Re: [DISCUSSION] Don't need to purge existing segment of cube to add new measures in Kylin

2019-04-26 Thread yuzhang
Thanks for your replies. Here is the jira about this feature. The PR are being prepared. Hoping for more advices from yours. https://issues.apache.org/jira/browse/KYLIN-3982 Regards yuzhang | | yuzhang | | shifengdefan...@163.com | 签名由网易邮箱大师定制 On 4/26/2019 17:05,Iñigo Martínez wrote: +1

Re: [DISCUSSION] Don't need to purge existing segment of cube to add new measures in Kylin

2019-04-26 Thread ShaoFeng Shi
Hi Yuzhang, Please open a JIRA for this enhancement; If it can be implemented in an elegant way, that will be great! Best regards, Shaofeng Shi 史少锋 Apache Kylin PMC Email: shaofeng...@apache.org Apache Kylin FAQ: https://kylin.apache.org/docs/gettingstarted/faq.html Join Kylin user mail group:

Re: [DISCUSSION] Don't need to purge existing segment of cube to add new measures in Kylin

2019-04-22 Thread yuzhang
Hi Shaofeng: We also take some experiment for add measure after cube be built and encountered byte error at the very start. The default mapping strategy between HBase store and measure definition is "multiple measures are stored in one column of column family", which may cause byte error

Re: [DISCUSSION] Don't need to purge existing segment of cube to add new measures in Kylin

2019-04-21 Thread ShaoFeng Shi
Hi Yuzhang, Glad to see such a discussion; How to support "schema change" in a friendly way is what we should do in the next phase, as we see this requirement is stronger than before. Last week I also did a try on 1) adding a dimension after cube be built, and 2) adding a measure after cube be

Re: [DISCUSSION] Don't need to purge existing segment of cube to add new measures in Kylin

2019-04-21 Thread yuzhang
Hi JiaTao: Maybe it's necessary that there is an optional auto-complete machanism among different measure's view, isn't it? yuzhang | | yuzhang | | shifengdefan...@163.com | 签名由网易邮箱大师定制 On 4/20/2019 11:38,JiaTao Tao wrote: Hi The idea that supports Kylin adding measures dynamically is

Re: [DISCUSSION] Don't need to purge existing segment of cube to add new measures in Kylin

2019-04-19 Thread JiaTao Tao
Hi The idea that supports Kylin adding measures dynamically is impressive. But in my opinion, once you add a measure, the existing segments should also calculate the new measure(just add a new measure column). Users can have many cubes, a cube can have many segments, if measure's view is

[DISCUSSION] Don't need to purge existing segment of cube to add new measures in Kylin

2019-04-19 Thread yuzhang
Hi dear kylin users and develop team: Here have some things I want to discuss with community. As a representative of MOLAP engine, kylin uses pre-aggregation strategies to provide high-concurrency and second-level response analysis capabilities, but also loses some flexibility. The limitation