If we use async send message, local broker will receive too much requests, and will lead to flow controll, so I reduced loop times.
`org.apache.rocketmq.client.exception.MQBrokerException: CODE: 2 DESC: [TIMEOUT_CLEAN_QUEUE]broker busy, start flow control for a while, period in queue: 200ms, size of queue: 115` [ Full content available at: https://github.com/apache/rocketmq/pull/479 ] This message was relayed via gitbox.apache.org for [email protected]
