Hi ShaoFeng Shi OK, thank you for the answer. # Perhaps Kylin should provide the tips or notes for the default shard.
Best Wishes. > 在 2018年11月2日，下午1:42，ShaoFeng Shi <shaofeng...@apache.org> 写道： > > Please move the high cardinality dimensions to the leading position of > rowkey, that will make the data distribution more even; > > Chao Long <wayn...@qq.com> 于2018年11月2日周五 下午1:38写道： > >> Hi zhixin, >> Data may become not correct if use "distribute by rand()". >> https://issues.apache.org/jira/browse/KYLIN-3388 >> >> >> >> >> ------------------ 原始邮件 ------------------ >> 发件人: "liuzhixin"<liuz...@163.com>; >> 发送时间: 2018年11月2日(星期五) 中午12:53 >> 收件人: "dev"<dev@kylin.apache.org>; >> 抄送: "ShaoFeng Shi"<shaofeng...@apache.org>; >> 主题: Re: Redistribute intermediate table default not by rand() >> >> >> >> Hi kylin team: >> >> Step: Redistribute intermediate table >> # >> 默认选择了维度的前三个字段作为DISTRIBUTE BY的依据，没有采用DISTRIBUTE BY RAND() >> 如果没有合适的维度字段，这样的默认策略将会导致数据更加的数据不均衡。 >> >> Best Regards！ >> >>> 在 2018年11月2日，下午12:03，liuzhixin <liuz...@163.com> 写道： >>> >>> Hi kylin team: >>> >>> Version: Kylin2.5-hadoop3.1 for hdp3.0 >>> # >>> Step: Redistribute intermediate table >>> # >>> DISTRIBUTE BY is that: >>> INSERT OVERWRITE TABLE table_intermediate SELECT * FROM >> table_intermediate DISTRIBUTE BY Field1, Field2, Field3; >>> # >>> Not DISTRIBUTE BY RAND() >>> # >>> Is this default DISTRIBUTE BY Field1, Field2, Field3? how to DISTRIBUTE >> BY RAND()? >>> >>> Best wishes. >>> > > > > -- > Best regards, > > Shaofeng Shi 史少锋
