druid连接池校验连接不定时出现 “Unable to establish connection”

[hombooo]

Bug Description
druid连接池校验连接不定时出现 “Unable to establish connection”，程序中业务SQL还在正常执行，但同时druid连接池在校验时却获取不到连接，是否是bug?

To Reproduce
Steps to reproduce the behavior:

1. 业务日志：

 2024-09-09 22:19:45,642 ERROR [Druid-ConnectionPool-Create-448243316] c.alibaba.druid.pool.DruidDataSource [DruidDataSource.java : 2815] create connection SQLException, url: jdbc:TAOS://151.50.8.22:6030/landun_db_22?charset=UTF-8&locale=en_US.UTF-8&timezone=UTC-8, errorCode -2147483637, state 
java.sql.SQLException: TDengine ERROR (0x8000000b): Unable to establish connection
 at com.taosdata.jdbc.TSDBError.createSQLException(TSDBError.java:95)
 at com.taosdata.jdbc.TSDBJNIConnector.executeQuery(TSDBJNIConnector.java:183)
 at com.taosdata.jdbc.TSDBStatement.executeQueryImpl(TSDBStatement.java:76)
 at com.taosdata.jdbc.TSDBStatement.executeQuery(TSDBStatement.java:59)
 at com.taosdata.jdbc.TSDBStatement.executeQuery(TSDBStatement.java:39)
 at com.alibaba.druid.pool.DruidAbstractDataSource.validateConnection(DruidAbstractDataSource.java:1419)
 at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1719)
 at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2813)
[] 2024-09-09 22:19:45,659 ERROR [Druid-ConnectionPool-Create-1432184492] c.alibaba.druid.pool.DruidDataSource [DruidDataSource.java : 2815] create connection SQLException, url: jdbc:TAOS://151.50.1.74:6030/landun_db_hb_gps?charset=UTF-8&locale=en_US.UTF-8&timezone=UTC-8, errorCode -2147483637, state 
java.sql.SQLException: TDengine ERROR (0x8000000b): Unable to establish connection
 at com.taosdata.jdbc.TSDBError.createSQLException(TSDBError.java:95)
 at com.taosdata.jdbc.TSDBJNIConnector.executeQuery(TSDBJNIConnector.java:183)
 at com.taosdata.jdbc.TSDBStatement.executeQueryImpl(TSDBStatement.java:76)
 at com.taosdata.jdbc.TSDBStatement.executeQuery(TSDBStatement.java:59)
 at com.taosdata.jdbc.TSDBStatement.executeQuery(TSDBStatement.java:39)
 at com.alibaba.druid.pool.DruidAbstractDataSource.validateConnection(DruidAbstractDataSource.java:1419)
 at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:17

2. 客户端日志：

09/09 22:19:44.656856 00024564 TSC ERROR 0x31b8a0 error occurs, code:Unable to establish connection, return to user app, reqId:0x72968727a290cd22
09/09 22:19:44.656872 00024578 JNI ERROR jobj:0x7ff4c07ec710, conn:0x7ff3fc002650, code:0x8000000b, msg:Unable to establish connection
09/09 22:19:45.140282 00024595 TSC connecting to server, numOfEps:1 inUse:0 user:landun_user db:landun_db_22 key:landun_user:ea8197e57e6fb4172b10369fc2efe880:151.50.8.22:6030
09/09 22:19:45.140292 00024595 TSC ep:0, 151.50.8.22:6030
09/09 22:19:45.140965 00024567 TSC ERROR 0x31b8a2 error occurs, code:Unable to establish connection, return to user app, reqId:0x72968727a474cd24
09/09 22:19:45.141001 00024595 JNI ERROR jobj:0x7ff42c17b710, conn:0x7ff434002820, code:0x8000000b, msg:Unable to establish connection
09/09 22:19:45.157203 00024578 TSC connecting to server, numOfEps:1 inUse:0 user:zcdj_user db:landun_db_hb_gps key:zcdj_user:3d05286baefa4ee6b68c163e55bdf834:151.50.1.74:6030
09/09 22:19:45.157210 00024578 TSC ep:0, 151.50.1.74:6030
09/09 22:19:45.157892 00024561 TSC ERROR 0x31b8a4 error occurs, code:Unable to establish connection, return to user app, reqId:0x72968727a485cd26
09/09 22:19:45.157922 00024578 JNI ERROR jobj:0x7ff4c07ec710, conn:0x7ff3fc002f20, code:0x8000000b, msg:Unable to establish connection
09/09 22:19:45.641483 00024595 TSC connecting to server, numOfEps:1 inUse:0 user:landun_user db:landun_db_22 key:landun_user:ea8197e57e6fb4172b10369fc2efe880:151.50.8.22:6030
09/09 22:19:45.641491 00024595 TSC ep:0, 151.50.8.22:6030
09/09 22:19:45.642164 00024563 TSC ERROR 0x31b8a6 error occurs, code:Unable to establish connection, return to user app, reqId:0x72968727a66acd28
09/09 22:19:45.642187 00024595 JNI ERROR jobj:0x7ff42c17b710, conn:0x7ff434002210, code:0x8000000b, msg:Unable to establish connection
09/09 22:19:45.658248 00024578 TSC connecting to server, numOfEps:1 inUse:0 user:zcdj_user db:landun_db_hb_gps key:zcdj_user:3d05286baefa4ee6b68c163e55bdf834:151.50.1.74:6030
09/09 22:19:45.658256 00024578 TSC 

Environment (please complete the following information):

• TDengine Version [3.2.0.0]
• taos-jdbcdriver [3.2.7]

[trdmm]

怎么解决的

[yu285]

如果是时不时出现，可能是服务端出现了问题。建议先升级一下服务端再观察一下。

目前最新版是3.3.2.0，是三个月前的版本，建议等月底发版的 3.3.3.0 ，各方面都会更好些。如果急用的话，可以自己编译main分支。