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

Switch to Threaded View
Hive >> mail # user >> Interpreting explain plan in hive


Copy link to this message
-
Re: Interpreting explain plan in hive
The only bad plan would be a plan that ends up producing the wrong result,
or throwing an exception. generally I look to see if there is a way to have
less map/reduce stages, the best plan is usually the one that does the job
in a single map reduce, or even better a single map only job.
On Fri, Aug 23, 2013 at 1:28 AM, pandees waran <[EMAIL PROTECTED]> wrote:

> Hi,
>
> What are the key areas we need to check in the explain plan generated in
> Hive?
> I have checked the documentation, it's not detailed about the above
> question.
> https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Explain
> I have similar kind of question asked in our forum, which is unanswered.
>
> http://mail-archives.apache.org/mod_mbox/hive-user/201107.mbox/%3CCAAG3+[EMAIL PROTECTED]%3E
>
> In summary, how we can distinguish a good/bad plan ?
>
> Thanks for your help.
> --
> Thanks,
> Pandeeswaran
>