linux虚拟机内集群报错：java.net.ConnectException: Connection refused，
2019-03-18 15:18:15,750 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: IOException in offerService
java.io.EOFException: End of File Exception between local host is: "localhost/127.0.0.1"; destination host is: "hdp-01":9000; : java.io.EOFException; For more details see:
在vi /etc/hosts时，删掉
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6