public String getConfigStr() {
        if (StringUtils.isEmpty(configStr)) {
            String format = "[type:simple] [step:{0}] [retryTimes:{1}] [tableInfo:{2}({3},{4},{5})]";
            this.configStr = MessageFormat.format(format,
                String.valueOf(step),
                String.valueOf(retryTimes),
                tableName,
                nameColumnName,
                valueColumnName,
                gmtModifiedColumnName);
        }
        return configStr;
    }