thanks chris :) On Tue, Apr 7, 2015 at 10:43 PM, Chris Nauroth <cnaur...@hortonworks.com> wrote:
> Hello Shahil, > > In the current trunk codebase, the relevant files are > hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-co > re/src/main/java/org/apache/hadoop/mapred/MapTask.java and > hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-co > re/src/main/java/org/apache/hadoop/mapreduce/Mapper.java. MapTask manages > the execution of the mapper task, and eventually it calls Mapper#run, > which then calls into the implementation of the map method. BTW, you'll > also see a corresponding ReduceTask.java and Reducer.java in the same > directories if you need to look at those too. > > Input split calculation is performed by a subclass of InputFormat. > > http://hadoop.apache.org/docs/r2.6.0/api/org/apache/hadoop/mapreduce/InputF > ormat.html > > > I recommend looking at that. You also can navigate down through those > JavaDocs to identify subclasses of InputFormat, like FileInputFormat and > TextInputFormat, which you can then find in the source code. > > I hope this helps. > > Chris Nauroth > Hortonworks > http://hortonworks.com/ > > > > > > > On 4/7/15, 6:09 AM, "Shahil Varshney" <shahilvarsh...@gmail.com> wrote: > > >Sir , > >i want to know that which class in hadoop (internal source class) is > >responsible for calling map function for each key value pair(means calls > >map() function). > > > > and which class actually done the input split job. i want to create my > >own > >class for input split so please tell me . > >
