flume学习（一）：log4j直接输出日志到flume

log4j.properties配置：

log4j.rootLogger=INFO
log4j.category.com.besttone=INFO,flume
log4j.appender.flume = org.apache.flume.clients.log4jappender.Log4jAppender
log4j.appender.flume.Hostname = localhost
log4j.appender.flume.Port = 44444

log4j.appender.flume.UnsafeMode = true

需要将/opt/cloudera/parcels/CDH-5.0.0-1.cdh5.0.0.p0.47/lib/flume-ng/tools/flume-ng-log4jappender-1.4.0-cdh5.0.0-jar-with-dependencies.jar添加到classpath下。

然后可以写一个简单的测试类来测试一下：

[java]  view plain copy

1. package com.besttone.flume;  
2.   
3. import java.util.Date;  
4.   
5. import org.apache.commons.logging.Log;  
6. import org.apache.commons.logging.LogFactory;  
7.   
8. public class WriteLog {  
9.     protected static final Log logger = LogFactory.getLog(WriteLog.class);  
10.   
11.     /** 
12.      * @param args 
13.      * @throws InterruptedException  
14.      */  
15.     public static void main(String[] args) throws InterruptedException {  
16.         // TODO Auto-generated method stub  
17.         while (true) {  
18.         //每隔两秒log输出一下当前系统时间戳  
19.             logger.info(new Date().getTime());  
20.             Thread.sleep(2000);  
21.         }  
22.     }  
23. }  

然后写一个run.sh脚本运行这个类：

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1. #!/bin/bash  
2. jarlist=`ls ./lib/*.jar`  
3. CLASSPATH=’./bin/’  
4. for jar in ${jarlist}  
5. do  
6.    CLASSPATH=${CLASSPATH}:${jar}  
7. done  
8. echo ${CLASSPATH}  
9.   
10. java -classpath “$CLASSPATH” com.besttone.flume.WriteLog &  

执行run.sh，将sink设置为logger,去flume的日志文件里去看，可以看到log4j的日志输出已经传输到了flume中：

2014-07-16 14:23:54,193 INFO org.apache.flume.sink.LoggerSink: Event: { headers:{flume.client.log4j.log.level=20000, flume.client.log4j.message.encoding=UTF8, flume.client.log4j.logger.name=com.besttone.flume.WriteLog, flume.client.log4j.timestamp=1405491834189} body: 31 34 30 35 34 39 31 38 33 34 31 38 39          1405491834189 }