在我使用spark对接kudu的过程中，出现如下错误：
坑1: Caused by: org.apache.kudu.client.NoLeaderFoundException
Caused by: org.apache.kudu.client.NoLeaderFoundException: Master config (192.168.1.117:7051) has no leader.
Exceptions received: org.apache.kudu.client.RecoverableException:
[peer master-192.168.1.117:7051(192.168.1.117:7051)] encountered a read timeout; closing the channel
重点分析:
Master config (192.168.1.117:7051) has no leader : 客户端找不到master的leader
encountered a read timeout : 遭遇读取超时
因为kudu客户端连接kudu服务器时,服务器返回master的主机名
要想知道master返回的主机名是什么，可以直接到web-ui上去查看。
注意是master的web-ui,即8051端口页面：
查看自己master 返回的leader：
http://192.168.1.117:8051/masters
rpc_addresses { host: "spark003" port: 7051 }
http_addresses { host: "spark003" port: 8051 }
software_version: "kudu 1.7.0-cdh5.15.0 (rev 7dd4889729bb5ee0b331a5a6c3cd4427dbf79308)"
https_enabled: false
这个rpc_addresses 的 spark003 会返回给你的客户端，这个时候你的客户端就得能够解析才行
问题就是出在这儿。我本地的hosts 文件并没有这个解析
我是windows ,hosts文件位置在：
C:WindowsSystem32driversetc
# add a record
192.168.1.117 spark003
最后，问题，完美解决~~
坑2: Caused by: java.lang.IllegalArgumentException: cannot import authentication data from a different user: old=’’, new=‘liuge’
最终解决：
[root@spark001 conf]# vim master.gflagfile
-rpc_encryption=disabled
-rpc_authentication=disabled
-trusted_subnets=0.0.0.0/0
# 重启master server
[root@spark001 conf]# /etc/init.d/kudu-master restart
Stopped Kudu Master Server: [ OK ]
Started Kudu Master Server (kudu-master): [ OK ]
[root@spark001 conf]#
坑3:Exception in thread “main” org.apache.kudu.client.NonRecoverableException: can not complete before timeout: KuduRpc
我一开始对于这个错误，还真的是很纳闷。各种搜索解决，都无果，
后来，我尝试把tserver.gflagfile 也添加如上配置就可以了
[root@spark001 conf]# vim tserver.gflagfile
-rpc_encryption=disabled
-rpc_authentication=disabled
-trusted_subnets=0.0.0.0/0
# 重启master server
[root@spark001 conf]# /etc/init.d/kudu-master restart
Stopped Kudu Master Server: [ OK ]
Started Kudu Master Server (kudu-master): [ OK ]
[root@spark001 conf]#