Hi,

could someone help me with a question to better understand how Hive
interacts with Hadoop?
I understood that for each Map/Reduce-Job Hive wants to get done, it
creates one instance of "Task", which can either be a MapRedTask or an
ExecDriver. On what does it depend which of the two it is?

Thanks,
Jan

When mapred.job.tracker is set to local (default value) or
hive.exec.submitviachild is set to true, MapRedTask instance is used.
Otherwise ExecDriver instance is used.

Please refer to
trunk\ql\src\java\org\apache\hadoop\hive\ql\exec\TaskFactory.java

On Tue, Mar 30, 2010 at 2:16 AM, Jan Stöcker <[EMAIL PROTECTED]> wrote:

> Hi,
>
> could someone help me with a question to better understand how Hive
> interacts with Hadoop?
> I understood that for each Map/Reduce-Job Hive wants to get done, it
> creates one instance of "Task", which can either be a MapRedTask or an
> ExecDriver. On what does it depend which of the two it is?
>
> Thanks,
> Jan
>
>