private Response getPigVersion() {
    return SimpleWebException.buildMessage(HttpStatus.NOT_IMPLEMENTED_501,
        null, "Pig version request not yet implemented");
  }
Find the version of Hive, Hadoop, or Pig that is being used in this
interface.
hcatalog/webhcat/svr/src/main/java/org/apache/hive/hcatalog/templeton/VersionDelegator.java