* Renaming ConfigurationHelper to Instantiator
* Doc improvements and typo fixes
* Bringing getInstance() methods into consistent order
* Raising exception instead of logging error if instantion fails
Changed the events’ `source` structure to optionally contain the identifier of the MySQL thread where appropriate. The thread is included on each `BEGIN` binlog event, so these are captured and added to all of the associated change events produced for that transaction.
The version of the DB server required for this to work is at least 9.4. To be able to stream logical changes, the code relies on enhancements to the JDBC driver which are not yet public. Therefore, the current codebase includes the sources for the JDBC driver.
The commit also updates the general DBZ build system for:
* custom checkstyle package exclusions - required by the Postgres driver the protobuf code for now
* adds support for debugging Surefire and Failsafe
The Travis-CI builds run the Maven build using the `assembly` profile, and this has been failing quite a bit lately.
The first problem appears to be that the Travis-CI environment recently changed to have port 3306 taken, which means that our build fails to start any Docker containers for MySQL that attempt to use this port. A simple fix is to use different ports for the assembly build.
However, trying to change the port numbers for some of the profiles caused a lot of problems, and to correct these required refactoring how the properties are set. The Docker Maven plugin is now configured with separate properties that are set once (depending upon the profile) to determine the port assignments of the various Docker containers. The Failsafe plugin executions then use these Maven properties when setting the system variables (e.g., `database.host`) needed in the integration tests. This appears to have worked, but it still is a bit fragile. For example, the assembly profile defines several Failsafe executions, and during this profile these should be the only executions run; however, if not all the properties are set properly, the build seems to also run the default Failsafe execution in addition to the other `assembly` profile executions. (I think properties can’t only be defined in the execution, but need to also be defined in the Failsafe configuration.)
The “alternative” MySQL Docker images were removed, since they basically should not provide any different behavior than the `mysql/mysql-server` images we normally used. The extra containers required a lot more resources to run and dramatically increased the complexity of the build.
A few other trivial changes were made.