[FLINK-19435] Deadlock when loading different driver classes concurrently using Class.forName - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: 1.10.2
Fix Version/s: 1.12.1, 1.13.0
Component/s: Connectors / JDBC
Labels:
- pull-request-available

Description

when we sink data to multi jdbc outputformat ,

protected void establishConnection() throws SQLException, ClassNotFoundException {
 Class.forName(drivername);
 if (username == null) {
 connection = DriverManager.getConnection(dbURL);
 } else {
 connection = DriverManager.getConnection(dbURL, username, password);
 }
}

may cause jdbc driver deadlock. it need to change to synchronized function.