kylin-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From liuzhixin <liuz...@163.com>
Subject Re: Redistribute intermediate table default not by rand()
Date Fri, 02 Nov 2018 04:53:32 GMT
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 <liuzx32@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.
> 


Mime
View raw message