DolphinScheduler JavaTask动态传参秘笈：轻松实现使命间数据流动
Apache DolphinScheduler的JavaTask可以通过在使命执行日记中输出特定格式的参数来支持OUT参数的下游传输，通过捕获日记并将其作为参数传递给下游使命。这种机制允许使命间的数据流动和通信，增强了工作流的灵活性和动态性。那详细要怎么做呢？本文将举行详细的讲解。
0 修改一行源码
org.apache.dolphinscheduler.plugin.task.java.JavaTaskhttp://openwrite-whaleops.oss-cn-zhangjiakou.aliyuncs.com/31504_67620C9D333C4FBF8C8358224F86048A
1、针对JAVA类
流程定义图
http://openwrite-whaleops.oss-cn-zhangjiakou.aliyuncs.com/31504_20708BCE5F4B4A198CA4086EDC282BDE
1.1、javaTaskForClass设置
http://openwrite-whaleops.oss-cn-zhangjiakou.aliyuncs.com/31504_1E6A5F4ECDBF45E7902C910C18FC4766
1.2、taskA设置
http://openwrite-whaleops.oss-cn-zhangjiakou.aliyuncs.com/31504_73AC7C5CFFC243FC982F4BF06B87C858
1.3、taskA输出
INFO] 2024-07-11 21:38:46.121 +0800 - Set taskVarPool: [{"prop":"output","direct":"IN","type":"VARCHAR","value":"123"}] successfully
2024-07-11 21:38:46.121 +0800 - ***********************************************************************************************
2024-07-11 21:38:46.121 +0800 - *********************************Execute task instance*************************************
2024-07-11 21:38:46.122 +0800 - ***********************************************************************************************
2024-07-11 21:38:46.122 +0800 - Final Shell file is:
2024-07-11 21:38:46.122 +0800 - ****************************** Script Content *****************************************************************
2024-07-11 21:38:46.122 +0800 - #!/bin/bash
BASEDIR=$(cd `dirname $0`; pwd)
cd $BASEDIR
source /etc/profile
export HADOOP_HOME=${HADOOP_HOME:-/home/hadoop-3.3.1}
export HADOOP_CONF_DIR=${HADOOP_CONF_DIR:-/opt/soft/hadoop/etc/hadoop}
export SPARK_HOME=${SPARK_HOME:-/home/spark-3.2.1-bin-hadoop3.2}
export PYTHON_HOME=${PYTHON_HOME:-/opt/soft/python}
export HIVE_HOME=${HIVE_HOME:-/home/hive-3.1.2}
export FLINK_HOME=/home/flink-1.18.1
export DATAX_HOME=${DATAX_HOME:-/opt/soft/datax}
export SEATUNNEL_HOME=/opt/software/seatunnel
export CHUNJUN_HOME=${CHUNJUN_HOME:-/opt/soft/chunjun}
export PATH=$HADOOP_HOME/bin:$SPARK_HOME/bin:$PYTHON_HOME/bin:$JAVA_HOME/bin:$HIVE_HOME/bin:$FLINK_HOME/bin:$DATAX_HOME/bin:$SEATUNNEL_HOME/bin:$CHUNJUN_HOME/bin:$PATH
echo 123
2024-07-11 21:38:46.123 +0800 - ****************************** Script Content *****************************************************************
2024-07-11 21:38:46.123 +0800 - Executing shell command : sudo -u root -i /tmp/dolphinscheduler/exec/process/root/13850571680800/14237629094560_9/2095/1689/2095_1689.sh
2024-07-11 21:38:46.127 +0800 - process start, process id is: 884510
2024-07-11 21:38:48.127 +0800 -->
123
2024-07-11 21:38:48.128 +0800 - process has exited. execute path:/tmp/dolphinscheduler/exec/process/root/13850571680800/14237629094560_9/2095/1689, processId:884510 ,exitStatusCode:0 ,processWaitForStatus:true ,processExitValue:02、针对JAR
2.1、jar包封装示例
[*]2.1.1、pom.xml
<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>demo</groupId>
<artifactId>java-demo</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>java-demo</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.4</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<excludes>
<exclude>com.google.code.findbugs:jsr305</exclude>
<exclude>org.slf4j:*</exclude>
<exclude>log4j:*</exclude>
<exclude>org.apache.hadoop:*</exclude>
</excludes>
</artifactSet>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
<transformers combine.children="append">
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>demo.Demo</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
[*]2.1.2、demo.Demo类详细内容
package demo;
public class Demo {
public static void main(String[] args) {
System.out.println("${setValue(output=123)}");
}
}
[*]2.1.3、上传jar到资源中央
mvn clean package，将编译好的java-demo-1.0-SNAPSHOT.jar上传到资源中央，
2.2、流程定义图
http://openwrite-whaleops.oss-cn-zhangjiakou.aliyuncs.com/31504_EAF2E5862FC149ECAC7865CE4EE264AD
2.3、javaTask
http://openwrite-whaleops.oss-cn-zhangjiakou.aliyuncs.com/31504_CFD94B7D787D478FA0389D799D0D0309
2.4、testTask
http://openwrite-whaleops.oss-cn-zhangjiakou.aliyuncs.com/31504_10B4C4A206DE448A93B9E05965F91368
2.5、testTask内容输出
2024-07-11 21:56:05.324 +0800 - Set taskVarPool: [{"prop":"output","direct":"IN","type":"VARCHAR","value":"123"}] successfully
2024-07-11 21:56:05.324 +0800 - ***********************************************************************************************
2024-07-11 21:56:05.324 +0800 - *********************************Execute task instance*************************************
2024-07-11 21:56:05.324 +0800 - ***********************************************************************************************
2024-07-11 21:56:05.325 +0800 - Final Shell file is:
2024-07-11 21:56:05.325 +0800 - ****************************** Script Content *****************************************************************
2024-07-11 21:56:05.325 +0800 - #!/bin/bash
BASEDIR=$(cd `dirname $0`; pwd)
cd $BASEDIR
source /etc/profile
export HADOOP_HOME=${HADOOP_HOME:-/home/hadoop-3.3.1}
export HADOOP_CONF_DIR=${HADOOP_CONF_DIR:-/opt/soft/hadoop/etc/hadoop}
export SPARK_HOME=${SPARK_HOME:-/home/spark-3.2.1-bin-hadoop3.2}
export PYTHON_HOME=${PYTHON_HOME:-/opt/soft/python}
export HIVE_HOME=${HIVE_HOME:-/home/hive-3.1.2}
export FLINK_HOME=/home/flink-1.18.1
export DATAX_HOME=${DATAX_HOME:-/opt/soft/datax}
export SEATUNNEL_HOME=/opt/software/seatunnel
export CHUNJUN_HOME=${CHUNJUN_HOME:-/opt/soft/chunjun}
export PATH=$HADOOP_HOME/bin:$SPARK_HOME/bin:$PYTHON_HOME/bin:$JAVA_HOME/bin:$HIVE_HOME/bin:$FLINK_HOME/bin:$DATAX_HOME/bin:$SEATUNNEL_HOME/bin:$CHUNJUN_HOME/bin:$PATH
echo 123
2024-07-11 21:56:05.325 +0800 - ****************************** Script Content *****************************************************************
2024-07-11 21:56:05.325 +0800 - Executing shell command : sudo -u root -i /tmp/dolphinscheduler/exec/process/root/13850571680800/14243296570784_1/2096/1691/2096_1691.sh
2024-07-11 21:56:05.329 +0800 - process start, process id is: 885572
2024-07-11 21:56:07.329 +0800 -转载自Journey
原文链接：https://segmentfault.com/a/1190000045054384
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