How do I determine in my Java code which version of Hadoop I am running

[Steve Lewis <lo...@gmail.com>]

In 1.o I could say but this does not seem to work in 2.0 and has compile
issues in 0.2

So surely there is a SIMPLE way for my code tr determine the Hadoop version

Here assume HadoopMajorVersion  is an enum

  private static   private static HadoopMajorVersion getHadoopVersion() {
        // force the class loader to load a class in the package so we can
read the package
        Class hadoopVersionAnnotation = HadoopVersionAnnotation.class; //
make cure the class loader know about packages
        Package aPackage = Package.getPackage("org.apache.hadoop");
        if(aPackage == null)
             return Version0;
        HadoopVersionAnnotation annotation = (HadoopVersionAnnotation)
aPackage.getAnnotation(HadoopVersionAnnotation.class);
        if(annotation == null)
            return Version0;
        String version = annotation.version();
        HadoopMajorVersion[] versions = values();
        for (HadoopMajorVersion v : versions) {
             if(version.startsWith(v.getStartText()))
                 return v;
        }
        throw new IllegalStateException("Unknown Hadoop version " +
version);
    }



-- 
Steven M. Lewis PhD
4221 105th Ave NE
Kirkland, WA 98033
206-384-1340 (cell)
Skype lordjoe_com