Flink reads MySQL and PgSQL at the same time, and the program will get stuck without logs

One . problem

As the title ,flink The program will always get stuck initialize Stage , And there will be no logs

Two . solve

Read from the program mysql And pgsql The way to use is :

DriverManager.getConnection(URL, USERNAME, PASSWORD);

test , If only mysql, Or just ask pgsql There are normal data , At this point I wonder if there is a problem with this method
hold mysql Request to use the druid to get the connection instead

dataSource = new DruidDataSource();
dataSource.setDriverClassName(MysqlConfig.DriverName);
dataSource.setUrl(MysqlConfig.MYSQL_URL);
dataSource.setUsername(MysqlConfig.USERNAME);
dataSource.setPassword(MysqlConfig.PASSWORD);
dataSource.getConnection();

Restart the program , After discovery, you can request two databases at the same time

3、 ... and . doubt

I don't know whether this method has this limitation or flink Internally caused , I hope you can give me some advice

DriverManager.getConnection(URL, USERNAME, PASSWORD);