public WakeUpTarget getTarget() {
        return target;
    }
The {@link SourceEvent} that {@link MySqlSourceEnumerator} sends to {@link MySqlSourceReader} to
wake up source reader to consume split again.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/events/WakeupReaderEvent.java