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1.视界

1.概述

kafka启动的时候，初始化了BrokerId

2. 入口

kafka.server.KafkaServer#startup /** Get or create cluster_id  格式如：oAm52n7NSaugaePYYVS1EA  * 唯一标识有一个集群，如果已经存在那么直接返回  * */_clusterId = getOrGenerateClusterId(zkClient)info(s"Cluster ID = $clusterId")/* generate brokerId */val (brokerId, initialOfflineDirs) = getBrokerIdAndOfflineDirsconfig.brokerId = brokerIdlogContext = new LogContext(s"[KafkaServer id=${config.brokerId}] ")this.logIdent = logContext.logPrefix// initialize dynamic broker configs from ZooKeeper. Any updates made after this will be// applied after DynamicConfigManager starts./*

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