Flume Source
一、概述
1.Flume是Apache提供的开源的、分布式的、可靠的日志收集系统
2.能够有效的收集、聚合、传输大量的日志数据
3.flume有2个版本:flume-og(flume09x)和flume-ng(flume1.x),flume-og和flume-ng不兼容
4.flume中的事务是强一致性的
二、基本概念
1.Event:将收集到的每一条日志都封装成一个Event对象 - 在Flume中流动的是Event,Event的格式采用了json格式来定义的,这个json串中包含了2个部分:headers和body
2.Flume中的组件是以Agent形式出现的,Agent包含:Source,Channel,Sink
a.Source:从源头采集数据
b.Channel:临时存储数据
c.Sink:将数据发往目的地
在flume的安装目录下,创建文件夹data
netcat source:
在data中创建一个文件basic.conf,内容如下
#给Agent起名为a1
#给source起名
a1.sources = s1
#给channel起名
a1.channels = c1
#给sink起名
a1.sinks = k1
#配置source
#配置source的类型
a1.sources.s1.type = netcat
#配置监听的主机
a1.sources.s1.bind = 0.0.0.0
#配置监听的端口
a1.sources.s1.port = 8090
#配置channel
#配置channel的类型
a1.channels.c1.type = memory
#配置channel的容量,多少条
a1.channels.c1.capacity = 10000
#配置往sink发送的数据量,每次1000条的量发送
al.channels.c1.transactionCapacity = 1000
#配置sink
#配置sink的类型
a1.sinks.k1.type = logger
#将source和channel绑定,一个source有多个channel
a1.sources.s1.channels = c1
#将sink和channel绑定,一个sink只有一个channel
a1.sinks.k1.channel = c1
执行命令:-n agent的名称,-c conf目录,-f 自定义的文件,-Dflume.root.logger 日志输出基本和位置
./flume-ng agent -n a1 -c ../conf/ -f ../data/basic.conf -Dflume.root.logger=INFO,console
另起一个ssh窗口,执行命令:nc hadoop101 8090,在控制台中输入数据,并回车
AVRO:avrosource.conf
a1.sources = s1
a1.channels = c1
a1.sinks = k1
a1.sources.s1.type = avro
a1.sources.s1.bind = 0.0.0.0
a1.sources.s1.port = 8090
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100
a1.sinks.k1.type = logger
a1.sources.s1.channels = c1
a1.sinks.k1.channel = c1
bin目录下执行命令:./flume-ng agent -n a1 -c ../conf/ -f ../data/avrosource.conf -Dflume.root.logger=INFO,console 启动flume
执行agent-avro客户端指令,在flume的安装目录的bin目录下:a.txt是需要进行操作的文件,必须存在
./flume-ng avro-client -H 0.0.0.0 -p 8090 -F /home/a.txt -c ../conf/
Exec Source:execsource.conof
a1.sources=r1
a1.channels=c1
a1.sinks=s1
a1.sources.r1.type=exec
a1.sources.r1.command=cat /home/a.txt
a1.channels.c1.type=memory
a1.channels.c1.capacity=1000
a1.channels.c1.transactionCapacity=100
a1.sinks.s1.type=logger
a1.sources.r1.channels=c1
a1.sinks.s1.channel=c1
bin目录下执行命令:./flume-ng agent -n a1 -c ../conf/ -f ../data/execsource.conf -Dflume.root.logger=INFO,console
看到日志中 cat /home/a.txt 命令下有两条结果输出
Spooling Directory:监听目录下有文件的变化,spooldirsource.txt配置文件
在 /home下创建 flumedata目录
spooldirsource.txt文件: flume安装目录/data/spooldirsource.txt,内容如下
a1.sources=r1
a1.channels=c1
a1.sinks=s1
a1.sources.r1.type=spooldir
a1.sources.r1.spoolDir=/home/flumedata
a1.channels.c1.type=memory
a1.channels.c1.capacity=1000
a1.channels.c1.transactionCapacity=100
a1.sinks.s1.type=logger
a1.sources.r1.channels=c1
a1.sinks.s1.channel=c1
bin目录下执行命令:./flume-ng agent -n a1 -c ../conf/ -f ../data/spooldirsource.txt -Dflume.root.logger=INFO,console
在 /home目录下创建一个文件a.log,随意在a.log中写入内容
执行命令:mv a.log /home/flumedata ,在flumedata目录下会有 a.log.COMPLETED 文件
Sequence Generator Source --序列发生源
seqsource.conf 配置文件内容:
a1.sources=r1
a1.channels=c1
a1.sinks=s1
a1.sources.r1.type=seq
a1.channels.c1.type=memory
a1.channels.c1.capacity=1000
a1.channels.c1.transactionCapacity=100
a1.sinks.s1.type=logger
a1.sources.r1.channels=c1
a1.sinks.s1.channel=c1
启动命令:./flume-ng agent -n a1 -c ../conf/ -f ../data/seqsource.conf -Dflume.root.logger=INFO,console
Http source:httpsource.conf
a1.sources = s1
a1.channels = c1
a1.sinks = k1
a1.sources.s1.type = http
a1.sources.s1.port = 8090
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100
a1.sinks.k1.type = logger
a1.sources.s1.channels = c1
a1.sinks.k1.channel = c1
bin目录下执行命令:./flume-ng agent -n a1 -c ../conf/ -f ../data/httpsource.conf -Dflume.root.logger=INFO,console
新打开一个ssh窗口,发送http POST 请求:
curl -X POST -d '[{"headers":{"a":"a1","b":"b1"},"body":"hello http-flume"}]' http://0.0.0.0:8090
三、自定义Source
1.如果Flume中提供的Source不符合当前场景,需要自定义Source。如果在Flume中自定义Source,
那么需要确定Source的数据获取方式:PollableSource(主动拉取数据), EventDrivenSource(事件驱动方式)
authsource.conf如下:
a1.sources = s1
a1.channels = c1
a1.sinks = k1
a1.sources.s1.type = com.apple.flume.AuthSource ##自定义的类全路径名称
a1.sources.s1.file = /home/person.log ##source数据,自定义数据来源文件
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100
a1.sinks.k1.type = logger
a1.sources.s1.channels = c1
a1.sinks.k1.channel = c1
com.apple.flume.AuthSource类如下:
package com.apple.flume;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.EventDrivenSource;
import org.apache.flume.Source;
import org.apache.flume.channel.ChannelProcessor;
import org.apache.flume.conf.Configurable;
import org.apache.flume.event.EventBuilder;
import org.apache.flume.source.AbstractSource;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* Flume 自定义Source
*
* @author apple
* @date 2020/06/29
*/
public class AuthSource extends AbstractSource implements Configurable, Source, EventDrivenSource {
private String path;
private ExecutorService es;
/**
* 获取配置文件中的属性
*
* @param context
*/
@Override
public void configure(Context context) {
path = context.getString("file");//对应authsouorce.conf文件中的 a1.sources.s1.file,如果改为a1.sources.s1.path,则代码需要修改为path
}
/**
* 启动Source
*/
@Override
public synchronized void start() {
//获取Channel
ChannelProcessor cp = this.getChannelProcessor();
es = Executors.newFixedThreadPool(10);
try {
es.submit(new FileThread(path, cp));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
class FileThread implements Runnable {
private BufferedReader br;
private ChannelProcessor cp;
public FileThread(String path, ChannelProcessor cp) throws FileNotFoundException {
this.cp = cp;
File file = new File(path);
if (file.isFile()) {
br = new BufferedReader(new FileReader(path));
}
}
@Override
public void run() {
while (true) {
try {
//读数据
String name = br.readLine();
if (name == null) {
break;
}
String age = br.readLine();
String description = br.readLine();
Map<String, String> headers = new HashMap<>();
headers.put("name", name);
headers.put("age", age);
//创建一个Event对象
Event e = EventBuilder.withBody(description.getBytes(), headers);
//将event放到通道中
cp.processEvent(e);
} catch (IOException e) {
e.printStackTrace();
}
}
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
将 com.apple.flume.AuthSource类 打为jar包上传到flume安装目录下的lib包下
bin目录下执行:./flume-ng agent -n a1 -c ../conf/ -f ../data/authsource.conf -Dflume.root.logger=INFO,console