Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Plain View
Hive >> mail # user >> what impact for  changing the property "hive.exec.parallel=true"?


+
Matouk Iftissen 2012-09-10, 15:26
Copy link to this message
-
Re: what impact for changing the property "hive.exec.parallel=true"?
Hive converts multi-step map reduce job into stages. Some of these stages
are dependent on each other some are not. If you set
hive.exec.parallel=true and hive determines that some stages of the job do
not depend on each other it may run more then one at once (currently it
only runs one at a time).

So the result is hive can use more cluster resources to satisfy complex
queries in some cases.

Edward

On Mon, Sep 10, 2012 at 11:26 AM, Matouk Iftissen <[EMAIL PROTECTED]>wrote:

>  Hello every one,
>
> Can anyone tell me what impact can affect jobs (or queries) if we turn on
> (make to true ) the  propriety hive.exec.parallel (by default it is set
> to  false)?
>
> Thanks for your answers.
>
>
>
> Matouk Iftissen
>
> [EMAIL PROTECTED]
>
> [image: Description :
> file:///D:/Documents%20and%20Settings/rco/Bureau/logo%20cyres/signature/Logo%20CYRES%20GROUPE.jpg]
>
>  19-21, rue Edouard Vaillant
>
>  37000 TOURS
>
>  *Tèl. 02 47 68 48 50 *
>
>  Fax 02 47 68 48 59
>
>  www.cyres.fr
>
>
>