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The "Hive/HowToContribute" page has been changed by JohnSichi.
http://wiki.apache.org/hadoop/Hive/HowToContribute?action=diff&rev1=19&rev2=20

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  The Hive build downloads a number of different Hadoop versions via ivy in 
order to compile "shims" which allow for compatibility with these Hadoop 
versions.  However, by default, the rest of Hive is only built and tested 
against a single Hadoop version (0.20.0 as of this writing, but check 
build.properties for the latest).  
  
- You can specify a different Hadoop version with 
-Dhadoop.version="<your-hadoop-version>".  By default, Hadoop tarballs are 
pulled from http://mirror.facebook.net/facebook/hive-deps, which contains 
Hadoop 0.17.2.1, 0.18.3, 0.19.0, and 0.20.0. If the version you want is not 
here, then you'll need to set hadoop.mirror to a different source.  For 0.19.2 
and 0.20.1, you can use http://mirror.facebook.net/apache or any other Apache 
mirror.  For other versions, you'll need to use http://archive.apache.org/dist 
(but don't use this unless you have to, since it's an overloaded server).
+ You can specify a different Hadoop version with 
-Dhadoop.version="<your-hadoop-version>".  By default, Hadoop tarballs are 
pulled from http://mirror.facebook.net/facebook/hive-deps, which contains 
Hadoop 0.17.2.1, 0.18.3, 0.19.0, and 0.20.0. If the version you want is not 
here, then you'll need to set hadoop.mirror to a different source.  For 0.19.2 
and 0.20.2, you can use http://mirror.facebook.net/apache or any other Apache 
mirror.  For other versions, you'll need to use http://archive.apache.org/dist 
(but don't use this unless you have to, since it's an overloaded server).
  
  === Unit Tests ===
  Please make sure that all unit tests succeed before and after applying your 
patch and that no new javac compiler warnings are introduced by your patch. 
Also see the information in the previous section about testing with different 
Hadoop versions if you want to verify compatibility with something other than 
the default Hadoop version.

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