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From "Rong-en Fan" <gra...@gmail.com>
Subject Re: [Streaming] How to pass arguments to a map/reduce script
Date Thu, 21 Aug 2008 15:09:41 GMT
On Thu, Aug 21, 2008 at 3:14 PM, Gopal Gandhi
<gopal.gandhi2008@yahoo.com> wrote:
> I am using Hadoop streaming and I need to pass arguments to my map/reduce script. Because
a map/reduce script is triggered by hadoop, like
> hadoop ....  -file MAPPER -mapper "$MAPPER" -file REDUCER -reducer "$REDUCER" ...
> How can I pass arguments to MAPPER?
>
> I tried -cmdenv name=val , but it does not work.
> Anybody can help me? Thanks lot.

I use -jobconf, for example

hadoop ... -jobconf my.mapper.arg1="foobar"

and in the map script, I get this by reading the environment variable

my_mapper_arg1

Hope this helps,
Rong-En Fan
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