必须为所有Kafka经纪人分配 broker.id 。启动时，代理将在Zookeeper中创建一个短暂的节点，路径为 / broker / ids / $ id 。由于节点是短暂的，所以一旦代理断开连接，它将被移除，例如，通过关闭。

All Kafka brokers must be assigned a broker.id. On startup a broker will create an ephemeral node in Zookeeper with a path of /broker/ids/$id. As the node is ephemeral it will be removed as soon as the broker disconnects, e.g. by shutting down.

您可以查看短暂的代理节点列表，如下所示：

You can view the list of the ephemeral broker nodes like so:

echo dump | nc localhost 2181 | grep brokers

ZooKeeper客户端接口公开了许多命令; dump 列出集群的所有会话和临时节点。

The ZooKeeper client interface exposes a number of commands; dump lists all the sessions and ephemeral nodes for the cluster.

注意，上面假设：

• 您在上的默认端口（ 2181 ）上运行ZooKeeper localhost ，而 localhost 是群集的领导者


• 您的 zookeeper .connect Kafka config没有为你的Kafka集群指定一个chroot env，即它只是 host：port 而不是 host ：port / path

• You're running ZooKeeper on the default port (2181) on localhost, and that localhost is the leader for the cluster
• Your zookeeper.connect Kafka config doesn't specify a chroot env for your Kafka cluster i.e. it's just host:port and not host:port/path