afka与Zookeeper的关联性

ooKeeper主要负责协调管理并保存Kafka集群的所有元数据信息，包括以下内容：

1. 集群的Broker信息：存储了所有运行中的Broker以及它们的ID。可以通过`ls /brokers`命令查看当前运行的Broker列表。

```plaintext

[zk: localhost:2181(CONNECTED) 28] ls /brokers

[ids, topics, seqid]

```

2. Topic信息：存储了创建的主题及其相关信息。通过`get /brokers/topics/t1/partitions/1/state`和`get /brokers/topics/t1/partitions/0/state`命令可以查看特定主题的分区状态。

3. 控制器信息：存储了Kafka集群的master选举信息。通过`get /controller`命令可以查看当前的控制器信息。

4. Kafka ID文件：存储了每个Broker的ID信息，该文件位于`/opt/module/kafka-2.11/datas/meta.properties`,内容为：`broker.id=1`。

综上所述，ZooKeeper在Kafka集群中起到了关键的作用，它不仅负责保存和管理元数据信息，还负责协调整个集群的运作。

Zxid = 0x500000047

ctime = Thu Dec 03 14:18:52 CST 2020

mZxid = 0x500000078

mtime = Thu Dec 03 16:10:51 CST 2020

pZxid = 0x500000047

cversion = 0

dataVersion = 9

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 2

numChildren = 0

consumers存放消费者组的相关信息，如下：

- [zk: localhost:2181(CONNECTED) 22] ls /consumers

- [console-consumer-37119] --> 消费者组

- [zk: localhost:2181(CONNECTED) 24] ls /consumers/console-consumer-37119

- [ids, owners, offsets]

- [zk: localhost:2181(CONNECTED) 25] ls /consumers/console-consumer-37119/offsets

- [t1] --> 主题

- [zk: localhost:2181(CONNECTED) 26] ls /consumers/console-consumer-37119/offsets/t1

- [0, 1] --> 分区

- [zk: localhost:2181(CONNECTED) 27] get /consumers/console-consumer-37119/offsets/t1/0

- 消费者偏移量

- cZxid = 0x500000047

- ctime = Thu Dec 03 14:18:52 CST 2020

- mZxid = 0x500000078

- mtime = Thu Dec 03 16:10:51 CST 2020

- pZxid = 0x500000047

- cversion = 0

- dataVersion = 9

- aclVersion = 0

- ephemeralOwner = 0x0

- dataLength = 2

- numChildren = 0

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