January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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管理
Kafka
｜
137
9.1.1
创建主题
在集群里创建一个主题需要用到
3
个参数。这些参数是必须提供的，尽管有些已经有了
broker
级别的默认值。
主题名字
想要创建的主题的名字。
复制系数
主题的副本数量。
分区
主题的分区数量。
指定主题配置
可以在创建主题时显式地指定复制系数或者对配置进行覆盖，不过我们不打
算在这里介绍如何做到这些。稍后会介绍如何进行配置覆盖，它们是通过向
kafka-topics.sh
传递
--config
参数来实现的。本章还会介绍分区的重分配。
主题名字可以包含字母、数字、下划线以及英文状态下的破折号和句号。
主题的命名
主题名字的开头部分包含两个下划线是合法的，但不建议这么做。具有这种
格式的主题一般是集群的内部主题（比如
__consumer_offsets
主题用于保存
消费者群组的偏移量）。也不建议在单个集群里使用英文状态下的句号和下
划线来命名，因为主题的名字会被用在度量指标上，句号会被替换成下划线
（比如“
topic.1
”会变成“
topic_1
”）。
试着运行下面的命令：
kafka-topics.sh --zookeeper <zookeeper connect> --create --topic <string>
--replication-factor <integer> --partitions <integer>
这个命令将会创建一个主题，主题的名字为指定的值，并包含了指定数量的分区。集群会
为每个分区创建指定数量的副本。如果为集群指定了基于机架信息的副本分配策略，那么
分区的副本会分布在不同的机架上。如果不需要基于机架信息的分配策略，可以指定参数 ...
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