学习之地：http://kafka.apache.org/082/documentation.html#configuration
http://www.orchome.com/kafka/index
http://www.oschina.net/translate/kafka-design?lang=chs&p=1
kafka broker主配置文件：~/config/server.properties
标注：这里暂只涉及Broker Configs&Topic-level configuration~~~
kafka configure涉及以下几个方面：
Broker Configs：kafka broker主配置
Consumer Configs：kafka consumer配置
Producer Configs：kafka producer配置
Topic-level configuration：topic级别配置
1.Broker Configs之server.properties
从配置项可以分为以下几类：
a.
b.
c.
d.
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