同事遇到一個比較詭異的問題，有個開發數據庫，navicate能連，jdbc不能連，他開始以為是mysql版本的問題；我覺得可能是參數的問題，加上了useSSL=false不管用。
后來想到這個庫需要連着vpn訪問，查到
這個教程，在idea 配置參數 -Djava.net.preferIPv4Stack=true 試了一下搞定
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mysql報錯 "code":"08S01","msg":"SQLSTATE
hiveserver2連接報錯： User: root is not allowed to impersonate anonymous (state=08S01,code=0)
Hive報錯 | User: root is not allowed to impersonate root (state=08S01,code=0) Beeline version 3.1.2 by Apache Hive
使用hiveserver2時出錯，hadoop is not allowed to impersonate hadoop (state=08S01,code=0)
HIVE報錯：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: 拒絕連接 (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連接MySQL失敗-[08S01] Communications link failure
hiveserver2連接出錯如下：Error: Could not open client transport with JDBC Uri: jdbc:hive2://hadoop01:10000: java.net.ConnectException: Connection refused (Connection refused) (state=08S01,code=0)
數據庫連接報錯：ERROR 1047 (08S01): WSREP has not yet prepared node for application use