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From Li Yang <liy...@apache.org>
Subject Re: [Discuss] Disable/hide "RAW" measure in Kylin web GUI
Date Fri, 01 Dec 2017 06:02:57 GMT
+1 for complete removal.

On Wed, Nov 29, 2017 at 1:45 PM, ShaoFeng Shi <shaofengshi@apache.org>
wrote:

> Billy, I don't see a need for "advanced user could enable it also." Do
> you have such a case?
>
> For the legacy cube, it can continue to build, the backend code won't be
> removed during this phase.
>
>
> 2017-11-28 22:58 GMT+08:00 Billy Liu <billyliu@apache.org>:
>
>> +1 to turn this feature off by default. The advanced user could enable it
>> also.
>>
>> 2017-11-27 13:53 GMT+08:00 Luke Han <luke.hq@gmail.com>:
>>
>>> +1 to remove it from new release, people could backport to new version
>>> with previous code
>>>
>>>
>>> Best Regards!
>>> ---------------------
>>>
>>> Luke Han
>>>
>>> On Sun, Nov 26, 2017 at 9:40 PM, ShaoFeng Shi <shaofengshi@apache.org>
>>> wrote:
>>>
>>>> Last year I raised this discussion but didn't have follow-up action.
>>>>
>>>> Now we see there are still some new users misuse this feature, and then
>>>> face performance and maintenance issues.
>>>>
>>>> In Kylin 2.1, the new "query pushdown" feature can forward the Cube
>>>> unmatched queries to alternative query engines like Hive / SparkSQL. The
>>>> raw data query is just such a scenario.
>>>>
>>>> So I think it is time to disable the RAW measure on Kylin now.  JIRA
>>>> created for it: https://issues.apache.org/jira/browse/KYLIN-3062
>>>>
>>>> Please comment if you see any issue.
>>>>
>>>> 2016-12-19 22:03 GMT+08:00 Billy Liu <billyliu@apache.org>:
>>>>
>>>> > The experimental mode is system wide feature toggle. I think case by
>>>> case
>>>> > is more flexible. Most new features could have toggles, default are
>>>> off.
>>>> >
>>>> > 2016-12-19 21:40 GMT+08:00 Luke Han <luke.hq@gmail.com>:
>>>> >
>>>> > > Beta or Experimental will also bring confusing for most of users.
>>>> > >
>>>> > > Maybe we could have something called "expert" or "experimental"
>>>> model in
>>>> > > system configuration.
>>>> > >
>>>> > > User will not see such content since they will be hidden by default
>>>> but
>>>> > > admin could set it to true if they confident to enable such
>>>> features.
>>>> > >
>>>> > > How do you think?
>>>> > >
>>>> > >
>>>> > > Best Regards!
>>>> > > ---------------------
>>>> > >
>>>> > > Luke Han
>>>> > >
>>>> > > On Mon, Dec 19, 2016 at 11:24 AM, Xiaoyu Wang <wangxy.jd@gmail.com>
>>>> > wrote:
>>>> > >
>>>> > > > I’m sorry for too long not maintain it!
>>>> > > >
>>>> > > > I agree with liyang to give a label to the RAW measure “Beta”
or
>>>> > others.
>>>> > > >
>>>> > > > I will improve it when I have time!
>>>> > > >
>>>> > > > 2016-12-19 10:21 GMT+08:00 Li Yang <liyang@apache.org>:
>>>> > > >
>>>> > > > > Or display the Raw with "Beta" or "Experimental" to warn
user
>>>> that it
>>>> > > is
>>>> > > > > not a mature feature?
>>>> > > > >
>>>> > > > > On Fri, Dec 16, 2016 at 12:30 PM, 康凯森 <kangkaisen@qq.com>
>>>> wrote:
>>>> > > > >
>>>> > > > > > +1.
>>>> > > > > > But the "RAW" measure is still some useful, we could
improve
>>>> it
>>>> > next
>>>> > > > year
>>>> > > > > > when we have time.
>>>> > > > > >
>>>> > > > > >
>>>> > > > > > ------------------ 原始邮件 ------------------
>>>> > > > > > 发件人: "ShaoFeng Shi";<shaofengshi@apache.org>;
>>>> > > > > > 发送时间: 2016年12月15日(星期四) 中午12:05
>>>> > > > > > 收件人: "dev"<dev@kylin.apache.org>;
>>>> > > > > >
>>>> > > > > > 主题: [Discuss] Disable/hide "RAW" measure in
Kylin web GUI
>>>> > > > > >
>>>> > > > > >
>>>> > > > > >
>>>> > > > > > Hello developers and users,
>>>> > > > > >
>>>> > > > > > I have a proposal want to disucss here, which is
about the
>>>> "RAW"
>>>> > > > measure
>>>> > > > > in
>>>> > > > > > Kylin.
>>>> > > > > >
>>>> > > > > > The RAW measure was developed to solve the requirement
for
>>>> getting
>>>> > > raw
>>>> > > > > data
>>>> > > > > > when user drill down from high level to low levels.
It's
>>>> > performance
>>>> > > > > would
>>>> > > > > > be much better than fetching from source like Hive,
so some
>>>> users
>>>> > > like
>>>> > > > > it.
>>>> > > > > > This blog introduces it:
>>>> > > > > > https://kylin.apache.org/blog/2016/05/29/raw-measure-in-kyli
>>>> n/
>>>> > > > > >
>>>> > > > > > While it has some limitations:
>>>> > > > > > 1) always use dictionary encoding, which means it
couldn't
>>>> support
>>>> > > UHC;
>>>> > > > > > since raw columns usually be transaction IDs, numbers,
etc,
>>>> the
>>>> > > > building
>>>> > > > > > cost is much higher than ordinary dimensions;
>>>> > > > > > 2) the raw messages for a dimension combination
are persisted
>>>> in
>>>> > one
>>>> > > > big
>>>> > > > > > cell,; When too many rows dumped in one cell, will
get
>>>> > BufferOverflow
>>>> > > > > > error. This couldn't be predicted, so for an modeler
or
>>>> analyst he
>>>> > > > > doesn't
>>>> > > > > > know whether this feature could work when he creates
the cube.
>>>> > > > > > 3) seems no people maintains it;
>>>> > > > > >
>>>> > > > > > Based on above, I propose hiding this measure on
Web GUI by
>>>> > default,
>>>> > > so
>>>> > > > > > avoiding confusing user; If someone hear and want
to use
>>>> this, he
>>>> > > still
>>>> > > > > can
>>>> > > > > > enable it by simply set in kylin.properties.
>>>> > > > > >
>>>> > > > > > Any input is welcomed.
>>>> > > > > >
>>>> > > > > > --
>>>> > > > > > Best regards,
>>>> > > > > >
>>>> > > > > > Shaofeng Shi 史少锋
>>>> > > > > >
>>>> > > > >
>>>> > > >
>>>> > >
>>>> >
>>>>
>>>>
>>>>
>>>> --
>>>> Best regards,
>>>>
>>>> Shaofeng Shi 史少锋
>>>>
>>>
>>>
>>
>
>
> --
> Best regards,
>
> Shaofeng Shi 史少锋
>
>

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