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Posted to dev@kylin.apache.org by yuzhang <sh...@163.com> on 2019/02/21 12:19:19 UTC
I wonder about the qualifier assignment within an column family for
measures
Hi, dear team, when I read the source code about create HTable and CubeDescCreator, I found there is only one column("M") per column family(F1, F2, F3). And the column "M" contain all measures which are assigned to this column family. Then, HBaseReadonlyStore will load all this column(or Cell) data into buffer in region server, and then only return the selected measure to query server. I wonder why don't kyiln assign an column qualifer(like M1, M2) per measures?
and if my understanding of these codes is incorrect, could you let me know, Please.
Hope for any of yours reply.
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shifengdefannao
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Email:shifengdefannao@163.com
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Signature is customized by Netease Mail Master
Re: I wonder about the qualifier assignment within an column family
for measures
Posted by ShaoFeng Shi <sh...@apache.org>.
Hi Zhang Yu,
Kylin's metadata structure allows dividing the measures to one or multiple
CF/columns. To be simple, the web GUI only asks the user to select CF, and
then combine all the measures in a CF into one column. You can customize
the policy to further divides the measures into different columns if you
think that is better. Please share us with your findings, if it does
benefit the performance.
Thank you!
Best regards,
Shaofeng Shi 史少锋
Apache Kylin PMC
Work email: shaofeng.shi@kyligence.io
Kyligence Inc: https://kyligence.io/
Apache Kylin FAQ: https://kylin.apache.org/docs/gettingstarted/faq.html
Join Kylin user mail group: user-subscribe@kylin.apache.org
Join Kylin dev mail group: dev-subscribe@kylin.apache.org
yuzhang <sh...@163.com> 于2019年2月21日周四 下午8:19写道：
> Hi, dear team, when I read the source code about create HTable and
> CubeDescCreator, I found there is only one column("M") per column
> family(F1, F2, F3). And the column "M" contain all measures which are
> assigned to this column family. Then, HBaseReadonlyStore will load all
> this column(or Cell) data into buffer in region server, and then only
> return the selected measure to query server. I wonder why don't kyiln
> assign an column qualifer(like M1, M2) per measures?
>
> and if my understanding of these codes is incorrect, could you let me
> know, Please.
> Hope for any of yours reply.
>
> | |
> shifengdefannao
> |
> |
> Email:shifengdefannao@163.com
> |
>
> Signature is customized by Netease Mail Master