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From "Jiri Pechanec (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-5953) Connect classloader isolation may be broken for JDBC drivers
Date Thu, 21 Sep 2017 08:52:00 GMT
Jiri Pechanec created KAFKA-5953:

             Summary: Connect classloader isolation may be broken for JDBC drivers
                 Key: KAFKA-5953
                 URL: https://issues.apache.org/jira/browse/KAFKA-5953
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions:
            Reporter: Jiri Pechanec
            Priority: Critical

Let's suppose there are two connectors deployed
# using JDBC driver (Debezium MySQL connector)
# using PostgreSQL JDBC driver (JDBC sink).

Connector 1 is started first - it executes a statement
Connection conn = DriverManager.getConnection(url, props);
As a result a {{DriverManager}} calls {{ServiceLoader}} and searches for all JDBC drivers.
The postgres driver from connector 2) is found associated with classloader from connector

Connector 2 is started after that - it executes a statement
connection = DriverManager.getConnection(url, username, password);

DriverManager finds the connector that was loaded in step before but becuase the classloader
is different - now we use classloader 2) so it refuses to load the class and no JDBC driver
is found.

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