private RSGroupInfo getRSGroupInfo(final String groupName) throws ConstraintException {
    RSGroupInfo rsGroupInfo = holder.groupName2Group.get(groupName);
    if (rsGroupInfo == null) {
      throw new ConstraintException("RSGroup " + groupName + " does not exist");
    }
    return rsGroupInfo;
  }
Table descriptor for <code>hbase:rsgroup</code> catalog table
hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.java