@Override
    public synchronized void putConnectorConfig(String connName,
                                                final Map<String, String> config,
                                                boolean allowReplace,
                                                final Callback<Created<ConnectorInfo>> callback) {
        putConnectorConfig(connName, config, null, allowReplace, callback);
    }
Single process, in-memory "herder". Useful for a standalone Kafka Connect process.
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/standalone/StandaloneHerder.java