[GitHub] [incubator-dolphinscheduler] anan0120 commented on issue #4161: [Bug][SQL] SQL query mode exception : Failed to obtain JDBC Connection ...

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anan0120 commented on issue #4161:
URL: https://github.com/apache/incubator-dolphinscheduler/issues/4161#issuecomment-739313659


   I have been tossing about the problem for a few days, and I have not been able to locate the specific cause. The driver has also been changed to 5.1.48, the server restarted and other methods have been tried without solution.
   
   It's hard to understand: other operations don't even have any problems with data. Only this sql component sql type is query, and the problem of druid timeout has been reported. I have been thinking about the details of eating, walking, and sleeping that I have overlooked. . . I finally decided on the machine room migration, and then took a look at the configuration file. The effort paid off. I really located the reason.
   
   Looking at the scheduling configuration file, it turns out that the master's database configuration is modified normally (so the main functions are not affected), and the metadata configuration on the worker has not been completely modified
   
   In the process of locating this problem, several big guys on the official website have been bothered by me. Thank you again for your patient guidance! !


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