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                ## Producer 消息發布的角色,支持分布式集群方式部署。Producer通過MQ的負載均衡模塊選擇相應的Broker集群隊列進行消息投遞,投遞的過程支持快速失敗并且低延遲 Producer與Name Server集群中的其中一個節點(隨機選擇)建立長連接,定期從Name Server取Topic路由信息,并向提供Topic服務的Master建立長連接,且定時向Master發送心跳。Producer完全無狀態,可集群部署 Producer每隔30s(由ClientConfig的pollNameServerInterval)從Name server獲取所有topic隊列的最新情況,這意味著如果Broker不可用,Producer最多30s能夠感知,在此期間內發往Broker的所有消息都會失敗。 Producer每隔30s(由ClientConfig中heartbeatBrokerInterval決定)向所有關聯的broker發送心跳,Broker每隔10s中掃描所有存活的連接,如果Broker在2分鐘內沒有收到心跳數據,則關閉與Producer的連接
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