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Pig, mail # user - What is the best way to do counting in pig?


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Re: What is the best way to do counting in pig?
Jonathan Coveney 2012-07-02, 20:20
Is your goal to have the 10 largest rows by member_id?

2012/7/2 Sheng Guo <[EMAIL PROTECTED]>

> Hi all,
>
> I used to use the following pig script to do the counting of the records.
>
> m_skill_group = group m_skills_filter by member_id;
> grpd = group m_skill_group all;
> cnt = foreach grpd generate COUNT(m_skill_group);
>
> cnt_filter = limit cnt 10;
> dump cnt_filter;
>
>
> but sometimes, when the records get larger, it takes lots of time and hang
> up, and or die.
> I thought counting should be simple enough, so what is the best way to do a
> counting in pig?
>
> Thanks!
>
> Sheng
>