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/**
* Tests that `onCurrentShardSince` is always consistent with `history[0].validAfter` on
* config.chunks entries
*
* TODO (SERVER-72791) remove multiversion_incompatible, featureFlagAutoMerger and
* does_not_support_stepdowns flags since they are required only for upgradeFCVTest
* @tags: [multiversion_incompatible, featureFlagAutoMerger, does_not_support_stepdowns]
*/
(function() {
'use strict';
load("jstests/libs/feature_flag_util.js");
load("jstests/sharding/libs/find_chunks_util.js");
Random.setRandomSeed();
/* Create new sharded collection on testDB with 111 initial chunks*/
let _collCounter = 0;
function newShardedColl(st, testDB) {
const collNamePrefix = 'coll';
const coll = testDB[collNamePrefix + '_' + _collCounter++];
assert.commandWorked(st.s.adminCommand({
shardCollection: coll.getFullName(),
key: {x: "hashed"},
numInitialChunks: 111,
}));
return coll;
}
/* Perform up to 5 random chunk moves */
function performRandomMoveChunks(coll) {
const collUuid = st.s.getDB("config").collections.findOne({_id: coll.getFullName()}).uuid;
function getOppositeShard(shardName) {
if (shardName === st.shard0.shardName) {
return st.shard1.shardName;
} else {
return st.shard0.shardName;
}
}
const numMoves = Math.floor(Math.random() * 5);
for (let i = 0; i < numMoves; i++) {
const chunks = chunksColl.find({"uuid": collUuid}).sort({min: 1}).toArray();
const chunk = chunks[Math.floor(Math.random() * chunks.length)];
assert.commandWorked(st.s.adminCommand(
{moveChunk: coll.getFullName(), find: chunk.min, to: getOppositeShard(chunk.shard)}));
}
}
/* Verifies that `onCurrentShardSince` is set and it has the same value as
* `history[0].validAfter` for each chunk
*/
function assertChunksConsistency(chunksColl) {
const numTotalChunks = chunksColl.find().count();
assert.neq(0, numTotalChunks);
const numConsistenChunks =
chunksColl
.find({
$and: [
{"onCurrentShardSince": {$exists: 1}},
{
$expr: {
$eq: [
"$onCurrentShardSince",
{$getField: {field: "validAfter", input: {$first: "$history"}}}
]
}
}
]
})
.count();
assert.eq(numTotalChunks, numConsistenChunks);
}
/* Upgrade FCV test
* The upgrade procedure must add the new field `onCurrentShardSince` to all chunks
* TODO (SERVER-72791) remove this test after v7.0 becomes lastLTS
*/
function upgradeFCVTest(st, chunksColl, testDB) {
// Downgrade to the lastLTSFCV to force an upgrade afterwards
assert.commandWorked(st.s.adminCommand({setFeatureCompatibilityVersion: lastLTSFCV}));
// Create several chunks on different collections and perform some random moves to have
// different values on `onCurrentShardSince` fields
for (let i = 0; i < 10; i++) {
const coll = newShardedColl(st, testDB);
performRandomMoveChunks(coll);
}
assert.commandWorked(st.s.adminCommand({setFeatureCompatibilityVersion: latestFCV}));
assertChunksConsistency(chunksColl);
}
function moveAndMergeChunksTest(st, chunksColl, testDB) {
const coll = newShardedColl(st, testDB);
const collUuid = st.s.getDB("config").collections.findOne({_id: coll.getFullName()}).uuid;
// Perform some random moves to have different values on `onCurrentShardSince` fields
performRandomMoveChunks(coll);
assertChunksConsistency(chunksColl);
// Perform at most 10 random merges
for (let i = 0; i < 10; i++) {
const chunks = chunksColl.find({"uuid": collUuid}).sort({min: 1}).toArray();
const firstChunkToMergeIndex = Math.floor(Math.random() * (chunks.length - 3));
const firstChunk = chunks[firstChunkToMergeIndex];
let lastChunkToMergeIndex = firstChunkToMergeIndex;
for (let j = 0; j < 3; j++) {
if (chunks[lastChunkToMergeIndex + 1].shard !== firstChunk.shard) {
break;
}
lastChunkToMergeIndex++;
}
if (firstChunkToMergeIndex === lastChunkToMergeIndex) {
continue;
}
const lastChunk = chunks[lastChunkToMergeIndex];
assert.commandWorked(st.s.adminCommand(
{mergeChunks: coll.getFullName(), bounds: [firstChunk.min, lastChunk.max]}));
}
assertChunksConsistency(chunksColl);
}
function splitChunksTest(st, chunksColl, testDB) {
const coll = newShardedColl(st, testDB);
// Perform some random moves to have different values on `onCurrentShardSince` fields
performRandomMoveChunks(coll);
assertChunksConsistency(chunksColl);
// Perform at most 10 random splits
for (let i = 0; i < 10; i++) {
// pick a random split point between -50000 and 50000
const splitPoint = Math.floor(Math.random() * 100000 - 50000);
if (chunksColl.find({"min": {x: NumberLong(splitPoint)}}).count() != 0) {
continue;
}
assert.commandWorked(
st.s.adminCommand({split: coll.getFullName(), middle: {x: NumberLong(splitPoint)}}));
}
assertChunksConsistency(chunksColl);
}
/* Test setup */
const st = new ShardingTest({mongos: 1, shards: 2});
const chunksColl = st.config.chunks;
const testDB = st.s.getDB(jsTestName());
/* Perform tests */
if (!TestData.configShard) {
upgradeFCVTest(st, chunksColl, testDB);
moveAndMergeChunksTest(st, chunksColl, testDB);
splitChunksTest(st, chunksColl, testDB);
}
st.stop();
})();
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