How to use

containsGroup

method

in

org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker

 throw new AccessControlException("Non-super user cannot change owner.");
if (group != null && !pc.containsGroup(group)) {
 throw new AccessControlException("User does not belong to " + group
  + " .");

static HdfsFileStatus setOwner(
  FSDirectory fsd, String src, String username, String group)
  throws IOException {
 FSPermissionChecker pc = fsd.getPermissionChecker();
 INodesInPath iip;
 fsd.writeLock();
 try {
  iip = fsd.resolvePathForWrite(pc, src);
  src = iip.getPath();
  fsd.checkOwner(pc, iip);
  if (!pc.isSuperUser()) {
   if (username != null && !pc.getUser().equals(username)) {
    throw new AccessControlException("User " + username
      + " is not a super user (non-super user cannot change owner).");
   }
   if (group != null && !pc.containsGroup(group)) {
    throw new AccessControlException(
      "User " + username + " does not belong to " + group);
   }
  }
  unprotectedSetOwner(fsd, src, username, group);
 } finally {
  fsd.writeUnlock();
 }
 fsd.getEditLog().logSetOwner(src, username, group);
 return fsd.getAuditFileInfo(iip);
}