@Override
  public boolean isBroken() {
    return state == State.BROKEN;
  }
End the current block and complete file at namenode. You should call
{@link #recoverAndClose(CancelableProgressable)} if this method throws an exception.
hbase-asyncfs/src/main/java/org/apache/hadoop/hbase/io/asyncfs/FanOutOneBlockAsyncDFSOutput.java