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MapReduce >> mail # user >> Doubt on Input and Output Mapper - Key value pairs


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Ramasubramanian Narayanan... 2012-11-07, 12:39
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Mahesh Balija 2012-11-08, 05:53
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Re: Doubt on Input and Output Mapper - Key value pairs
The answer (a) is correct, in general.

On Wed, Nov 7, 2012 at 6:09 PM, Ramasubramanian Narayanan
<[EMAIL PROTECTED]> wrote:
> Hi,
>
> Which of the following is correct w.r.t mapper.
>
> (a) It accepts a single key-value pair as input and can emit any number of
> key-value pairs as output, including zero.
> (b) It accepts a single key-value pair as input and emits a single key and
> list of corresponding values as output
>
>
> regards,
> Rams

--
Harsh J
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB