January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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Kafka
生产者——向
Kafka
写入数据
｜
33
我们从创建一个
ProducerRecord
对象开始，
ProducerRecord
对象需要包含目标主题和要发
送的内容。我们还可以指定键或分区。在发送
ProducerRecord
对象时，生产者要先把键和
值对象序列化成字节数组，这样它们才能够在网络上传输。
接下来，数据被传给分区器。如果之前在
ProducerRecord
对象里指定了分区，那么分区器
就不会再做任何事情，直接把指定的分区返回。如果没有指定分区，那么分区器会根据
ProducerRecord
对象的键来选择一个分区。选好分区以后，生产者就知道该往哪个主题和
分区发送这条记录了。紧接着，这条记录被添加到一个记录批次里，这个批次里的所有消
息会被发送到相同的主题和分区上。有一个独立的线程负责把这些记录批次发送到相应的
broker
上。
服务器在收到这些消息时会返回一个响应。如果消息成功写入
Kafka
，就返回一个
RecordMetaData
对象，它包含了主题和分区信息，以及记录在分区里的偏移量。如果写入
失败，则会返回一个错误。生产者在收到错误之后会尝试重新发送消息，几次之后如果还
是失败，就返回错误信息。
3.2
创建
Kafka
生产者
要往
Kafka
写入消息，首先要创建一个生产者对象，并设置一些属性。
Kafka
生产者有
3
个必选的属性。
bootstrap.servers
该属性指定
broker
的地址清单，地址的格式为 host:port。清单里不需要包含所有的
broker
地址，生产者会从给定的
broker ...
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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.