jacktomcat opened a new issue #6099: Inconsistencies in the result of the quantile aggregator URL: https://github.com/apache/incubator-druid/issues/6099 I use the quantile aggregator, but many times the query results are inconsistent. The version of Druid is 0.12.1 Here's my script { "queryType": "groupBy", "dataSource": { "type": "table", "name": "SVR_ACTION_DATA" }, "intervals": { "type": "LegacySegmentSpec", "intervals": [ "2018-04-30T00:00:00.000Z/2018-05-31T00:00:00.000Z" ] }, "virtualColumns": [], "filter": { "type": "and", "fields": [ { "type": "selector", "dimension": "biz_system_id", "value": "1", "extractionFn": null }, { "type": "selector", "dimension": "data_type", "value": "APP", "extractionFn": null } ] }, "granularity": "ALL", "dimensions": [], "context" : { "skipEmptyBuckets": "true" }, "aggregations": [ { "type": "longSum", "name": "respTime", "fieldName": "resp_time", "expression": null }, { "type": "longSum", "name": "successCount", "fieldName": "success_count", "expression": null }, { "type": "approxHistogramFold", "name": "resp_time_his", "fieldName": "resp_time_his", "resolution": 600, "numBuckets": 7, "lowerLimit": "-Infinity", "upperLimit": "Infinity" } ], "postAggregations": [ { "type": "arithmetic", "name": "response", "fn": "/", "fields": [ { "type": "fieldAccess", "name": "0-fieldaccess", "fieldName": "respTime" }, { "type": "fieldAccess", "name": "1-fieldaccess", "fieldName": "successCount" } ], "ordering": null }, { "type": "quantiles", "name": "respTimeHis", "fieldName": "resp_time_his", "probabilities": [ 0.5,0.6,0.7,0.8 ] } ], "having": null, "limitSpec": { "type": "default", "columns": [], "limit": 2147483647 }, "descending": false } The following is the result of my running： [ { "version": "v1", "timestamp": "2018-04-30T00:00:00.000Z", "event": { "successCount": 1364670887, "resp_time_his": { "breaks": [ -124.83333587646484, 0, 124.83333587646484, 249.6666717529297, 374.5, 499.3333435058594, 624.1666870117188, 749 ], "counts": [ 0, 5772020, 5751136, 5755229, 5747462.5, 5748575, 5775551 ] }, "response": 9.481008641169906, "respTime": 12938456472, "respTimeHis": { "probabilities": [ 0.5, 0.6, 0.7, 0.8 ], "quantiles": [ 373.30453, 448.30597, 523.41125, 598.38446 ], "min": 0, "max": 749 } } } ] But ```quantiles``` array values have errors，examples: > quantiles: [373.30453, 448.30597, 523.41125, 598.38446 ] > quantiles: [373.64453, 449.40597, 509.42345, 573.23112 ] > ..... What is the cause of this ？ @fjy @gianm @xvrl @nishantmonu51 @drcrallen
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