loserwang1024 opened a new pull request, #3388:
URL: https://github.com/apache/flink-cdc/pull/3388
Current, inJdbcConnectionPools is static instance, so the datasource pools
in it won't be recycle when reader close. It will cause memory leak.
```java
public class JdbcConnectionPools implements
ConnectionPools<HikariDataSource, JdbcSourceConfig> {
private static final Logger LOG =
LoggerFactory.getLogger(JdbcConnectionPools.class);
private static JdbcConnectionPools instance;
private final Map<ConnectionPoolId, HikariDataSource> pools = new
HashMap<>();
private static final Map<String, JdbcConnectionPoolFactory> POOL_FACTORY_MAP
= new HashMap<>();
```
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