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Posted to user@impala.apache.org by "445484859@qq.com" <44...@qq.com> on 2016/07/20 08:51:02 UTC

why does impala have a bad performance on disk write?

Hello, all
    When I use Impala to run a SQL query like 'INSERT INTO/OVERWRITE',  it would be too slow. 
    It seems like that only one thread will do disk write. If so, What for the design? 



Jerry
445484859@qq.com

Re: why does impala have a bad performance on disk write?

Posted by Tim Armstrong <ta...@cloudera.com>.

Hi Jerry,
  You are right that we only use one thread per impalad. We're working on
full multithreading of plans, which should address that bottleneck
(although that work is still a little while away).

- Tim

On Wed, Jul 20, 2016 at 1:51 AM, 445484859@qq.com <44...@qq.com> wrote:

>
> Hello, all
>     When I use Impala to run a SQL query like 'INSERT INTO/OVERWRITE',
>  it would be too slow.
>     It seems like that only one thread will do disk write. If so, What
> for the design?
>
> ------------------------------
> Jerry
> 445484859@qq.com
>
>