@Override
  public void stop() {
    stopped = true;
    serverTransport_.interrupt();
  }
Loop until {@link ExecutorService#awaitTermination} finally does return without an interrupted
exception. If we don't do this, then we'll shut down prematurely. We want to let the executor
service clear its task queue, closing client sockets appropriately.
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift/TBoundedThreadPoolServer.java