getName()}));
st.ensurePrimaryShard(mongosDB.getName(), st.rs0.getURL());
// Shard the test collection on _id.
assert.commandWorked(
mongosDB.adminCommand({shardCollection: mongosColl.getFullName(), key: {_id: 1}}));
// Split the collection into 2 chunks: [MinKey, 0), [0, MaxKey).
assert.commandWorked(
mongosDB.adminCommand({split: mongosColl.getFullName(), middle: {_id: 0}}));
// Move the [0, MaxKey) chunk to st.shard1.shardName.
assert.commandWorked(mongosDB.adminCommand(
{moveChunk: mongosColl.getFullName(), find: {_id: 1}, to: st.rs1.getURL()}));
// Write a document to each chunk.
assert.writeOK(mongosColl.insert({_id: -1}));
assert.writeOK(mongosColl.insert({_id: 1}));
let changeStream =
mongosColl.aggregate([{$changeStream: {}}, {$project: {_id: 0, clusterTime: 0}}]);
// Test that a change stream can see inserts on shard 0.
assert.writeOK(mongosColl.insert({_id: 1000}));
assert.writeOK(mongosColl.insert({_id: -1000}));
assert.soon(() => changeStream.hasNext(), "expected to be able to see the first insert");
assert.docEq(changeStream.next(), {
documentKey: {_id: 1000},
fullDocument: {_id: 1000},
ns: {db: mongosDB.getName(), coll: mongosColl.getName()},
operationType: "insert",
});
// Now do another write to shard 0, advancing that shard's clock and enabling the stream to
// return the earlier write to shard 1.
assert.writeOK(mongosColl.insert({_id: 1001}));
assert.soon(() => changeStream.hasNext(), "expected to be able to see the second insert");
assert.docEq(changeStream.next(), {
documentKey: {_id: -1000},
fullDocument: {_id: -1000},
ns: {db: mongosDB.getName(), coll: mongosColl.getName()},
operationType: "insert",
});
// Test that all changes are eventually visible due to the periodic noop writer.
assert.commandWorked(
st.rs0.getPrimary().adminCommand({setParameter: 1, writePeriodicNoops: true}));
assert.commandWorked(
st.rs1.getPrimary().adminCommand({setParameter: 1, writePeriodicNoops: true}));
assert.soon(() => changeStream.hasNext());
assert.docEq(changeStream.next(), {
documentKey: {_id: 1001},
fullDocument: {_id: 1001},
ns: {db: mongosDB.getName(), coll: mongosColl.getName()},
operationType: "insert",
});
changeStream.close();
// Test that using change streams with any stages not allowed to run on mongos results in an
// error.
assertErrorCode(
mongosColl, [{$changeStream: {}}, {$out: "shouldntWork"}], ErrorCodes.IllegalOperation);
// Test that it is legal to open a change stream, even if the
// 'internalQueryProhibitMergingOnMongos' parameter is set.
assert.commandWorked(
mongosDB.adminCommand({setParameter: 1, internalQueryProhibitMergingOnMongoS: true}));
let tempCursor = assert.doesNotThrow(() => mongosColl.aggregate([{$changeStream: {}}]));
tempCursor.close();
assert.commandWorked(
mongosDB.adminCommand({setParameter: 1, internalQueryProhibitMergingOnMongoS: false}));
// Test that $sort and $group are banned from running in a $changeStream pipeline.
assertErrorCode(mongosColl,
[{$changeStream: {}}, {$sort: {operationType: 1}}],
ErrorCodes.IllegalOperation);
assertErrorCode(mongosColl,
[{$changeStream: {}}, {$group: {_id: "$documentKey"}}],
ErrorCodes.IllegalOperation);
assert.writeOK(mongosColl.remove({}));
// We awaited the replication of the first write, so the change stream shouldn't return it.
// Use { w: "majority" } to deal with journaling correctly, even though we only have one node.
assert.writeOK(mongosColl.insert({_id: 0, a: 1}, {writeConcern: {w: "majority"}}));
changeStream = mongosColl.aggregate([{$changeStream: {}}, {$project: {"_id.clusterTime": 0}}]);
assert(!changeStream.hasNext());
// Drop the collection and test that we return a "drop" followed by an "invalidate" entry and
// close the cursor.
jsTestLog("Testing getMore command closes cursor for invalidate entries");
mongosColl.drop();
// Wait for the drop to actually happen.
assert.soon(() => !TwoPhaseDropCollectionTest.collectionIsPendingDropInDatabase(
mongosColl.getDB(), mongosColl.getName()));
assert.soon(() => changeStream.hasNext());
assert.eq(changeStream.next().operationType, "drop");
assert.soon(() => changeStream.hasNext());
assert.eq(changeStream.next().operationType, "invalidate");
assert(changeStream.isExhausted());
jsTestLog("Testing aggregate command closes cursor for invalidate entries");
// Shard the test collection on _id.
assert.commandWorked(
mongosDB.adminCommand({shardCollection: mongosColl.getFullName(), key: {_id: 1}}));
// Split the collection into 2 chunks: [MinKey, 0), [0, MaxKey).
assert.commandWorked(
mongosDB.adminCommand({split: mongosColl.getFullName(), middle: {_id: 0}}));
// Move the [0, MaxKey) chunk to st.shard1.shardName.
assert.commandWorked(mongosDB.adminCommand(
{moveChunk: mongosColl.getFullName(), find: {_id: 1}, to: st.rs1.getURL()}));
// Write one document to each chunk.
assert.writeOK(mongosColl.insert({_id: -1}, {writeConcern: {w: "majority"}}));
assert.writeOK(mongosColl.insert({_id: 1}, {writeConcern: {w: "majority"}}));
changeStream = mongosColl.aggregate([{$changeStream: {}}]);
assert(!changeStream.hasNext());
// Store a valid resume token before dropping the collection, to be used later in the test.
assert.writeOK(mongosColl.insert({_id: -2}, {writeConcern: {w: "majority"}}));
assert.writeOK(mongosColl.insert({_id: 2}, {writeConcern: {w: "majority"}}));
assert.soon(() => changeStream.hasNext());
const resumeToken = changeStream.next()._id;
mongosColl.drop();
assert.soon(() => changeStream.hasNext());
let next = changeStream.next();
assert.eq(next.operationType, "insert");
assert.eq(next.documentKey._id, 2);
assert.soon(() => changeStream.hasNext());
assert.eq(changeStream.next().operationType, "drop");
assert.soon(() => changeStream.hasNext());
assert.eq(changeStream.next().operationType, "invalidate");
// With an explicit collation, test that we can resume from before the collection drop.
changeStream = mongosColl.watch([{$project: {_id: 0}}],
{resumeAfter: resumeToken, collation: {locale: "simple"}});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "insert");
assert.eq(next.documentKey, {_id: 2});
assert.soon(() => changeStream.hasNext());
assert.eq(changeStream.next().operationType, "drop");
assert.soon(() => changeStream.hasNext());
assert.eq(changeStream.next().operationType, "invalidate");
// Without an explicit collation, test that we *cannot* resume from before the collection drop.
assert.commandFailedWithCode(mongosDB.runCommand({
aggregate: mongosColl.getName(),
pipeline: [{$changeStream: {resumeAfter: resumeToken}}],
cursor: {}
}),
ErrorCodes.InvalidResumeToken);
st.stop();
})();
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