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flume拦截器

news 2025/8/6 11:23:03

flume拦截器代码

1.依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>flume-interceptor</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.apache.flume</groupId><artifactId>flume-ng-core</artifactId><version>1.9.0</version><scope>provided</scope></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.62</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></project>

2.核心代码

package com.atguigu.gmall.flume.log.interceptor;import com.alibaba.fastjson.JSONObject;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.interceptor.Interceptor;import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;public class TimestampAndTableNameInterceptor implements Interceptor {@Overridepublic void initialize() {}@Overridepublic Event intercept(Event event) {Map<String, String> headers = event.getHeaders();
String log = new String(event.getBody(), StandardCharsets.UTF_8);JSONObject jsonObject = JSONObject.parseObject(log);Long ts = jsonObject.getLong("ts");//Maxwell输出的数据中的ts字段时间戳单位为秒，Flume HDFSSink要求单位为毫秒String timeMills = String.valueOf(ts * 1000);String tableName = jsonObject.getString("table");String databaseName = jsonObject.getString("database");headers.put("timestamp", timeMills);headers.put("tableName", tableName);headers.put("databaseName", databaseName);return event;}@Overridepublic List<Event> intercept(List<Event> events) {for (Event event : events) {intercept(event);}return events;}@Overridepublic void close() {}public static class Builder implements Interceptor.Builder {@Overridepublic Interceptor build() {return new TimestampAndTableNameInterceptor ();}@Overridepublic void configure(Context context) {}}
}