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/**
* Tests that high water mark and postBatchResumeTokens are handled correctly during upgrade from
* and downgrade to both 3.6 and a pre-backport version of 4.0 on a sharded cluster.
* @tags: [uses_change_streams]
*/
(function() {
"use strict";
load("jstests/libs/collection_drop_recreate.js"); // assertCreateCollection
load("jstests/libs/fixture_helpers.js"); // runCommandOnEachPrimary
load("jstests/multiVersion/libs/causal_consistency_helpers.js"); // supportsMajorityReadConcern
load("jstests/multiVersion/libs/change_stream_hwm_helpers.js"); // ChangeStreamHWMHelpers
load("jstests/multiVersion/libs/multi_cluster.js"); // upgradeCluster
load("jstests/multiVersion/libs/multi_rs.js"); // upgradeSet
if (!supportsMajorityReadConcern()) {
jsTestLog("Skipping test since storage engine doesn't support majority read concern.");
return;
}
const preBackport40Version = ChangeStreamHWMHelpers.preBackport40Version;
const latest40Version = ChangeStreamHWMHelpers.latest40Version;
const latest36Version = ChangeStreamHWMHelpers.latest36Version;
const st = new ShardingTest({
shards: 2,
mongos: 1,
rs: {nodes: 3},
other: {
mongosOptions: {binVersion: latest36Version},
configOptions: {binVersion: latest36Version},
rsOptions: {
binVersion: latest36Version,
setParameter: {writePeriodicNoops: true, periodicNoopIntervalSecs: 1}
},
}
});
// Obtain references to the test database via mongoS and directly on shard0.
let mongosDB = st.s.getDB(jsTestName());
let primaryShard = st.rs0.getPrimary();
// Names of each of the collections used in the course of this test.
const shardedCollName = "sharded_coll";
const unshardedCollName = "unsharded_coll";
// Updates the specified cluster components and then refreshes our references to each of them.
function refreshCluster(version, components, singleShard) {
if (singleShard) {
singleShard.upgradeSet({binVersion: version});
} else {
st.upgradeCluster(version, components);
}
// Wait for the config server and shards to become available, and restart mongoS.
st.configRS.awaitReplication();
st.rs0.awaitReplication();
st.rs1.awaitReplication();
st.restartMongoses();
// Having upgraded the cluster, reacquire references to each component.
mongosDB = st.s.getDB(jsTestName());
primaryShard = st.rs0.getPrimary();
// Re-apply the 'writePeriodicNoops' parameter to the up/downgraded shards.
const mongosAdminDB = mongosDB.getSiblingDB("admin");
FixtureHelpers.runCommandOnEachPrimary(
{db: mongosAdminDB, cmdObj: {setParameter: 1, writePeriodicNoops: true}});
}
// Enable sharding on the the test database and ensure that the primary is shard0.
assert.commandWorked(mongosDB.adminCommand({enableSharding: mongosDB.getName()}));
st.ensurePrimaryShard(mongosDB.getName(), primaryShard.name);
// Create an unsharded collection on the primary shard via mongoS.
assertCreateCollection(mongosDB, unshardedCollName);
// Create a sharded collection on {_id: 1}, split across the shards at {_id: 0}.
const collToShard = assertCreateCollection(mongosDB, shardedCollName);
st.shardColl(collToShard, {_id: 1}, {_id: 0}, {_id: 1});
// Maps used to associate collection names with collection objects and HWM tokens.
const collMap = {
[unshardedCollName]: () => st.s.getDB(jsTestName())[shardedCollName],
[shardedCollName]: () => st.s.getDB(jsTestName())[unshardedCollName]
};
/**
* Tests the behaviour of the cluster while upgrading from 'oldVersion' to 'latest40Version'.
* The 'oldVersionFCVs' parameter specifies an array of FCVs supported by 'oldVersion'; the
* upgrade/downgrade procedure will be tested with each of these FCVs.
*/
function runUpgradeDowngradeTests(oldVersion, oldVersionFCVs) {
for (let minFCV of oldVersionFCVs) {
// Create a map to record the HWMs returned by each test type.
const hwmTokenMap = {};
// We start with the cluster running on 'oldVersion'. Should not see any PBRTs.
jsTestLog(`Testing binary ${oldVersion} mongoS and shards, FCV ${minFCV}`);
refreshCluster(oldVersion);
assert.commandWorked(mongosDB.adminCommand({setFeatureCompatibilityVersion: minFCV}));
for (let collName in collMap) {
const hwmToken = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens(
{coll: collMap[collName](), expectPBRT: false});
assert.eq(hwmToken, undefined);
}
// Upgrade a single shard to 'latest40Version' but leave the mongoS on 'oldVersion'. No
// streams produce PBRTs, but the new shard should continue to produce resumable tokens
// and the old-style $sortKey while the cluster is mid-upgrade.
jsTestLog(`Upgrading shard1 to binary ${latest40Version} FCV ${minFCV}`);
refreshCluster(latest40Version, null, st.rs1);
for (let collName in collMap) {
const hwmToken = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens(
{coll: collMap[collName](), expectPBRT: false});
assert.eq(hwmToken, undefined);
}
// Upgrade the remaining shard to 'latest40Version', but leave mongoS on 'oldVersion'.
jsTestLog(
`Upgrading to ${oldVersion} mongoS and ${latest40Version} shards, FCV ${minFCV}`);
refreshCluster(latest40Version,
{upgradeMongos: false, upgradeShards: true, upgradeConfigs: true});
// The shards are upgraded to 'latest40Version' but mongoS is running 'oldVersion'. The
// mongoS should be able to merge the output from the shards, but neither mongoS stream
// will produce a PBRT.
jsTestLog(
`Testing ${oldVersion} mongoS and ${latest40Version} shards with FCV ${minFCV}`);
for (let collName in collMap) {
const hwmToken = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens(
{coll: collMap[collName](), expectPBRT: false});
assert.eq(hwmToken, undefined);
}
// Upgrade the mongoS to 'latest40Version' but leave the cluster in 'minFCV'.
jsTestLog(
`Upgrading to binary ${latest40Version} mongoS and shards with FCV ${minFCV}`);
refreshCluster(latest40Version,
{upgradeMongos: true, upgradeShards: false, upgradeConfigs: false});
// All streams should now return PBRTs, and we should obtain a valid HWM from the test.
jsTestLog(`Testing binary ${latest40Version} mongoS and shards with FCV ${minFCV}`);
for (let collName in collMap) {
hwmTokenMap[collName] = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens({
coll: collMap[collName](),
expectPBRT: true,
hwmToResume: hwmTokenMap[collName],
expectResume: true
});
assert.neq(hwmTokenMap[collName], undefined);
}
// Set the cluster's FCV to 4.0.
assert.commandWorked(mongosDB.adminCommand({setFeatureCompatibilityVersion: "4.0"}));
// All streams return PBRTs, and we can resume with the HWMs from the previous test.
jsTestLog(`Testing binary ${latest40Version} mongoS and shards with FCV 4.0`);
for (let collName in collMap) {
hwmTokenMap[collName] = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens({
coll: collMap[collName](),
expectPBRT: true,
hwmToResume: hwmTokenMap[collName],
expectResume: true
});
assert.neq(hwmTokenMap[collName], undefined);
}
// Downgrade the cluster to 'minFCV'. We should continue to produce PBRTs and can still
// resume from the tokens that we generated in the preceding tests.
jsTestLog(`Downgrading to FCV ${minFCV} shards`);
assert.commandWorked(mongosDB.adminCommand({setFeatureCompatibilityVersion: minFCV}));
jsTestLog(`Testing binary ${latest40Version} mongoS and shards with FCV ${minFCV}`);
for (let collName in collMap) {
hwmTokenMap[collName] = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens({
coll: collMap[collName](),
expectPBRT: true,
hwmToResume: hwmTokenMap[collName],
expectResume: true
});
assert.neq(hwmTokenMap[collName], undefined);
}
// Downgrade the mongoS to 'oldVersion'. We should be able to create new streams and
// resume from their tokens, but cannot resume from the previously-generated v1 tokens.
jsTestLog(`Downgrading to binary ${oldVersion} mongoS with FCV ${minFCV} shards`);
refreshCluster(oldVersion,
{upgradeMongos: true, upgradeShards: false, upgradeConfigs: false});
// We should no longer receive any PBRTs via mongoS, and we cannot resume from the HWMs.
jsTestLog(`Testing binary ${oldVersion} mongoS and binary ${latest40Version} shards`);
for (let collName in collMap) {
const hwmToken = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens({
coll: collMap[collName](),
expectPBRT: false,
hwmToResume: hwmTokenMap[collName],
expectResume: false
});
assert.eq(hwmToken, undefined);
}
// Downgrade a single shard to 'oldVersion'. We should continue to observe the same
// behaviour as we did in the previous test.
jsTestLog(`Downgrading shard1 to binary ${oldVersion} FCV ${minFCV}`);
refreshCluster(oldVersion, null, st.rs1);
for (let collName in collMap) {
const hwmToken = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens({
coll: collMap[collName](),
expectPBRT: false,
hwmToResume: hwmTokenMap[collName],
expectResume: false
});
assert.eq(hwmToken, undefined);
}
// Downgrade the remainder of the cluster to binary 'oldVersion'.
jsTestLog(`Downgrading to binary ${oldVersion} shards`);
refreshCluster(oldVersion,
{upgradeShards: true, upgradeConfigs: false, upgradeMongos: false});
refreshCluster(oldVersion,
{upgradeConfigs: true, upgradeShards: false, upgradeMongos: false});
// We should no longer receive any PBRTs, and we cannot resume from the HWM tokens.
jsTestLog(`Testing downgraded binary ${oldVersion} mongoS and shards`);
for (let collName in collMap) {
const hwmToken = ChangeStreamHWMHelpers.testPostBatchAndHighWaterMarkTokens({
coll: collMap[collName](),
expectPBRT: false,
hwmToResume: hwmTokenMap[collName],
expectResume: false
});
assert.eq(hwmToken, undefined);
}
}
}
// Run the upgrade/downgrade tests from both 3.6 and pre-backport 4.0 versions.
runUpgradeDowngradeTests(latest36Version, ["3.6"]);
runUpgradeDowngradeTests(preBackport40Version, ["3.6", "4.0"]);
st.stop();
})();
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