From b098ac47f78581e4efcb4d9c85be3a9113938995 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Tue, 30 Jul 2024 00:50:22 +0800
Subject: [PATCH] kafka introduction and tailf practice

---
 go.mod                   |  4 ++++
 go.sum                   |  8 ++++++++
 kafka/kafka.log          | 28 ++++++++++++++++++++++++++++
 kafka/logAgent.log       |  3 +++
 kafka/tailf_demo/main.go | 36 ++++++++++++++++++++++++++++++++++++
 my.log                   |  4 ++++
 6 files changed, 83 insertions(+)
 create mode 100644 kafka/kafka.log
 create mode 100644 kafka/logAgent.log
 create mode 100644 kafka/tailf_demo/main.go
 create mode 100644 my.log

diff --git a/go.mod b/go.mod
index 939139e..4cfd44a 100644
--- a/go.mod
+++ b/go.mod
@@ -7,6 +7,10 @@ require (
 	github.com/go-redis/redis v6.15.9+incompatible // indirect
 	github.com/go-sql-driver/mysql v1.8.1 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
+	github.com/hpcloud/tail v1.0.0 // indirect
 	github.com/jmoiron/sqlx v1.4.0 // indirect
 	github.com/nsqio/go-nsq v1.1.0 // indirect
+	golang.org/x/sys v0.22.0 // indirect
+	gopkg.in/fsnotify.v1 v1.4.7 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 )
diff --git a/go.sum b/go.sum
index 4a55919..a982c86 100644
--- a/go.sum
+++ b/go.sum
@@ -7,9 +7,17 @@ github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqw
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
 github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/jmoiron/sqlx v1.4.0 h1:1PLqN7S1UYp5t4SrVVnt4nUVNemrDAtxlulVe+Qgm3o=
 github.com/jmoiron/sqlx v1.4.0/go.mod h1:ZrZ7UsYB/weZdl2Bxg6jCRO9c3YHl8r3ahlKmRT4JLY=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
 github.com/nsqio/go-nsq v1.1.0 h1:PQg+xxiUjA7V+TLdXw7nVrJ5Jbl3sN86EhGCQj4+FYE=
 github.com/nsqio/go-nsq v1.1.0/go.mod h1:vKq36oyeVXgsS5Q8YEO7WghqidAVXQlcFxzQbQTuDEY=
+golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
+golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
diff --git a/kafka/kafka.log b/kafka/kafka.log
new file mode 100644
index 0000000..29cb74b
--- /dev/null
+++ b/kafka/kafka.log
@@ -0,0 +1,28 @@
+1.kafka集群的架构
+ 1.broker
+ 2.topic
+ 3.partition：分区，把同一个topic分成不同的分区，提高负载
+   1.leader 分区的主节点
+   2.follower 分区的从节点
+ 4.consumer group
+2. 生产者往kafka发送数据的流程（6步）
+  1.生产者从kafka集群中获取分区leader的信息
+  2.发送数据到leader
+  3.leader数据落盘
+  4.follower从leader拉取消息数据
+  5.follower将消息写入本地磁盘后将ACK发给leader
+  6.leader收到所有的follower的ACK之后向生产者发送ACK
+
+3.kafka选择分区的模式（3种）
+  1.指定往那个分区写
+  2.指定key,kafka根据key做hash，然后决定写哪个分区
+  3.既没指定分区，又没指定key，轮询分区
+4.生产者往kakfa发送数据的模式
+ 1. 0：把数据发给leader就算成功，效率最高，但安全性低
+ 2. 1：把数据发送给leader，等待leader回ACK
+ 3. all: 把数据发给leader，确保follower从leader拉取数据回复ACK给leader，leader再回复生产者ack；安全性最高
+
+5.分区存储文件的原理
+6.为什么kafka快
+7.消费数据的原理
+
diff --git a/kafka/logAgent.log b/kafka/logAgent.log
new file mode 100644
index 0000000..8e70732
--- /dev/null
+++ b/kafka/logAgent.log
@@ -0,0 +1,3 @@
+logAgent的工作流程：
+1.读日志 -- tailf 第三方库
+2.往kafka里写日志
\ No newline at end of file
diff --git a/kafka/tailf_demo/main.go b/kafka/tailf_demo/main.go
new file mode 100644
index 0000000..bc42ff3
--- /dev/null
+++ b/kafka/tailf_demo/main.go
@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"github.com/hpcloud/tail"
+	"time"
+)
+
+// tail 示例
+func main() {
+	fileName := "./my.log"
+	config := tail.Config{
+		Location:  &tail.SeekInfo{Offset: 0, Whence: 2}, //从文件的哪个地方开始读 filebeat记录了文件断点的位置
+		ReOpen:    true,                                 //重新打开，切分用
+		MustExist: false,                                //文件不存在不报错
+		Poll:      true,
+		Follow:    true, //是否跟随
+	}
+	tails, err := tail.TailFile(fileName, config)
+	if err != nil {
+		fmt.Printf("tail file error:%s\n", err)
+	}
+	var (
+		line *tail.Line
+		ok   bool
+	)
+	for {
+		line, ok = <-tails.Lines
+		if !ok {
+			fmt.Printf("tail file closed reopen,file name:%s\n", tails.Filename)
+			time.Sleep(1 * time.Second)
+			continue
+		}
+		fmt.Println("msg:", line.Text)
+	}
+}
diff --git a/my.log b/my.log
new file mode 100644
index 0000000..97cf2f5
--- /dev/null
+++ b/my.log
@@ -0,0 +1,4 @@
+I want to freedom
+my name is wangao
+hello
+wasai
\ No newline at end of file