hive-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Xuefu Zhang <xzh...@cloudera.com>
Subject Re: Bucket map join - reducers role
Date Fri, 27 Feb 2015 18:44:45 GMT
Could you post your query and  "explain your_query" result?

On Fri, Feb 27, 2015 at 5:32 AM, murali parimi <
muralikrishna.parimi@icloud.com> wrote:

> Hello team,
>
> I have two tables A and B. A has 360Million rows with one column K. B has
> around two billion rows with multiple columns including K.
>
> Both tables are clustered and sorted by K and Bucketed into same number of
> buckets.
>
> When I perform a join, I assumed there won't be any reducers spawned as
> the join would happen on map side. Still user fee reducers getting spawned.
>
> Any role for reducers here? Am I missing something?
>
> Sent from my iPhone

Mime
View raw message