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And here is a screencast for the same. Distributed applications are by nature difficult to debug, Hadoop is no exception. This blog entry will try to explain how to put break points and debug a user defined Java MapReduce program in Eclipse. As we move from one more to another in the same order, the debugging becomes harder and new bugs are found on the way.
Standalone mode with the default Hadoop configuration properties allows MapReduce programs to be debugged in Eclipse. Create a Java Project in Eclipse. For the Java project created in the earlier step, add the following dependencies commons-configuration The dependencies are available by downloading and extracting a Hadoop release.
The project folder structure should look like below, without any compilation errors. Add the input and the output folder as the arguments to the MaxTemperature.
And on refreshing the project, an output folder should appear as should below on successful completion of the MapReduce job. To rerun the program, the output folder has to be deleted. As in the case of any Java program, break points can be put in the MapReduce driver, mapper, reducer code and debugged.
Note 5th March, The above instructions have been tried on Ubuntu These tools are not available by default in Windows and you might get error as mentioned in this threadwhen trying the steps mentioned in this blog on a Windows machine.
One alternative it to install Cygwin on Windows as mentioned in this tutorial. This might or might not work smoothly. Microsoft is working very aggressively to port Hadoop to the Windows platform and has released HDInsight recently.
Check this and this for more details. This is the best bet for all the Windows fans.
Posted by Praveen Sripati at 2:Join Algorithms using Map/Reduce Jairam Chandar T H E U NIVE R S I T Y O F E DINB U R G H Master of Science Computer Science School of Informatics University of Edinburgh Debugging a Hadoop MapReduce Program in Eclipse Thank You for your posts.
I am doing my Master Thesis now and your web entries are very helpful. @Madhu Reddy Why to drill someone's head about windows? Better try to run it on linux.
Debugging a Hadoop MapReduce Program in Eclipse. Note: Also don't forget to do check another entry on how. Sam Stokes on Research in your life and studies Sam Stokes on Research in your life and studies Sam Stokes writes about Research in a way that is accessibile by students in College or considering their College/University Career or someone who is a life long learner!
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