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// Tests the behavior of a change stream on a whole database in a sharded cluster.
// @tags: [
// requires_majority_read_concern,
// uses_change_streams,
// ]
(function() {
"use strict";
load('jstests/replsets/libs/two_phase_drops.js'); // For TwoPhaseDropCollectionTest.
load('jstests/aggregation/extras/utils.js'); // For assertErrorCode().
load('jstests/libs/change_stream_util.js'); // For ChangeStreamTest.
load("jstests/libs/collection_drop_recreate.js"); // For assertDropCollection.
const st = new ShardingTest({
shards: 2,
rs: {
nodes: 1,
// Use a higher frequency for periodic noops to speed up the test.
setParameter: {periodicNoopIntervalSecs: 1, writePeriodicNoops: true}
}
});
const mongosDB = st.s0.getDB("test");
const mongosColl = mongosDB[jsTestName()];
let cst = new ChangeStreamTest(mongosDB);
let cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: 1});
// Test that if there are no changes, we return an empty batch.
assert.eq(0, cursor.firstBatch.length, "Cursor had changes: " + tojson(cursor));
// Test that the change stream returns operations on the unsharded test collection.
assert.commandWorked(mongosColl.insert({_id: 0}));
let expected = {
documentKey: {_id: 0},
fullDocument: {_id: 0},
ns: {db: mongosDB.getName(), coll: mongosColl.getName()},
operationType: "insert",
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
// Create a new sharded collection.
mongosDB.createCollection(jsTestName() + "_sharded_on_x");
const mongosCollShardedOnX = mongosDB[jsTestName() + "_sharded_on_x"];
// Shard, split, and move one chunk to shard1.
st.shardColl(mongosCollShardedOnX.getName(), {x: 1}, {x: 0}, {x: 1}, mongosDB.getName());
// Write a document to each chunk.
assert.commandWorked(mongosCollShardedOnX.insert({_id: 0, x: -1}));
assert.commandWorked(mongosCollShardedOnX.insert({_id: 1, x: 1}));
// Verify that the change stream returns both inserts.
expected = [
{
documentKey: {_id: 0, x: -1},
fullDocument: {_id: 0, x: -1},
ns: {db: mongosDB.getName(), coll: mongosCollShardedOnX.getName()},
operationType: "insert",
},
{
documentKey: {_id: 1, x: 1},
fullDocument: {_id: 1, x: 1},
ns: {db: mongosDB.getName(), coll: mongosCollShardedOnX.getName()},
operationType: "insert",
}
];
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: expected});
// Now send inserts to both the sharded and unsharded collections, and verify that the change
// streams returns them in order.
assert.commandWorked(mongosCollShardedOnX.insert({_id: 2, x: 2}));
assert.commandWorked(mongosColl.insert({_id: 1}));
// Verify that the change stream returns both inserts.
expected = [
{
documentKey: {_id: 2, x: 2},
fullDocument: {_id: 2, x: 2},
ns: {db: mongosDB.getName(), coll: mongosCollShardedOnX.getName()},
operationType: "insert",
},
{
documentKey: {_id: 1},
fullDocument: {_id: 1},
ns: {db: mongosDB.getName(), coll: mongosColl.getName()},
operationType: "insert",
}
];
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: expected});
// Create a third sharded collection with a compound shard key.
mongosDB.createCollection(jsTestName() + "_sharded_compound");
const mongosCollShardedCompound = mongosDB[jsTestName() + "_sharded_compound"];
// Shard, split, and move one chunk to shard1.
st.shardColl(mongosCollShardedCompound.getName(),
{y: 1, x: 1},
{y: 1, x: MinKey},
{y: 1, x: MinKey},
mongosDB.getName());
// Write a document to each chunk.
assert.commandWorked(mongosCollShardedCompound.insert({_id: 0, y: -1, x: 0}));
assert.commandWorked(mongosCollShardedCompound.insert({_id: 1, y: 1, x: 0}));
// Verify that the change stream returns both inserts.
expected = [
{
documentKey: {_id: 0, y: -1, x: 0},
fullDocument: {_id: 0, y: -1, x: 0},
ns: {db: mongosDB.getName(), coll: mongosCollShardedCompound.getName()},
operationType: "insert",
},
{
documentKey: {_id: 1, y: 1, x: 0},
fullDocument: {_id: 1, y: 1, x: 0},
ns: {db: mongosDB.getName(), coll: mongosCollShardedCompound.getName()},
operationType: "insert",
}
];
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: expected});
// Send inserts to all 3 collections and verify that the results contain the correct
// documentKeys and are in the correct order.
assert.commandWorked(mongosCollShardedOnX.insert({_id: 3, x: 3}));
assert.commandWorked(mongosColl.insert({_id: 3}));
assert.commandWorked(mongosCollShardedCompound.insert({_id: 2, x: 0, y: -2}));
// Verify that the change stream returns both inserts.
expected = [
{
documentKey: {_id: 3, x: 3},
fullDocument: {_id: 3, x: 3},
ns: {db: mongosDB.getName(), coll: mongosCollShardedOnX.getName()},
operationType: "insert",
},
{
documentKey: {_id: 3},
fullDocument: {_id: 3},
ns: {db: mongosDB.getName(), coll: mongosColl.getName()},
operationType: "insert",
},
{
documentKey: {_id: 2, x: 0, y: -2},
fullDocument: {_id: 2, x: 0, y: -2},
ns: {db: mongosDB.getName(), coll: mongosCollShardedCompound.getName()},
operationType: "insert",
},
];
const results = cst.assertNextChangesEqual({cursor: cursor, expectedChanges: expected});
// Store the resume token of the first insert to use after dropping the collection.
const resumeTokenBeforeDrop = results[0]._id;
// Write one more document to the collection that will be dropped, to be returned after
// resuming.
assert.commandWorked(mongosCollShardedOnX.insert({_id: 4, x: 4}));
// Drop the collection, invalidating the open change stream.
assertDropCollection(mongosDB, mongosCollShardedOnX.getName());
// Resume the change stream from before the collection drop, and verify that the documentKey
// field contains the extracted shard key from the resume token.
cursor = cst.startWatchingChanges({
pipeline: [
{$changeStream: {resumeAfter: resumeTokenBeforeDrop}},
{$match: {"ns.coll": mongosCollShardedOnX.getName()}}
],
collection: 1
});
cst.assertNextChangesEqual({
cursor: cursor,
expectedChanges: [
{
documentKey: {_id: 4, x: 4},
fullDocument: {_id: 4, x: 4},
ns: {db: mongosDB.getName(), coll: mongosCollShardedOnX.getName()},
operationType: "insert",
},
]
});
cst.cleanUp();
st.stop();
})();
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