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

Switch to Plain View
MapReduce >> mail # dev >> How to modify the Map-Reduce execution order?

Anh Pham 2013-10-16, 08:16
Tsuyoshi OZAWA 2013-10-16, 09:08
Copy link to this message
Re: How to modify the Map-Reduce execution order?
You might be interested in Apache Tez which provides native support for these sort of scenarios by being a super-set of MapReduce:



On Oct 16, 2013, at 1:16 AM, Anh Pham <[EMAIL PROTECTED]> wrote:

> (Please correct me if I am wrong) So the original chain is:
> InputSplits-->Mapper--> [Sorting/Shuffling, etc]-->Reducer-->...
> Now I don't want the input splits to get to the Mappers first, but to go to
> some other new stage instead (we can call it Pre-Mapper for example, this
> class will be created by myself).
> So the new order will be: InputSplits -> Pre-Mapper->Mapper ->...
> I'm currently reading the source code. However, I still cannot find any
> clue (what classes I should touch). Any suggestion is welcome. Thank you
> very much :)

Arun C. Murthy
Hortonworks Inc.

NOTICE: This message is intended for the use of the individual or entity to
which it is addressed and may contain information that is confidential,
privileged and exempt from disclosure under applicable law. If the reader
of this message is not the intended recipient, you are hereby notified that
any printing, copying, dissemination, distribution, disclosure or
forwarding of this communication is strictly prohibited. If you have
received this communication in error, please contact the sender immediately
and delete it from your system. Thank You.