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1.为什么要使用 kafka？为什么要使用消息队列？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#1%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E4%BD%BF%E7%94%A8-kafka%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E4%BD%BF%E7%94%A8%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97
2.Kafka中的ISR、AR又代表什么？ISR的伸缩又指什么？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#2kafka%E4%B8%AD%E7%9A%84israr%E5%8F%88%E4%BB%A3%E8%A1%A8%E4%BB%80%E4%B9%88isr%E7%9A%84%E4%BC%B8%E7%BC%A9%E5%8F%88%E6%8C%87%E4%BB%80%E4%B9%88
3.kafka中的broker 是干什么的？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#3kafka%E4%B8%AD%E7%9A%84broker-%E6%98%AF%E5%B9%B2%E4%BB%80%E4%B9%88%E7%9A%84
4.kafka中的 zookeeper 起到什么作用？可以不用zookeeper么？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#4kafka%E4%B8%AD%E7%9A%84-zookeeper-%E8%B5%B7%E5%88%B0%E4%BB%80%E4%B9%88%E4%BD%9C%E7%94%A8%E5%8F%AF%E4%BB%A5%E4%B8%8D%E7%94%A8zookeeper%E4%B9%88
5.kafka follower如何与leader同步数据？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#5kafka-follower%E5%A6%82%E4%BD%95%E4%B8%8Eleader%E5%90%8C%E6%AD%A5%E6%95%B0%E6%8D%AE
6.什么情况下一个 broker 会从 ISR 中被踢出去？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#6%E4%BB%80%E4%B9%88%E6%83%85%E5%86%B5%E4%B8%8B%E4%B8%80%E4%B8%AA-broker-%E4%BC%9A%E4%BB%8E-isr-%E4%B8%AD%E8%A2%AB%E8%B8%A2%E5%87%BA%E5%8E%BB
7.kafka 为什么那么快？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#7kafka-%E4%B8%BA%E4%BB%80%E4%B9%88%E9%82%A3%E4%B9%88%E5%BF%AB
8.kafka producer如何优化打入速度？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#8kafka-producer%E5%A6%82%E4%BD%95%E4%BC%98%E5%8C%96%E6%89%93%E5%85%A5%E9%80%9F%E5%BA%A6
9.kafka producer 打数据，ack 为 0， 1， -1 的时候代表啥，设置 -1 的时候，什么情况下，leader 会认为一条消息 commit 了	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#9kafka-producer-%E6%89%93%E6%95%B0%E6%8D%AEack--%E4%B8%BA-0-1--1-%E7%9A%84%E6%97%B6%E5%80%99%E4%BB%A3%E8%A1%A8%E5%95%A5-%E8%AE%BE%E7%BD%AE--1-%E7%9A%84%E6%97%B6%E5%80%99%E4%BB%80%E4%B9%88%E6%83%85%E5%86%B5%E4%B8%8Bleader-%E4%BC%9A%E8%AE%A4%E4%B8%BA%E4%B8%80%E6%9D%A1%E6%B6%88%E6%81%AF-commit-%E4%BA%86
10.kafka unclean 配置代表啥？会对 spark streaming 消费有什么影响？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#10kafka--unclean-%E9%85%8D%E7%BD%AE%E4%BB%A3%E8%A1%A8%E5%95%A5%E4%BC%9A%E5%AF%B9-spark-streaming-%E6%B6%88%E8%B4%B9%E6%9C%89%E4%BB%80%E4%B9%88%E5%BD%B1%E5%93%8D
11.如果leader crash时，ISR为空怎么办？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#11%E5%A6%82%E6%9E%9Cleader-crash%E6%97%B6isr%E4%B8%BA%E7%A9%BA%E6%80%8E%E4%B9%88%E5%8A%9E
12.kafka的message格式是什么样的？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#12kafka%E7%9A%84message%E6%A0%BC%E5%BC%8F%E6%98%AF%E4%BB%80%E4%B9%88%E6%A0%B7%E7%9A%84
13.kafka中consumer group 是什么概念？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#13kafka%E4%B8%ADconsumer-group-%E6%98%AF%E4%BB%80%E4%B9%88%E6%A6%82%E5%BF%B5
14.Kafka中的消息是否会丢失和重复消费？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#14kafka%E4%B8%AD%E7%9A%84%E6%B6%88%E6%81%AF%E6%98%AF%E5%90%A6%E4%BC%9A%E4%B8%A2%E5%A4%B1%E5%92%8C%E9%87%8D%E5%A4%8D%E6%B6%88%E8%B4%B9
15.为什么Kafka不支持读写分离？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#15%E4%B8%BA%E4%BB%80%E4%B9%88kafka%E4%B8%8D%E6%94%AF%E6%8C%81%E8%AF%BB%E5%86%99%E5%88%86%E7%A6%BB
16.Kafka中是怎么体现消息顺序性的？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#16kafka%E4%B8%AD%E6%98%AF%E6%80%8E%E4%B9%88%E4%BD%93%E7%8E%B0%E6%B6%88%E6%81%AF%E9%A1%BA%E5%BA%8F%E6%80%A7%E7%9A%84
17.kafka如何实现延迟队列？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#17kafka%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E5%BB%B6%E8%BF%9F%E9%98%9F%E5%88%97
18.什么是消费者组?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#18%E4%BB%80%E4%B9%88%E6%98%AF%E6%B6%88%E8%B4%B9%E8%80%85%E7%BB%84
19.解释下 Kafka 中位移(offset)的作用。	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#19%E8%A7%A3%E9%87%8A%E4%B8%8B-kafka-%E4%B8%AD%E4%BD%8D%E7%A7%BBoffset%E7%9A%84%E4%BD%9C%E7%94%A8
20.阐述下 Kafka 中的领导者副本(Leader Replica)和追随者副本 (Follower Replica)的区别。	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#20%E9%98%90%E8%BF%B0%E4%B8%8B-kafka-%E4%B8%AD%E7%9A%84%E9%A2%86%E5%AF%BC%E8%80%85%E5%89%AF%E6%9C%ACleader-replica%E5%92%8C%E8%BF%BD%E9%9A%8F%E8%80%85%E5%89%AF%E6%9C%AC-follower-replica%E7%9A%84%E5%8C%BA%E5%88%AB
21.如何设置 Kafka 能接收的最大消息的大小?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#21%E5%A6%82%E4%BD%95%E8%AE%BE%E7%BD%AE-kafka-%E8%83%BD%E6%8E%A5%E6%94%B6%E7%9A%84%E6%9C%80%E5%A4%A7%E6%B6%88%E6%81%AF%E7%9A%84%E5%A4%A7%E5%B0%8F
22.监控 Kafka 的框架都有哪些?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#22%E7%9B%91%E6%8E%A7-kafka-%E7%9A%84%E6%A1%86%E6%9E%B6%E9%83%BD%E6%9C%89%E5%93%AA%E4%BA%9B
23.Broker 的 Heap Size 如何设置？	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#23broker-%E7%9A%84-heap-size-%E5%A6%82%E4%BD%95%E8%AE%BE%E7%BD%AE
24.如何估算 Kafka 集群的机器数量?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#24%E5%A6%82%E4%BD%95%E4%BC%B0%E7%AE%97-kafka-%E9%9B%86%E7%BE%A4%E7%9A%84%E6%9C%BA%E5%99%A8%E6%95%B0%E9%87%8F
25.Leader 总是 -1，怎么破?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#25leader-%E6%80%BB%E6%98%AF--1%E6%80%8E%E4%B9%88%E7%A0%B4
26.LEO、LSO、AR、ISR、HW 都表示什么含义?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#26leolsoarisrhw-%E9%83%BD%E8%A1%A8%E7%A4%BA%E4%BB%80%E4%B9%88%E5%90%AB%E4%B9%89
27.Kafka 能手动删除消息吗?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#27kafka-%E8%83%BD%E6%89%8B%E5%8A%A8%E5%88%A0%E9%99%A4%E6%B6%88%E6%81%AF%E5%90%97
28.consumer_offsets 是做什么用的?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#28consumer_offsets-%E6%98%AF%E5%81%9A%E4%BB%80%E4%B9%88%E7%94%A8%E7%9A%84
29.分区 Leader 选举策略有几种?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#29%E5%88%86%E5%8C%BA-leader-%E9%80%89%E4%B8%BE%E7%AD%96%E7%95%A5%E6%9C%89%E5%87%A0%E7%A7%8D
30.Kafka 的哪些场景中使用了零拷贝(Zero Copy)?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#30kafka-%E7%9A%84%E5%93%AA%E4%BA%9B%E5%9C%BA%E6%99%AF%E4%B8%AD%E4%BD%BF%E7%94%A8%E4%BA%86%E9%9B%B6%E6%8B%B7%E8%B4%9Dzero-copy
31.如何调优 Kafka?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#31%E5%A6%82%E4%BD%95%E8%B0%83%E4%BC%98-kafka
32.Controller 发生网络分区(Network Partitioning)时，Kafka 会怎么样?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#32controller-%E5%8F%91%E7%94%9F%E7%BD%91%E7%BB%9C%E5%88%86%E5%8C%BAnetwork-partitioning%E6%97%B6kafka-%E4%BC%9A%E6%80%8E%E4%B9%88%E6%A0%B7
33.Java Consumer 为什么采用单线程来获取消息?	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#33java-consumer-%E4%B8%BA%E4%BB%80%E4%B9%88%E9%87%87%E7%94%A8%E5%8D%95%E7%BA%BF%E7%A8%8B%E6%9D%A5%E8%8E%B7%E5%8F%96%E6%B6%88%E6%81%AF
34.简述 Follower 副本消息同步的完整流程。	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#34%E7%AE%80%E8%BF%B0-follower-%E5%89%AF%E6%9C%AC%E6%B6%88%E6%81%AF%E5%90%8C%E6%AD%A5%E7%9A%84%E5%AE%8C%E6%95%B4%E6%B5%81%E7%A8%8B
参考资料	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#1为什么要使用-kafka为什么要使用消息队列
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#2kafka中的israr又代表什么isr的伸缩又指什么
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#3kafka中的broker-是干什么的
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#4kafka中的-zookeeper-起到什么作用可以不用zookeeper么
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#5kafka-follower如何与leader同步数据
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#6什么情况下一个-broker-会从-isr-中被踢出去
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#7kafka-为什么那么快
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#8kafka-producer如何优化打入速度
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#9kafka-producer-打数据ack--为-0-1--1-的时候代表啥-设置--1-的时候什么情况下leader-会认为一条消息-commit-了
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#10kafka--unclean-配置代表啥会对-spark-streaming-消费有什么影响
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#11如果leader-crash时isr为空怎么办
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#12kafka的message格式是什么样的
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#13kafka中consumer-group-是什么概念
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#14kafka中的消息是否会丢失和重复消费
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#15为什么kafka不支持读写分离
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#16kafka中是怎么体现消息顺序性的
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#17kafka如何实现延迟队列
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#18什么是消费者组
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#19解释下-kafka-中位移offset的作用
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#20阐述下-kafka-中的领导者副本leader-replica和追随者副本-follower-replica的区别
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#21如何设置-kafka-能接收的最大消息的大小
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#22监控-kafka-的框架都有哪些
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#23broker-的-heap-size-如何设置
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#24如何估算-kafka-集群的机器数量
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#25leader-总是--1怎么破
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#26leolsoarisrhw-都表示什么含义
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#27kafka-能手动删除消息吗
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#28consumer_offsets-是做什么用的
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#29分区-leader-选举策略有几种
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#30kafka-的哪些场景中使用了零拷贝zero-copy
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#31如何调优-kafka
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#32controller-发生网络分区network-partitioning时kafka-会怎么样
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#33java-consumer-为什么采用单线程来获取消息
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#34简述-follower-副本消息同步的完整流程
	https://github.com/githubprogramman/JavaInterview/blob/main/Kafka.md#参考资料
https://blog.csdn.net/qq_28900249/article/details/90346599	https://blog.csdn.net/qq_28900249/article/details/90346599
https://www.jianshu.com/p/511962462e58	https://www.jianshu.com/p/511962462e58
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