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/**
* Evaluate the behaviour of bucket closure when we simulate high cache pressure due to a high
* cardinality workload. After we hit a certain cardinality (the number of active buckets generated
* in this test by distinct metaField values) we expect buckets to be closed with a smaller bucket
* size limit to alleviate pressure on the cache with respect to large measurement insertions.
*
* @tags: [
* # Exclude in-memory engine, rollbacks due to pinned cache content rely on eviction.
* requires_persistence,
* requires_replication,
* requires_wiredtiger,
* ]
*/
(function() {
"use strict";
load("jstests/core/timeseries/libs/timeseries.js");
const defaultBucketMaxSize = 128000; // 125 KB
const minWiredTigerCacheSizeGB = 0.256; // 256 MB
const minWiredTigerCacheSize = minWiredTigerCacheSizeGB * 1024 * 1024 * 1024; // 256 MB
const measurementValueLength = 1 * 1024 * 1024; // 1 MB
const defaultBucketMinCount = 10;
const timeFieldName = 'time';
const metaFieldName = 'meta';
const replSet = new ReplSetTest({
nodes: 1,
nodeOptions: {wiredTigerCacheSizeGB: minWiredTigerCacheSizeGB},
});
replSet.startSet({setParameter: {timeseriesBucketMaxSize: defaultBucketMaxSize}});
replSet.initiate();
const db = replSet.getPrimary().getDB(jsTestName());
let coll = db.getCollection('t');
coll.drop();
if (!TimeseriesTest.timeseriesScalabilityImprovementsEnabled(db)) {
replSet.stopSet();
jsTestLog(
'Skipping test because the TimeseriesScalabilityImprovements feature flag is disabled.');
return;
}
// Helper to log timeseries stats.
const formatStatsLog = ((stats) => {
return "Timeseries stats: " + tojson(stats);
});
const resetCollection = (() => {
coll.drop();
assert.commandWorked(db.createCollection(
coll.getName(), {timeseries: {timeField: timeFieldName, metaField: metaFieldName}}));
});
// Inserts small documents into the collection with increasing meta fields to generate N buckets.
const initializeBuckets = function(numOfBuckets = 1) {
jsTestLog("Inserting and generating buckets.");
let bulk = coll.initializeUnorderedBulkOp();
for (let i = 0; i < numOfBuckets; i++) {
const doc = {_id: i, [timeFieldName]: ISODate(), [metaFieldName]: i, value: "a"};
bulk.insert(doc);
}
assert.commandWorked(bulk.execute());
};
(function largeMeasurementsNoCachePressure() {
jsTestLog("Entering largeMeasurementsNoCachePressure...");
coll = db.getCollection('largeMeasurementsNoCachePressure');
resetCollection();
let expectedBucketCount = 0;
let numBucketsClosedDueToSize = 0;
let numBucketsClosedDueToCachePressure = 0;
let numCompressedBuckets = 0;
const meta1 = 1;
const meta2 = 2;
// Insert 9 large measurements into same bucket (mapping to meta1) resulting in a bucket of size
// ~11.5 MB (right under the largest size of buckets we allow which is 12 MB).
for (let i = 0; i < defaultBucketMinCount - 1; i++) {
const doc = {
_id: i,
[timeFieldName]: ISODate(),
[metaFieldName]: meta1,
value: "a".repeat(measurementValueLength)
};
assert.commandWorked(coll.insert(doc));
}
expectedBucketCount++;
let timeseriesStats = assert.commandWorked(coll.stats()).timeseries;
assert.eq(timeseriesStats.bucketCount, expectedBucketCount, formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToSize,
numBucketsClosedDueToSize,
formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToCachePressure,
numBucketsClosedDueToCachePressure,
formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numCompressedBuckets,
numCompressedBuckets,
formatStatsLog(timeseriesStats));
// If we exceed the min bucket count of 10, we should close the bucket since it exceeds our
// default bucket size of 125 KB. (This requires two additional insertions).
const doc = {_id: 4, [timeFieldName]: ISODate(), [metaFieldName]: meta1, value: "a"};
assert.commandWorked(coll.insert(doc));
assert.commandWorked(coll.insert(doc));
expectedBucketCount++;
numBucketsClosedDueToSize++;
numCompressedBuckets++;
timeseriesStats = assert.commandWorked(coll.stats()).timeseries;
assert.eq(timeseriesStats.bucketCount, expectedBucketCount, formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToSize,
numBucketsClosedDueToSize,
formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToCachePressure,
numBucketsClosedDueToCachePressure,
formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numCompressedBuckets,
numCompressedBuckets,
formatStatsLog(timeseriesStats));
// Since the maximum size for buckets is capped at 12 MB, we should hit the size limit before
// closing the bucket due to the minimum count, so we expect to close the oversized bucket and
// create another bucket.
for (let i = 0; i < defaultBucketMinCount; i++) {
const doc = {
_id: i,
[timeFieldName]: ISODate(),
[metaFieldName]: meta2,
value: "b".repeat(measurementValueLength)
};
assert.commandWorked(coll.insert(doc));
}
// We create one bucket for 'meta2', fill it up and create another one for future insertions.
expectedBucketCount += 2;
numBucketsClosedDueToSize++;
numCompressedBuckets++;
timeseriesStats = assert.commandWorked(coll.stats()).timeseries;
assert.eq(timeseriesStats.bucketCount, expectedBucketCount, formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToSize,
numBucketsClosedDueToSize,
formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToCachePressure,
numBucketsClosedDueToCachePressure,
formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numCompressedBuckets,
numCompressedBuckets,
formatStatsLog(timeseriesStats));
})();
(function largeMeasurementsWithCachePressure() {
jsTestLog("Entering largeMeasurementsWithCachePressure...");
coll = db.getCollection('largeMeasurementsWithCachePressure');
resetCollection();
// We want the 'cacheDerivedMaxSize' to equal 5.5 MB.
const cacheDerivedMaxSize = 5.5 * 1024 * 1024;
const bucketCount =
Math.ceil(minWiredTigerCacheSize / (2 * cacheDerivedMaxSize)); // Evaluates to 24.
const meta = bucketCount;
// We expect the bucket mapping to 'meta' to be around ~5 MB in size so no buckets should be
// closed yet. We generate a cardinality equal to 'bucketCount'.
initializeBuckets(bucketCount - 1);
for (let i = 0; i < 3; i++) {
const doc = {
_id: i,
[timeFieldName]: ISODate(),
[metaFieldName]: meta,
value: "a".repeat(measurementValueLength)
};
assert.commandWorked(coll.insert(doc));
}
let timeseriesStats = assert.commandWorked(coll.stats()).timeseries;
assert.eq(timeseriesStats.bucketCount, bucketCount, formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToSize, 0, formatStatsLog(timeseriesStats));
assert.eq(
timeseriesStats.numBucketsClosedDueToCachePressure, 0, formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numCompressedBuckets, 0, formatStatsLog(timeseriesStats));
// We expect this insert to cause the bucket to close due to cache pressure since it will exceed
// the rough cacheDerivedMaxSize of 5.5 MB and create a new bucket for this measurement.
const doc = {
_id: bucketCount,
[timeFieldName]: ISODate(),
[metaFieldName]: meta,
value: "a".repeat(measurementValueLength)
};
assert.commandWorked(coll.insert(doc));
timeseriesStats = assert.commandWorked(coll.stats()).timeseries;
assert.eq(timeseriesStats.bucketCount, bucketCount + 1, formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numBucketsClosedDueToSize, 0, formatStatsLog(timeseriesStats));
assert.eq(
timeseriesStats.numBucketsClosedDueToCachePressure, 1, formatStatsLog(timeseriesStats));
assert.eq(timeseriesStats.numCompressedBuckets, 1, formatStatsLog(timeseriesStats));
})();
replSet.stopSet();
})();
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