JackyYangPassion edited a comment on issue #7594: [for master] general exactly count distinct support in Druid URL: https://github.com/apache/incubator-druid/pull/7594#issuecomment-528175759 i make a test for this PR: **source** data 300 million ; **dictionary** build time 45 min ; dictionary size 7GB; dictionary info:Total 191707672 values and 48 slices,min:0,max:191707672 **there is one problem: when build segment long time can't build finish; some Map hang up many hours** there is the Map log: `2019-09-05T09:32:00,414 INFO [main] org.apache.parquet.hadoop.InternalParquetRecordReader - at row 0. reading next block 2019-09-05T09:32:00,975 INFO [main] org.apache.parquet.hadoop.InternalParquetRecordReader - block read in memory in 561 ms. row count = 732366 2019-09-05T09:39:10,079 INFO [main] org.apache.kylin.dict.AppendTrieDictionary - Evict slice with key APArDCycNA1LBbSBJN114twCcdStEcZQtVU= and value null caused by COLLECTED, size 30/48 2019-09-05T09:39:10,079 INFO [main] org.apache.kylin.dict.AppendTrieDictionary - Evict slice with key ALDreChzKg1LBUt0Rr_TW-HAbTiuSotei-I= and value null caused by COLLECTED, size 30/48 2019-09-05T09:39:10,080 INFO [main] org.apache.kylin.dict.AppendTrieDictionary - Evict slice with key ACDvscHggA1LBdZmGFsn8cWVhiIyEjszhu0= and value null caused by COLLECTED, size 30/48 2019-09-05T09:39:10,080 INFO [main] org.apache.kylin.dict.AppendTrieDictionary - Evict slice with key and value null caused by COLLECTED, size 30/48 2019-09-05T09:39:10,080 INFO [main] org.apache.kylin.dict.AppendTrieDictionary - Evict slice with key AMBh5j9swQ9LBfOZxCJ6vLZh1ms8RIDZmW4= and value null caused by COLLECTED, size 30/48` the build segment MR memory config: `<property> <name>mapreduce.map.memory.mb</name> <value>10096</value> </property> <property> <name>mapreduce.reduce.memory.mb</name> <value>9096</value> </property>`
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