JackyYangPassion commented on issue #7594: [for master] general exactly count distinct support in Druid URL: https://github.com/apache/incubator-druid/pull/7594#issuecomment-528267529 Have solve this : the reason is Map memory is too small <property> <name>mapreduce.map.memory.mb</name> <value>20096</value> </property> <property> <name>mapreduce.reduce.memory.mb</name> <value>9096</value> </property>
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