@Override
    public void addReader(int subtaskId) {
        // send SuspendBinlogReaderEvent to source reader if the assigner's status is
        // suspended
        if (isSuspended(splitAssigner.getAssignerStatus())) {
            context.sendEventToSourceReader(subtaskId, new SuspendBinlogReaderEvent());
        }
    }
A MySQL CDC source enumerator that enumerates receive the split request and assign the split to
source readers.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/enumerator/MySqlSourceEnumerator.java