数据库技术:CDH下配置Flume进行配置传输日志文件（尚硅谷版）

说明：许多企业目前都在使用CDH进行大数据开发，CDH具有方便，高效，一键配置，方便管理和搭建大数据组件的特点，所以下面说一下尚硅谷的Flume配合Kafka进行日志文件的采集。

架构图

下图蓝框内为采集架构图，由架构图得到数据是以Flume –> kafka –> Flume –> HDFS进行采集的，可以看到使用了两次Flume

第一层Flume架构及配置

这一块的source是TAILDIR，channel是memory，sink是kafka，这一块用到了拦截器，拦截器的作用是将日志文件分为两个部分，一个部分就是启动日志start，一个是时间日志event，通过拦截器的筛选则会将日志文件筛选出这两部分存放在kafka的topic，前提要将kafka的topic建立好，topic_start，topic_event，此部分省略
注：flume采用的压缩为LZO，不知道如何让在CDH下配置LZO的请看我的这篇文章：CDH下LZO的配置



问：Flume的代码一定要这样放在CDH中吗
答：当然不是，这样写的好处是CDH启动后就会一直监测日志文件，只要生成日志文件就会进行传输，不这样写，按照普通配置文件也可以使用，flume-ng agent -c conf/ -n a1 -f /配置路径/f1.conf -Dflume.root.logger=DEBUG,consol 拦截器放在/opt/cloudera/parcels/CDH/lib/flume-ng/lib/

拦截器代码如下，jar包下载链接在下，可以配合Flume直接用

拦截器代码

本项目中自定义了两个拦截器，分别是：ETL拦截器、日志类型区分拦截器。
ETL拦截器主要用于，过滤时间戳不合法和Json数据不完整的日志
日志类型区分拦截器主要用于，将启动日志和事件日志区分开来，方便发往Kafka的不同Topic。
1）创建Maven工程flume-interceptor
2）创建包名：com.atguigu.flume.interceptor
3）在pom.xml文件中添加如下配置

<dependencies>     <dependency>         <groupId>org.apache.flume</groupId>         <artifactId>flume-ng-core</artifactId>         <version>1.7.0</version>     </dependency> </dependencies>  <build>     <plugins>         <plugin>             <artifactId>maven-compiler-plugin</artifactId>             <version>2.3.2</version>             <configuration>                 <source>1.8</source>                 <target>1.8</target>             </configuration>         </plugin>         <plugin>             <artifactId>maven-assembly-plugin</artifactId>             <configuration>                 <descriptorRefs>                     <descriptorRef>jar-with-dependencies</descriptorRef>                 </descriptorRefs>             </configuration>             <executions>                 <execution>                     <id>make-assembly</id>                     <phase>package</phase>                     <goals>                         <goal>single</goal>                     </goals>                 </execution>             </executions>         </plugin>     </plugins> </build> 

4）在com.atguigu.flume.interceptor包下创建LogETLInterceptor类名
Flume ETL拦截器LogETLInterceptor

package com.atguigu.flume.interceptor;  import org.apache.flume.Context; import org.apache.flume.Event; import org.apache.flume.interceptor.Interceptor;  import java.nio.charset.Charset; import java.util.ArrayList; import java.util.List;  public class LogETLInterceptor implements Interceptor {      @Override     public void initialize() {      }      @Override     public Event intercept(Event event) {          // 1 获取数据         byte[] body = event.getBody();         String log = new String(body, Charset.forName("UTF-8"));          // 2 判断数据类型并向Header中赋值         if (log.contains("start")) {             if (LogUtils.validateStart(log)){                 return event;             }         }else {             if (LogUtils.validateEvent(log)){                 return event;             }         }          // 3 返回校验结果         return null;     }      @Override     public List<Event> intercept(List<Event> events) {          ArrayList<Event> interceptors = new ArrayList<>();          for (Event event : events) {             Event intercept1 = intercept(event);              if (intercept1 != null){                 interceptors.add(intercept1);             }         }          return interceptors;     }      @Override     public void close() {      }      public static class Builder implements Interceptor.Builder{          @Override         public Interceptor build() {             return new LogETLInterceptor();         }          @Override         public void configure(Context context) {          }     } } 

4）Flume日志过滤工具类

package com.atguigu.flume.interceptor; import org.apache.commons.lang.math.NumberUtils;  public class LogUtils {      public static boolean validateEvent(String log) {         // 服务器时间 | json         // 1549696569054 | {"cm":{"ln":"-89.2","sv":"V2.0.4","os":"8.2.0","g":"M67B4QYU@gmail.com","nw":"4G","l":"en","vc":"18","hw":"1080*1920","ar":"MX","uid":"u8678","t":"1549679122062","la":"-27.4","md":"sumsung-12","vn":"1.1.3","ba":"Sumsung","sr":"Y"},"ap":"weather","et":[]}          // 1 切割         String[] logContents = log.split("\|");          // 2 校验         if(logContents.length != 2){             return false;         }          //3 校验服务器时间         if (logContents[0].length()!=13 || !NumberUtils.isDigits(logContents[0])){             return false;         }          // 4 校验json         if (!logContents[1].trim().startsWith("{") || !logContents[1].trim().endsWith("}")){             return false;         }          return true;     }      public static boolean validateStart(String log) {          if (log == null){             return false;         }          // 校验json         if (!log.trim().startsWith("{") || !log.trim().endsWith("}")){             return false;         }          return true;     } } 

5）Flume日志类型区分拦截器LogTypeInterceptor

package com.atguigu.flume.interceptor;  import org.apache.flume.Context; import org.apache.flume.Event; import org.apache.flume.interceptor.Interceptor;  import java.nio.charset.Charset; import java.util.ArrayList; import java.util.List; import java.util.Map;  public class LogTypeInterceptor implements Interceptor {     @Override     public void initialize() {      }      @Override     public Event intercept(Event event) {          // 区分日志类型：   body  header         // 1 获取body数据         byte[] body = event.getBody();         String log = new String(body, Charset.forName("UTF-8"));          // 2 获取header         Map<String, String> headers = event.getHeaders();          // 3 判断数据类型并向Header中赋值         if (log.contains("start")) {             headers.put("topic","topic_start");         }else {             headers.put("topic","topic_event");         }          return event;     }      @Override     public List<Event> intercept(List<Event> events) {          ArrayList<Event> interceptors = new ArrayList<>();          for (Event event : events) {             Event intercept1 = intercept(event);              interceptors.add(intercept1);         }          return interceptors;     }      @Override     public void close() {      }      public static class Builder implements  Interceptor.Builder{          @Override         public Interceptor build() {             return new LogTypeInterceptor();         }          @Override         public void configure(Context context) {          }     } } 

6）jar包链接 提取码：6wz8

Flume1代码

a1.sources=r1 a1.channels=c1 c2  a1.sinks=k1 k2   # configure source a1.sources.r1.type = TAILDIR a1.sources.r1.filegroups = f1 a1.sources.r1.filegroups.f1 = /tmp/logs/app.+ a1.sources.r1.fileHeader = true a1.sources.r1.channels = c1 c2  #interceptor a1.sources.r1.interceptors = i1 i2 a1.sources.r1.interceptors.i1.type = com.atguigu.flume.interceptor.LogETLInterceptor$Builder a1.sources.r1.interceptors.i2.type = com.atguigu.flume.interceptor.LogTypeInterceptor$Builder  # selector a1.sources.r1.selector.type = multiplexing a1.sources.r1.selector.header = topic a1.sources.r1.selector.mapping.topic_start = c1 a1.sources.r1.selector.mapping.topic_event = c2  # configure channel a1.channels.c1.type = memory a1.channels.c1.capacity=10000 a1.channels.c1.byteCapacityBufferPercentage=20  a1.channels.c2.type = memory a1.channels.c2.capacity=10000 a1.channels.c2.byteCapacityBufferPercentage=20  # configure sink # start-sink a1.sinks.k1.type = org.apache.flume.sink.kafka.KafkaSink a1.sinks.k1.kafka.topic = topic_start a1.sinks.k1.kafka.bootstrap.servers = hadoop102:9092,hadoop103:9092,hadoop104:9092 a1.sinks.k1.kafka.flumeBatchSize = 2000 a1.sinks.k1.kafka.producer.acks = 1 a1.sinks.k1.channel = c1  # event-sink a1.sinks.k2.type = org.apache.flume.sink.kafka.KafkaSink a1.sinks.k2.kafka.topic = topic_event a1.sinks.k2.kafka.bootstrap.servers = hadoop102:9092,hadoop103:9092,hadoop104:9092 a1.sinks.k2.kafka.flumeBatchSize = 2000 a1.sinks.k2.kafka.producer.acks = 1 a1.sinks.k2.channel = c2 

Flume2代码（放在第二个flume的节点上）

Flume2架构图

## 组件 a1.sources=r1 r2 a1.channels=c1 c2 a1.sinks=k1 k2  ## source1 a1.sources.r1.type = org.apache.flume.source.kafka.KafkaSource a1.sources.r1.batchSize = 5000 a1.sources.r1.batchDurationMillis = 2000 a1.sources.r1.kafka.bootstrap.servers = hadoop102:9092,hadoop103:9092,hadoop104:9092 a1.sources.r1.kafka.topics=topic_start  ## source2 a1.sources.r2.type = org.apache.flume.source.kafka.KafkaSource a1.sources.r2.batchSize = 5000 a1.sources.r2.batchDurationMillis = 2000 a1.sources.r2.kafka.bootstrap.servers = hadoop102:9092,hadoop103:9092,hadoop104:9092 a1.sources.r2.kafka.topics=topic_event  ## channel1 a1.channels.c1.type=memory a1.channels.c1.capacity=100000 a1.channels.c1.transactionCapacity=10000  ## channel2 a1.channels.c2.type=memory a1.channels.c2.capacity=100000 a1.channels.c2.transactionCapacity=10000  ## sink1 a1.sinks.k1.type = hdfs a1.sinks.k1.hdfs.proxyUser=hive a1.sinks.k1.hdfs.path = /origin_data/gmall/log/topic_start/%Y-%m-%d a1.sinks.k1.hdfs.filePrefix = logstart- a1.sinks.k1.hdfs.round = true a1.sinks.k1.hdfs.roundValue = 10 a1.sinks.k1.hdfs.roundUnit = second  ##sink2 a1.sinks.k2.type = hdfs a1.sinks.k2.hdfs.proxyUser=hive a1.sinks.k2.hdfs.path = /origin_data/gmall/log/topic_event/%Y-%m-%d a1.sinks.k2.hdfs.filePrefix = logevent- a1.sinks.k2.hdfs.round = true a1.sinks.k2.hdfs.roundValue = 10 a1.sinks.k2.hdfs.roundUnit = second  ## 不要产生大量小文件 a1.sinks.k1.hdfs.rollInterval = 10 a1.sinks.k1.hdfs.rollSize = 134217728 a1.sinks.k1.hdfs.rollCount = 0  a1.sinks.k2.hdfs.rollInterval = 10 a1.sinks.k2.hdfs.rollSize = 134217728 a1.sinks.k2.hdfs.rollCount = 0  ## 控制输出文件是原生文件。 a1.sinks.k1.hdfs.fileType = CompressedStream  a1.sinks.k2.hdfs.fileType = CompressedStream   a1.sinks.k1.hdfs.codeC = lzop a1.sinks.k2.hdfs.codeC = lzop  ## 拼装 a1.sources.r1.channels = c1 a1.sinks.k1.channel= c1  a1.sources.r2.channels = c2 a1.sinks.k2.channel= c2 

在HDFS上进行文件创建：

udo -u hdfs hadoop fs -mkdir /origin_data sudo -u hdfs hadoop fs -chown hive:hive /origin_data 

体贴的我还给你们把日志生成jar包提供了，点个赞可以不~
链接：https://pan.baidu.com/s/1Lf7KTF6tvGmmZdr0Hbfv6w
提取码：jjgu
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重启Flume，然后再生成日志文件就可以看到文件出现了，注意修改你的ip地址就可以了

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