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Hadoop 2.2.0 in the Hortonworks Sandbox (HDP 2) 
For the benefit of my fellow Hadoop-ies, as I work thru the evolving coolness of the Hadoop User Experience (HUE) under HDP 2 I wanted to pass in a few observations by-value.

Use Java 6


While we could use Java 1.7, note that the following message means that we had better not use the same as the default compatibility mode:


The google-candy here is:

Java MapReduce
MaxTemperature : Unsupported major.minor version 51.0


What the run time is trying to tell us is to use Java 1.6.

Logging into the VM will - of course - verify as much:



The solution is to simply re-deploy as a JDK 1.6 rendition. Even the Job Designer's "Job Design" need not change.

Moving the source code from the 3rd edition of O'Reilly's "Hadoop: The Definitive Guide" by Tom White to Hadoop 2.2.0, I am also bumping into allot of compatibility warnings and issues.

Stay tuned!!

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