同事遇到一个比较诡异的问题，有个开发数据库，navicate能连，jdbc不能连，他开始以为是mysql版本的问题；我觉得可能是参数的问题，加上了useSSL=false不管用。
后来想到这个库需要连着vpn访问，查到
这个教程，在idea 配置参数 -Djava.net.preferIPv4Stack=true 试了一下搞定
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mysql报错 "code":"08S01","msg":"SQLSTATE
hiveserver2连接报错： User: root is not allowed to impersonate anonymous (state=08S01,code=0)
Hive报错 | User: root is not allowed to impersonate root (state=08S01,code=0) Beeline version 3.1.2 by Apache Hive
使用hiveserver2时出错，hadoop is not allowed to impersonate hadoop (state=08S01,code=0)
HIVE报错：Error: Error while processing statement: FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask (state=08S01,code=2)
Error: Could not open client transport with JDBC Uri: jdbc:hive2://localhost:10000: java.net.ConnectException: 拒绝连接 (Connection refused) (state=08S01,code=0)
Could not open client transport with JDBC Uri: jdbc:hive2://localhost:10000: Invalid status 16 (state=08S01,code=0)
IDEA连接MySQL失败-[08S01] Communications link failure
hiveserver2连接出错如下：Error: Could not open client transport with JDBC Uri: jdbc:hive2://hadoop01:10000: java.net.ConnectException: Connection refused (Connection refused) (state=08S01,code=0)
数据库连接报错：ERROR 1047 (08S01): WSREP has not yet prepared node for application use