HADOOP-11464 reinstates cygwin support. In the process, it sets HADOOP_HOME explicitly in hadoop-config.sh without checking if it has already been set.
Reinstate support for launching Hadoop processes on Windows using Cygwin.
Verify setting HADOOP_HOME explicitly works
archive-logs tool should use HADOOP_PREFIX instead of HADOOP_HOME
Hadoop personality does not capture the pre-requisite of hadoop-maven-plugins.