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/**
* Test that we correctly use the index created when a time series collection is sharded.
*
* @tags: [
* requires_fcv_51,
* requires_sharding,
* ]
*/
(function() {
"use strict";
load("jstests/core/timeseries/libs/timeseries.js");
load("jstests/libs/analyze_plan.js"); // For getAggPlanStage
Random.setRandomSeed();
const dbName = 'testDB';
const collName = 'timeseries_sort';
const timeField = 't';
const metaField = 'm';
const bucketsCollName = `system.buckets.${collName}`;
const fullBucketsCollName = `${dbName}.system.buckets.${collName}`;
const st = new ShardingTest({shards: 2});
const sDB = st.s.getDB(dbName);
assert.commandWorked(sDB.adminCommand({enableSharding: dbName}));
if (!TimeseriesTest.shardedtimeseriesCollectionsEnabled(st.shard0)) {
jsTestLog("Skipping test because the sharded time-series collection feature flag is disabled");
st.stop();
return;
}
st.ensurePrimaryShard(dbName, st.shard0.shardName);
// Shard time-series collection.
const shardKey = {
[timeField]: 1
};
assert.commandWorked(sDB.adminCommand({
shardCollection: `${dbName}.${collName}`,
key: shardKey,
timeseries: {timeField, metaField, granularity: "hours"}
}));
// Split the chunks.
const splitPoint = {
[`control.min.${timeField}`]: new Date(50 * 1000)
};
assert.commandWorked(sDB.adminCommand({split: fullBucketsCollName, middle: splitPoint}));
// // Move one of the chunks into the second shard.
const primaryShard = st.getPrimaryShard(dbName);
const otherShard = st.getOther(primaryShard);
assert.commandWorked(sDB.adminCommand(
{movechunk: fullBucketsCollName, find: splitPoint, to: otherShard.name, _waitForDelete: true}));
const coll = sDB.getCollection(collName);
const bucketsColl = sDB.getCollection(bucketsCollName);
const hasInternalBoundedSort = (explain) => {
for (const shardName in explain.shards) {
const pipeline = explain.shards[shardName].stages;
if (!pipeline.some((stage) => stage.hasOwnProperty("$_internalBoundedSort"))) {
return false;
}
}
return true;
};
const assertAccessPath = (pipeline, hint, accessPath, direction) => {
const options = (hint) ? {hint: hint} : {};
const explain = coll.explain().aggregate(pipeline, options);
assert(hasInternalBoundedSort(explain));
const paths = getAggPlanStages(explain, accessPath);
for (const path of paths) {
assert.eq(path.stage, accessPath);
assert.eq(path.direction, direction > 0 ? "forward" : "backward");
}
};
const assertNoRewrite = (pipeline) => {
const explain = coll.explain().aggregate(pipeline);
assert(!hasInternalBoundedSort(explain));
};
for (let i = 0; i < 100; i++) {
assert.commandWorked(
sDB.getCollection(collName).insert({t: new Date(i * 1000), m: i % 4, k: i}));
}
// Ensure that each shard owns one chunk.
const counts = st.chunkCounts(bucketsCollName, dbName);
assert.eq(1, counts[primaryShard.shardName], counts);
assert.eq(1, counts[otherShard.shardName], counts);
assert.eq(coll.count(), 100);
assert.eq(bucketsColl.count(), 4);
// When enabled, the {meta: 1, time: 1} index gets built by default on the time-series bucket
// collection.
const numExtraIndexes = TimeseriesTest.timeseriesScalabilityImprovementsEnabled(st.shard0) ? 1 : 0;
assert.eq(coll.getIndexes().length, 1 + numExtraIndexes);
assert.eq(coll.getIndexes()[numExtraIndexes].name, "control.min.t_1");
const forwardSort = {
$sort: {t: 1}
};
const backwardSort = {
$sort: {t: -1}
};
// One match before the split, one after the split.
for (const matchDate of [new Date(25 * 1000), new Date(75 * 1000)]) {
const match = {$match: {t: matchDate}};
assertAccessPath([match, forwardSort], null, "IXSCAN", 1);
assertAccessPath([match, backwardSort], null, "IXSCAN", -1);
assertNoRewrite([match, {$sort: {t: -1, m: 1}}]);
assertNoRewrite([match, {$sort: {t: 1, m: 1}}]);
}
const kMatch = {
$match: {k: 1}
};
assertAccessPath([forwardSort], null, "COLLSCAN", 1);
assertAccessPath([backwardSort], null, "COLLSCAN", -1);
assertAccessPath([kMatch, forwardSort], null, "COLLSCAN", 1);
assertAccessPath([kMatch, backwardSort], null, "COLLSCAN", -1);
assertAccessPath([forwardSort], {$natural: -1}, "COLLSCAN", 1);
assertAccessPath([backwardSort], {$natural: 1}, "COLLSCAN", -1);
st.stop();
})();
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