private String getFailoverServiceKey(MasterInfo masterInfo, String serviceName) {
        return new StringBuilder(256).append(serviceName)
                .append(TokenConstants.GROUP_SEP)
                .append(masterInfo.getMasterClusterStr()).toString();
    }
shutdown and recycle the connection resources

@throws Exception
inlong-tubemq/tubemq-core/src/main/java/org/apache/inlong/tubemq/corerpc/RpcServiceFactory.java