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Can we run mapreduce job from eclipse IDE on fully distributed mode hadoop cluster?

+1 vote
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A mapreduce job can be run as jar file from terminal or directly from eclipse IDE. When a job run as jar file from terminal it uses multiple jvm and all resources of cluster. Does the same thing happen when we run from IDE. I have run a job on both and it takes less time on IDE than jar file on terminal.

posted Apr 10, 2015 by Sudhakar Singh

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1 Answer

+1 vote

I could be wrong here, but the way I understand things I do not think that is even possible to run the JAR file from your PC. There are two things that you need to realize.

1) How is the JAR file going to connect to the cluster

2) How is the JAR file going to be distributed to the cluster.

Again I could be wrong here in my response, so anyone else on the list feel free to correct me. I am still a novice to Hadoop and have only worked with it on amazon EMR.

answer Apr 11, 2015 by anonymous
I have installed and configured my own hadoop cluster with one master node and 7 slave nodes. Now I just want to make sure that job running through Eclipse is internally same as running through jar file. Also job history server and web ui 8088 shows only list of those jobs which are submitted through jar using terminal.
I think you can have a try at http://hdt.incubator.apache.org/
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public class MaxMinReducer extends Reducer {
int max_sum=0; 
int mean=0;
int count=0;
Text max_occured_key=new Text();
Text mean_key=new Text("Mean : ");
Text count_key=new Text("Count : ");
int min_sum=Integer.MAX_VALUE; 
Text min_occured_key=new Text();

 public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
       int sum = 0;           

       for (IntWritable value : values) {
             sum += value.get();
             count++;
       }

       if(sum < min_sum)
          {
              min_sum= sum;
              min_occured_key.set(key);        
          }     


       if(sum > max_sum) {
           max_sum = sum;
           max_occured_key.set(key);
       }          

       mean=max_sum+min_sum/count;
  }

 @Override
 protected void cleanup(Context context) throws IOException, InterruptedException {
       context.write(max_occured_key, new IntWritable(max_sum));   
       context.write(min_occured_key, new IntWritable(min_sum));   
       context.write(mean_key , new IntWritable(mean));   
       context.write(count_key , new IntWritable(count));   
 }
}

Here I am writing minimum,maximum and mean of wordcount.

My input file :

high low medium high low high low large small medium

Actual output is :

high - 3------maximum

low - 3--------maximum

large - 1------minimum

small - 1------minimum

but i am not getting above output ...can anyone please help me?

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