January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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Kafka
消费者——从
Kafka
读取数据
｜
57
RoundRobin
该策略把主题的所有分区逐个分配给消费者。如果使用
RoundRobin
策略来给消费者
C1
和消费者
C2
分配分区，那么消费者
C1
将分到主题
T1
的分区
0
和分区
2
以及主题
T2
的分区
1
，消费者
C2
将分配到主题
T1
的分区
1
以及主题
T2
的分区
0
和分区
2
。一般
来说，如果所有消费者都订阅相同的主题（这种情况很常见），
RoundRobin
策略会给所
有消费者分配相同数量的分区（或最多就差一个分区）。
可以通过设置 partition.assignment.strategy 来选择分区策略。默认使用的是 org.
apache.kafka.clients.consumer.RangeAssignor，这个类实现了
Range
策略，不过也可以
把它改成 org.apache.kafka.clients.consumer.RoundRobinAssignor。我们还可以使用自定
义策略，在这种情况下，partition.assignment.strategy 属性的值就是自定义类的名字。
8. client.id
该属性可以是任意字符串，
broker
用它来标识从客户端发送过来的消息，通常被用在日志、
度量指标和配额里。
9. max.poll.records
该属性用于控制单次调用
call()
方法能够返回的记录数量，可以帮你控制在轮询里需要处
理的数据量。
10. receive.buffer.bytes
和
send.buffer.bytes
socket
在读写数据时用到的 ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.