版权声明：原创不易，转载请标明出处谢谢。 https://blog.csdn.net/shaock2018/article/details/87892120
防火墙没关：
[root@master-30018-30019-30020-qwxg6 ~]# hadoop fs -put test.txt /
19/02/23 14:34:57 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
19/02/23 14:36:04 INFO hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 172.17.5.0:50010
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1456)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1357)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:587)
19/02/23 14:36:04 INFO hdfs.DFSClient: Abandoning BP-837022277-172.17.30.3-1550895694147:blk_1073741827_1003
19/02/23 14:36:04 INFO hdfs.DFSClient: Excluding datanode 172.17.5.0:50010
19/02/23 14:36:04 WARN hdfs.DFSClient: Slow waitForAckedSeqno took 65214ms (threshold=30000ms)
[root@master-30018-30019-30020-qwxg6 ~]#