Hadoop MapReduce intermediate output

Question

Is there a way to output to log the intermediate (Map Phase) output of a MapReduce Job without editing the Application? (The application is not mine, but the cluster is, and I can setup the Hadoop Cluster as I want to)

Answer 1

keep.task.files.pattern parameter can be used to keep the intermediate files. The intermediate files have to be manually cleaned up once the Job has been completed. Since, this is a map/reduce task property, it has to be set in the configuration file and the jar file packaged again.