Monitoring Hadoop MapReduce Applications

While users have access to many tools that assist in performing large scale data analysis tasks, understanding the performance characteristics of their parallel computations, such as MapReduce jobs, remains difficult.  Step #1 is to create a test suite that you can reliably run after every change.

http://www.myhowto.org/java/hadoop/2013/03/06/monitoring-performance-of-your-hadoop-mapreduce-application/

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