if I run
hadoop jar myjar.jar

and myjar.jar contains some hadoop classes,
where would these hadoop classes be loaded from ? the system hadoop
installation or from myjar.jar ?
Thanks
Yang

Depends on how your Hadoop configuration is set up. By default, the
ones in hadoop installation override.
IIRC this is controlled by mapreduce.task.classpath.user.precedence parameter

D

On Mon, Jun 25, 2012 at 2:18 PM, Yang <[EMAIL PROTECTED]> wrote:
> if I run
> hadoop jar myjar.jar
>
> and myjar.jar contains some hadoop classes,
> where would these hadoop classes be loaded from ? the system hadoop
> installation or from myjar.jar ?
>
>
> Thanks
> Yang

This is a question more appropriate for the hadoop mailing list.

But if you set HADOOP_USER_CLASSPATH_FIRST=true, it think it might help.
You can check with the hadoop shell script. (less `which hadoop`).

THanks,
Thejas
On 6/25/12 2:18 PM, Yang wrote:
> if I run
> hadoop jar myjar.jar
>
> and myjar.jar contains some hadoop classes,
> where would these hadoop classes be loaded from ? the system hadoop
> installation or from myjar.jar ?
>
>
> Thanks
> Yang
>