Hadoop 集群环境上删除节点时，配置完exclues文件后，执行hdfs dfsadmin -refreshNodes
命令，但节点一直无法删除，状态一直保持Normal。

[https://www.cndba.cn@hadoopmaster hadoop]$ hdfs dfsadmin -refreshNodes
Refresh nodes successful
[https://www.cndba.cn@hadoopmaster hadoop]$

[https://www.cndba.cn@hadoopmaster ~]$ hdfs dfsadmin -report
…
Name: 192.168.20.85:9866 (hadoopslave5)
Hostname: hadoopslave5
Decommission Status : Normal
Configured Capacity: 89936470016 (83.76 GB)
DFS Used: 233910272 (223.07 MB)
Non DFS Used: 4794318848 (4.47 GB)
DFS Remaining: 84908240896 (79.08 GB)
DFS Used%: 0.26%
DFS Remaining%: 94.41%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Thu Jan 24 05:33:11 CST 2019
Last Block Report: Thu Jan 24 04:03:38 CST 2019
Num of Blocks: 608

期间没有任何错误，所以怀疑是配置文件hdfs-site.xml的问题，重新对配置文件的格式进行了排版，在执行，果然正常执行了：

[https://www.cndba.cn@hadoopmaster hadoop]$ vim hdfs-site.xml

<property>
        <name>dfs.hosts.exclude</name>
        <value>/home/cndba/hadoop/etc/hadoop/excludes</value>
</property>




[https://www.cndba.cn@hadoopmaster ~]$ hdfs dfsadmin -report
…
Decommissioning datanodes (1):

Name: 192.168.20.85:9866 (hadoopslave5)
Hostname: hadoopslave5
Decommission Status : Decommission in progress
Configured Capacity: 89936470016 (83.76 GB)
DFS Used: 233910272 (223.07 MB)
Non DFS Used: 4794646528 (4.47 GB)
DFS Remaining: 84907913216 (79.08 GB)
DFS Used%: 0.26%
DFS Remaining%: 94.41%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Thu Jan 24 05:42:24 CST 2019
Last Block Report: Thu Jan 24 05:36:57 CST 2019
Num of Blocks: 608

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