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// Tests the behavior of looking up the post image for change streams on collections which are
// sharded with a compound shard key.
(function() {
"use strict";
// 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: {writePeriodicNoops: true, periodicNoopIntervalSecs: 1}
}
});
const mongosDB = st.s0.getDB(jsTestName());
const mongosColl = mongosDB['coll'];
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 with a compound shard key: a, b, c. Then split it into two chunks,
// and put one chunk on each shard.
assert.commandWorked(mongosDB.adminCommand(
{shardCollection: mongosColl.getFullName(), key: {a: 1, b: 1, c: 1}}));
// Split the collection into 2 chunks:
// [{a: MinKey, b: MinKey, c: MinKey}, {a: 1, b: MinKey, c: MinKey})
// and
// [{a: 1, b: MinKey, c: MinKey}, {a: MaxKey, b: MaxKey, c: MaxKey}).
assert.commandWorked(mongosDB.adminCommand(
{split: mongosColl.getFullName(), middle: {a: 1, b: MinKey, c: MinKey}}));
// Move the upper chunk to shard 1.
assert.commandWorked(mongosDB.adminCommand({
moveChunk: mongosColl.getFullName(),
find: {a: 1, b: MinKey, c: MinKey},
to: st.rs1.getURL()
}));
const changeStream = mongosColl.aggregate([{$changeStream: {fullDocument: "updateLookup"}}]);
const nDocs = 6;
const bValues = ["one", "two", "three", "four", "five", "six"];
// This shard key function results in 1/3rd of documents on shard0 and 2/3rds on shard1.
function shardKeyFromId(id) {
return {a: id % 3, b: bValues[id], c: id % 2};
}
// Do some writes.
for (let id = 0; id < nDocs; ++id) {
const documentKey = Object.merge({_id: id}, shardKeyFromId(id));
assert.writeOK(mongosColl.insert(documentKey));
assert.writeOK(mongosColl.update(documentKey, {$set: {updatedCount: 1}}));
}
for (let id = 0; id < nDocs; ++id) {
assert.soon(() => changeStream.hasNext());
let next = changeStream.next();
assert.eq(next.operationType, "insert");
assert.eq(next.documentKey, Object.merge(shardKeyFromId(id), {_id: id}));
assert.soon(() => changeStream.hasNext());
next = changeStream.next();
assert.eq(next.operationType, "update");
assert.eq(next.documentKey, Object.merge(shardKeyFromId(id), {_id: id}));
assert.docEq(next.fullDocument,
Object.merge(shardKeyFromId(id), {_id: id, updatedCount: 1}));
}
// Test that the change stream can still see the updated post image, even if a chunk is
// migrated.
for (let id = 0; id < nDocs; ++id) {
const documentKey = Object.merge({_id: id}, shardKeyFromId(id));
assert.writeOK(mongosColl.update(documentKey, {$set: {updatedCount: 2}}));
}
// Move the upper chunk back to shard 0.
assert.commandWorked(mongosDB.adminCommand({
moveChunk: mongosColl.getFullName(),
find: {a: 1, b: MinKey, c: MinKey},
to: st.rs0.getURL()
}));
for (let id = 0; id < nDocs; ++id) {
assert.soon(() => changeStream.hasNext());
let next = changeStream.next();
assert.eq(next.operationType, "update");
assert.eq(next.documentKey, Object.merge(shardKeyFromId(id), {_id: id}));
assert.docEq(next.fullDocument,
Object.merge(shardKeyFromId(id), {_id: id, updatedCount: 2}));
}
st.stop();
})();
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