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From Ranjini Rathinam <ranjinibe...@gmail.com>
Subject Re: hadoop -Mapreduce
Date Mon, 09 Dec 2013 07:04:12 GMT
hi,

Will these class support in hadoop 0.20 version. I am using this only.?

Please suggest.

Thanksin advance,

Ranjini.R

On Mon, Dec 9, 2013 at 12:27 PM, Vinayakumar B <vinayakumar.b@huawei.com>wrote:

>  Hi Ranjini,
>
>
>
> Please check this mapper class whether this suites your needs.
>
> org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper
>
>
>
> 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
>
>
>
> HI,
>
>
>
> 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> wrote:
>
> 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:
>
> http://wiki.apache.org/hadoop/HowManyMapsAndReduces
>
>
>
> Running parallel mappers and reducers depends on availability of map and
> reduce slots in the cluster.
>
>
>
> Cheers,
>
> Subroto Sanyal
>
>
>
> On Dec 6, 2013, at 12:00 PM, Ranjini Rathinam wrote:
>
>
>
>  HI,
>
>
>
> How to run more than one mapper and reduce parallelly.?
>
>
>
> Please suggest.Thanks in advance.
>
>
>
> Ranjini.
>
>
>
>
>

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