[GitHub] jacktomcat opened a new issue #6099: Inconsistencies in the result of the quantile aggregator

[GitBox]

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 
   

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org


With regards,
Apache Git Services

---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscr...@druid.apache.org
For additional commands, e-mail: commits-h...@druid.apache.org