@Override
public boolean isFileClosed(String src) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
IsFileClosedRequestProto req = IsFileClosedRequestProto.newBuilder()
.setSrc(src).build();
try {
return rpcProxy.isFileClosed(null, req).getResult();
} catch (ServiceException e) {
IOException ioe = ProtobufHelper.getRemoteException(e);