}
@Override
public long renewDelegationToken(Token<DelegationTokenIdentifier> token)
throws IOException {
RenewDelegationTokenRequestProto req = RenewDelegationTokenRequestProto.newBuilder().
setToken(PBHelper.convert(token)).
build();
try {
return rpcProxy.renewDelegationToken(null, req).getNewExireTime();
} catch (ServiceException e) {