public int getDftMemCacheFlushIntvl() {
        String atrVal =
                TStringUtils.getAttrValFrmAttributes(this.attributes,
                        TStoreConstants.TOKEN_MCACHE_FLUSH_INTVL);
        if (atrVal != null) {
            return Integer.parseInt(atrVal);
        }
        return 20000;
    }
Get broker config string

@return config string
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/bdbstore/bdbentitys/BdbBrokerConfEntity.java