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// Tests metadata notifications of change streams on sharded collections.
// Legacy getMore fails after dropping the database that the original cursor is on.
// @tags: [requires_find_command]
(function() {
"use strict";
load("jstests/libs/collection_drop_recreate.js"); // For assertDropAndRecreateCollection.
load('jstests/replsets/libs/two_phase_drops.js'); // For TwoPhaseDropCollectionTest.
// 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: '',
}
});
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 a field called 'shardKey'.
assert.commandWorked(
mongosDB.adminCommand({shardCollection: mongosColl.getFullName(), key: {shardKey: 1}}));
// Split the collection into 2 chunks: [MinKey, 0), [0, MaxKey].
assert.commandWorked(
mongosDB.adminCommand({split: mongosColl.getFullName(), middle: {shardKey: 0}}));
// Move the [0, MaxKey] chunk to st.shard1.shardName.
assert.commandWorked(mongosDB.adminCommand(
{moveChunk: mongosColl.getFullName(), find: {shardKey: 1}, to: st.rs1.getURL()}));
// Write a document to each chunk.
assert.writeOK(mongosColl.insert({shardKey: -1, _id: -1}, {writeConcern: {w: "majority"}}));
assert.writeOK(mongosColl.insert({shardKey: 1, _id: 1}, {writeConcern: {w: "majority"}}));
let changeStream = mongosColl.watch();
// We awaited the replication of the first writes, so the change stream shouldn't return them.
assert.writeOK(mongosColl.update({shardKey: -1, _id: -1}, {$set: {updated: true}}));
assert.writeOK(mongosColl.update({shardKey: 1, _id: 1}, {$set: {updated: true}}));
assert.writeOK(mongosColl.insert({shardKey: 2, _id: 2}));
// Drop the collection and test that we return a "drop" entry, followed by an "invalidate"
// entry.
mongosColl.drop();
// Test that we see the two writes that happened before the collection drop.
assert.soon(() => changeStream.hasNext());
let next = changeStream.next();
assert.eq(next.operationType, "update");
assert.eq(next.documentKey.shardKey, -1);
const resumeTokenFromFirstUpdate = next._id;
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "update");
assert.eq(next.documentKey.shardKey, 1);
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "insert");
assert.eq(next.documentKey, {_id: 2});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "drop");
assert.eq(next.ns, {db: mongosDB.getName(), coll: mongosColl.getName()});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "invalidate");
assert(changeStream.isExhausted());
// With an explicit collation, test that we can resume from before the collection drop.
changeStream =
mongosColl.watch([], {resumeAfter: resumeTokenFromFirstUpdate, collation: {locale: "simple"}});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "update");
assert.eq(next.documentKey, {shardKey: 1, _id: 1});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "insert");
assert.eq(next.documentKey, {shardKey: 2, _id: 2});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "drop");
assert.eq(next.ns, {db: mongosDB.getName(), coll: mongosColl.getName()});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "invalidate");
assert(changeStream.isExhausted());
// Test that we can resume the change stream without specifying an explicit collation.
assert.commandWorked(mongosDB.runCommand({
aggregate: mongosColl.getName(),
pipeline: [{$changeStream: {resumeAfter: resumeTokenFromFirstUpdate}}],
cursor: {}
}));
// Recreate and shard the collection.
assert.commandWorked(mongosDB.createCollection(mongosColl.getName()));
// Shard the test collection on shardKey.
assert.commandWorked(
mongosDB.adminCommand({shardCollection: mongosColl.getFullName(), key: {shardKey: 1}}));
// Test that resuming the change stream on the recreated collection succeeds, since we will not
// attempt to inherit the collection's default collation and can therefore ignore the new UUID.
assert.commandWorked(mongosDB.runCommand({
aggregate: mongosColl.getName(),
pipeline: [{$changeStream: {resumeAfter: resumeTokenFromFirstUpdate}}],
cursor: {}
}));
// Recreate the collection as unsharded and open a change stream on it.
assertDropAndRecreateCollection(mongosDB, mongosColl.getName());
changeStream = mongosColl.watch();
// Drop the database and verify that the stream returns a collection drop followed by an
// invalidate.
assert.commandWorked(mongosDB.dropDatabase());
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "drop");
assert.eq(next.ns, {db: mongosDB.getName(), coll: mongosColl.getName()});
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "invalidate");
assert(changeStream.isExhausted());
st.stop();
})();
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