mapreduce wordcount program got stuck

[#1]

Earlier it was working. I got output. But now it got stuck. Earlier I'm not able to kill that job, it shows your job already succeeded.  

[#2]

@Sunanna 

Validate the job status using below command.

hadoop job -status <hadoop_job_id>
yarn application -status <hadoop_application_id>

Depends upon the status validate the logs using below ,  If needed validate the Jstack of the child tasks for better understanding. 

yarn logs -applicationId <applicationId>