November 2022
Beginner to intermediate
346 pages
11h
Chinese
Content preview from Kafka权威指南（第2版）
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226
｜
第
12
章
版本检查
Kafka
的很多命令行工具对
Kafka
版本有所依赖
，一些命令可能会将数据保
存在
ZooKeeper
中而不是
broker
中。因此，你需要确保命令行工具的版本与
集群
broker
的版本相匹配。直接使用
broker
自带的命令行工具是最保险的。
12.1.1
创建新主题
在使用
--create
命令创建新主题时，必须提供几个参数，即使其中一些参数可能已经有了
broker
级别的默认值
。还可以通过
--config
选项指定其他参数和覆盖默认值，本章将在后
面部分讨论这方面的内容。下面是必须提供的
3
个参数。
--topic
想要创建的主题的名字。
--replication-factor
主题的副本数量。
--partitions
主题的分区数量。
主题命名最佳实践
主题的名字可以包含字母数字字符、下划线、破折号和点号，但不建议使用
点号。
Kafka
的内部指标会将点号转成下划线
（例如，“
topic.1
”在指标中会
变成“
topic_1
”
)
，这可能会导致主题名称冲突。
另外，避免使用双下划线作为主题名字的前缀。根据约定，
Kafka
内部主题的
名字以双下划线开头（例如，用于保存消费者组偏移量的
__consumer_offsets
主题）。因此，为了避免冲突，不建议使用以双下划线开头的主题名字。
创建一个新主题非常简单，只需像下面这样运行
kafka-topics.sh
。
# kafka-topics.sh --bootstrap-server <connection-string>:<port> --create ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.