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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2018/08/03 04:55:07 UTC
[GitHub] jacktomcat opened a new issue #6099: Inconsistencies in the result
of the quantile aggregator
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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