在web aip调用时，datanode出现500错误，客户端收到

curl -i -T ./install_log.txt -X PUT "http://10.244.2.132:9864/webhdfs/v1/aicore-checker/tmpqmuplstl?op=CREATE&user.name=root&namenoderpcaddress=mycluster&createflag=&createparent=true&overwrite=false"
HTTP/1.1 100 Continue

HTTP/1.1 400 Bad Request
Content-Type: application/json; charset=utf-8
Content-Length: 166
Connection: close

{"RemoteException":{"exception":"IllegalArgumentException","javaClassName":"java.lang.IllegalArgumentException","message":"java.net.UnknownHostException: mycluster"}}

注：hdfs dfs 上传文件正常，java使用rpc调用正常

解决方案

/etc/hadoop/hdfs-site.xml增加dfs.client.failover.proxy.provider.mycluster 配置

	dfs.client.failover.proxy.provider.mycluster
	org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider

对于镜像已经固定的情况，我们需要把原镜像的/etc/hadoop复制出来，在外面修改后，用挂载目录的形式给镜像内部使用

      containers:
        volumeMounts:	  
        - name: hadoop-etc
          mountPath: /etc/hadoop
      volumes:
      - name: hadoop-etc
        hostPath:
          path: /home/aicore-1.7-update/datanode-etc