|NO.Z.00052|——————————|BigDataEnd|——|Hadoop&kafka.V37|——|kafka.v37|分区重新分配.v01|

一、分区重新分配

### --- [kafka高级特性解析]

~~~     [分区重新分配] 
~~~     [创建kafka集群实例二] 
~~~     [自定义分配分区] 

### --- 分区重新分配

~~~     向已经部署好的Kafka集群里面添加机器，我们需要从已经部署好的Kafka节点中复制相应的配置文件，
~~~     然后把里面的broker id修改成全局唯一的，最后启动这个节点即可将它加入到现有Kafka集群中。
~~~     # 问题：新添加的Kafka节点并不会自动地分配数据，无法分担集群的负载，除非我们新建一个topic。
~~~     需要手动将部分分区移到新添加的Kafka节点上，
~~~     Kafka内部提供了相关的工具来重新分布某个topic的分区。
~~~     # 在重新分布topic分区之前，我们先来看看现在topic的各个分区的分布位置：

二、启动zookeeper和kafka

### --- 启动zookeeper和kafka

[root@hadoop01 ~]# zkServer.sh start

[root@hadoop01 ~]# kafka-server-start.sh -daemon /opt/yanqi/servers/kafka/config/server.properties

### --- 通过zookeeper查看kafka启动状态

[root@hadoop01 ~]# zkCli.sh 
 
[zk: localhost:2181(CONNECTED) 0] ls /myKafka/brokers
[ids, topics, seqid]
[zk: localhost:2181(CONNECTED) 4] ls /myKafka/brokers/ids   
[0]

[zk: localhost:2181(CONNECTED) 7] get /myKafka/brokers/ids/0
~~~ 输出参数
{"listener_security_protocol_map":{"PLAINTEXT":"PLAINTEXT"},"endpoints":["PLAINTEXT://hadoop01:9092"],"jmx_port":-1,"host":"hadoop01","timestamp":"1632393439839","port":9092,"version":4}
cZxid = 0x649
ctime = Thu Sep 23 18:37:19 CST 2021
mZxid = 0x649
mtime = Thu Sep 23 18:37:19 CST 2021
pZxid = 0x649
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x10000072fd00001
dataLength = 186
numChildren = 0

三、在单机hadoop01下创建主题查看状态

### --- 创建主题：

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka \
--create --topic tp_re_01 --partitions 5 --replication-factor 1

### --- 查看主题信息：

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka \
--describe --topic tp_re_01
~~~输出参数
Topic:tp_re_01  PartitionCount:5    ReplicationFactor:1 Configs:
    Topic: tp_re_01 Partition: 0    Leader: 0   Replicas: 0 Isr: 0
    Topic: tp_re_01 Partition: 1    Leader: 0   Replicas: 0 Isr: 0
    Topic: tp_re_01 Partition: 2    Leader: 0   Replicas: 0 Isr: 0
    Topic: tp_re_01 Partition: 3    Leader: 0   Replicas: 0 Isr: 0
    Topic: tp_re_01 Partition: 4    Leader: 0   Replicas: 0 Isr: 0

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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