Is JDK 1.7 is supported in the common Hadoop distros? Hortonworks doc doesn't seem to list a version. A Hortonworks forum page claims JDK 1.7 isn't supported as of April 2013: http://hortonworks.com/community/forums/topic/jdk-7/
CDH4 claims JDK 1.6 and 1.7 support: http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH4/latest/CDH4-Requirements-and-Supported-Versions/cdhrsv_topic_3.html CDH3 requires JDK 1.6: http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH3/CDH3u6/CDH3-Installation-Guide/cdh3ig_topic_24.html
