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From Vinayakumar B <vinayakuma...@huawei.com>
Subject RE: hadoop -Mapreduce
Date Mon, 09 Dec 2013 06:57:35 GMT
Hi Ranjini,

Please check this mapper class whether this suites your needs.

Thanks and Regards,
Vinayakumar B
From: Ranjini Rathinam [mailto:ranjinibecse@gmail.com]
Sent: 09 December 2013 11:13
To: user@hadoop.apache.org
Subject: Re: hadoop -Mapreduce


I need to use thread functionality to run more than one mapper class parallelly.

Please suggest with some sample code.

Thanks in advance.
On Fri, Dec 6, 2013 at 4:37 PM, Subroto <ssanyal@datameer.com<mailto:ssanyal@datameer.com>>
Hi Ranjini,

The number of mappers depend on InputSplits and which intern depends on size of input data.
The number of reducers can be configured by "mapred.reduce.tasks"

Further you can get more information on numbers of Maps and Reduce for a Job from:

Running parallel mappers and reducers depends on availability of map and reduce slots in the

Subroto Sanyal

On Dec 6, 2013, at 12:00 PM, Ranjini Rathinam wrote:


How to run more than one mapper and reduce parallelly.?

Please suggest.Thanks in advance.


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