how to spawn a new process for a map/reduce task

[momina khan <mo...@gmail.com>]

hi all,

can anyone plz explain why they have stopped using the Java class
ProcessBuilder for spawning a process for a map or reduce task in
class TaskRunner in favour of the alternative in hadoop 0.16.0.

just wondering!
regards
momina

Re: how to spawn a new process for a map/reduce task

[Amar Kamat <am...@yahoo-inc.com>]

We have a wrapper around ProcessBuilder for running shell commands called 
Shell (see o.a.h.u.Shell). The reason for this wrapper is better output and 
error handling for shell commands. Almost all the needs are 
addressed by this wrapper and it also provides a common and a consistent 
way to run shell commands whenever needed.
Amar
On Mon, 3 Mar 2008, momina khan 
wrote:

> hi all,
>
> can anyone plz explain why they have stopped using the Java class
> ProcessBuilder for spawning a process for a map or reduce task in
> class TaskRunner in favour of the alternative in hadoop 0.16.0.
>
> just wondering!
> regards
> momina
>