private static StreamHolder holder() throws IgniteInterruptedCheckedException {
  StreamHolder holder=holders.get();
  if (holder == null)   holders.set(holder=new StreamHolder());
  return holder;
}

private static StreamHolder holder ( ) throws IgniteInterruptedCheckedException { StreamHolder holder = holders . get ( ) ; if ( holder == null ) holders . set ( holder = new StreamHolder ( ) ) ; return holder ; }
gets holder from pool or thread local .
