The examples in ch8 and ch9 use chain mapping,
I will pick this conversation in the www.prohadoop.com forum
On Fri, Jul 17, 2009 at 9:34 AM, Rakhi Khatwani wrote:
> Hi Jason,
> I have the book with me and reading that book i got a fair
> idea about chaining maps/reduce. but i wanted
Hi Jason,
I have the book with me and reading that book i got a fair
idea about chaining maps/reduce. but i wanted to try out a simple example to
get my concepts clear. i coudn't find any example which depicts the use of
chainMapper/chainReducer. so i downloaded prohadoop.jar. but tha
There are some examples for chain mapping in the example bundle for chapter
8 of Pro Hadoop.
One think that may not be clear is that the chain of mappers execute within
the single task jvm assigned for each map task,
and the mappers chained to the reduce execute in the jvm assigned to the
reduce.
S
Hi
I am trying out a simple example in which you have two maps and one
reduce, Map1 and Map2 and Reduce1
now i wanna execute my job in the following fashion
Map1 -> Map2 -> Reduce1 (o/p of map1 goes into map2 and o/p of map2 goes
into reduce1)
i have declared my conf as follows:
JobCo
