This test case (when added to cbr_persistent_sample.js) will fail because it doesn't find the sample persisted by the analyze command.   { jsTest.log.info( "Testing chunk sampling with small collection (200 docs) forces full collection scan - persistent sample hit" , ); assert .commandWorked(db.adminCommand({setParameter: 1, internalQuerySamplingCEMethod: "chunk" })); const kSmallCollSize = 200; coll.drop(); PersistentSamplesUtils.dropSamplesColl(db); assert .commandWorked( coll.insert(Array.from({length: kSmallCollSize}, (_, i) => ({_id: i, a: i, tag: "small" }))), ); assert .commandWorked( db.runCommand({ analyze: collName, mode: "sample" , samplingMethod: "chunk" , sampleSize: kSampleSize, numChunks: kNumChunks, }), ); // Since the default sample size is greater than 200, we expect to get a full collection scan sample. const expectedDocCount = 200; const meta = getWinningPlanMetadata({a: {$gte: 0}}); assert .eq(meta.sampleSource, "persisted" , "expected persisted sample on hit" , {meta}); assert .eq(meta.sampleTechnique, "chunk" , "expected chunk technique" , {meta}); assert .eq(meta.sampleNumChunks, kNumChunks, "expected numChunks to match" , {meta}); assert .eq(meta.sampleDocCount, expectedDocCount, "expected docCount to match persisted sample size" , {meta}); assert .eq(meta.sampleRequestedDocCount, kSampleSize, "expected requestedDocCount to match" , {meta}); }