Then you can press F6 to run this Job.
During the execution, the JAR file and the class for the merge are generated in the local machine.
Once done, you can verify the results in the target directory you have specified, in the web console of the Hadoop distribution used.
If you need to obtain more details about the Job, it is recommended to use the web console of the Jobtracker provided by the Hadoop distribution you are using.
If you continue to import updated datasets to HDFS from the same source table, you can reuse the generated merge class to merge the datasets.