You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-user@hadoop.apache.org by "Francis.Hu" <fr...@reachjunction.com> on 2013/09/02 11:48:19 UTC
答复: Is there any way to set Reducer to output to multi-places?
Hi, Rahul
I found the class MultipleOutputs which has to do with what I want . It can make Reducers to write to additional outputs(File and Database in my Env.) other than the job default output.
http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapred/lib/MultipleOutputs.html
The class comments says below that I want to implement in my project:
* <p>
* Case one: writing to additional outputs other than the job default output.
*
* Each additional output, or named output, may be configured with its own
* <code>OutputFormat</code>, with its own key class and with its own value
* class.
* </p>
Anyway, thanks! Rahul. Your link leads me to the class MultipleOutputs :).
Thanks,
Francis.Hu.
发件人: Rahul Bhattacharjee [mailto:rahul.rec.dgp@gmail.com]
发送时间: Monday, September 02, 2013 17:12
收件人: user@hadoop.apache.org
主题: Re: Is there any way to set Reducer to output to multi-places?
This might help
http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapred/lib/MultipleOutputFormat.html
Thanks,
Rahul
On Mon, Sep 2, 2013 at 2:38 PM, Francis.Hu <fr...@reachjunction.com> wrote:
hi, All
Is there any way to set Reducer to output to multi-places ? For example: a reducer's result can be output to HDFS and Database concurrently.
Thanks,
Francis.Hu