Re: Re: [DISCUSS] Set SegmentV2 as the default format of Doris Storage

[Zhao Chun]

Hi, Yunfeng


Yunfeng Wu <wyfsky...@126.com> 于2020年8月18日周二 下午8:11写道：

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> Can we provide some performance performance comparision between v1 and v2.

I was worried about  the perfomance would slow down when do some string
> field aggs opertion because of the `look up` of the `dict ordinary`
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> Actually, in theory, segment v2 is more efficient for reading strings than
v1. Because it stores encoded numbers, lighter IO operations are required
when reading. As for the Look-up operation you mentioned, it is an
operation of O1 in the memory, and the time cost is negligible.

I will appreciate if you can provide some performance comparison test
reports.

Thanks,
Zhao Chun


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> --
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> ------------------------------------------
> 武云峰
> email:wyfsky...@126.com
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> 在 2020-08-18 17:22:22，"Zhao Chun" <zh...@apache.org> 写道：
> >+1
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> >Thanks,
> >Zhao Chun
> >
> >
> >41108453 <41108...@qq.com> 于2020年8月18日周二 下午12:24写道：
> >
> >> Yes, it should be like this, saving you having to configure each time
> >>
> >>
> >>
> >>
> >> ------------------&nbsp;原始邮件&nbsp;------------------
> >> 发件人:
> >>                                                   "dev"
> >>                                                                 <
> >> morning...@163.com&gt;;
> >> 发送时间:&nbsp;2020年8月18日(星期二) 中午12:14
> >> 收件人:&nbsp;"doris-dev"<dev@doris.apache.org&gt;;
> >>
> >> 主题:&nbsp;[DISCUSS] Set SegmentV2 as the default format of Doris Storage
> >>
> >>
> >>
> >> Hi All:
> >>
> >>
> >> I suggest that in version 0.13, SegmentV2 is set as the default storage
> >> format.
> >> All newly created tables are in V2 format.
> >>
> >>
> >> The table created by the user before still retains the original format,
> >> and the user can choose to convert it by himself.
> >>
> >>
> >>
> >> --
> >>
> >> 此致！Best Regards
> >> 陈明雨 Mingyu Chen
> >>
> >> Email:
> >> chenmin...@apache.org
>