DolphinScheduler JavaTask动态传参秘籍：轻松实现任务间数据流动
Apache DolphinScheduler的JavaTask可以通过在任务执行日志中输出特定格式的参数来支持OUT参数的下游传输，通过捕捉日志并将其作为参数传递给下游任务。这种机制允许任务间的数据流动和通信，增强了工作流的灵活性和动态性。
那具体要怎么做呢？本文将进行详细的讲解。
0 修改一行源码
org.apache.dolphinscheduler.plugin.task.java.JavaTask
1、针对JAVA类
流程定义图
1.1、javaTaskForClass设置
1.2、taskA设置
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
[INFO] 2024-07-11 21:38:46.121 +0800 - ***********************************************************************************************
[INFO] 2024-07-11 21:38:46.121 +0800 - ********************************* Execute task instance *************************************
[INFO] 2024-07-11 21:38:46.122 +0800 - ***********************************************************************************************
[INFO] 2024-07-11 21:38:46.122 +0800 - Final Shell file is:
[INFO] 2024-07-11 21:38:46.122 +0800 - ****************************** Script Content *****************************************************************
[INFO] 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
[INFO] 2024-07-11 21:38:46.123 +0800 - ****************************** Script Content *****************************************************************
[INFO] 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
[INFO] 2024-07-11 21:38:46.127 +0800 - process start, process id is: 884510
[INFO] 2024-07-11 21:38:48.127 +0800 - ->
123
[INFO] 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:0
2、针对JAR
2.1、jar包封装示例
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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> <!-- Do not copy the signatures in the META-INF folder. Otherwise, this might cause SecurityExceptions when using the JAR. --> <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>
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2.1.2、demo.Demo类具体内容
package demo;
public class Demo {
public static void main(String[] args) { System.out.println("${setValue(output=123)}"); }}
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2.1.3、上传jar到资源中心
mvn clean package，将编译好的java-demo-1.0-SNAPSHOT.jar上传到资源中心，
2.2、流程定义图
2.3、javaTask
2.4、testTask
2.5、testTask内容输出
[INFO] 2024-07-11 21:56:05.324 +0800 - Set taskVarPool: [{"prop":"output","direct":"IN","type":"VARCHAR","value":"123"}] successfully
[INFO] 2024-07-11 21:56:05.324 +0800 - ***********************************************************************************************
[INFO] 2024-07-11 21:56:05.324 +0800 - ********************************* Execute task instance *************************************
[INFO] 2024-07-11 21:56:05.324 +0800 - ***********************************************************************************************
[INFO] 2024-07-11 21:56:05.325 +0800 - Final Shell file is:
[INFO] 2024-07-11 21:56:05.325 +0800 - ****************************** Script Content *****************************************************************
[INFO] 2024-07-11 21:56:05.325 +0800 - #!/bin/bash
BASEDIR=$(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
[INFO] 2024-07-11 21:56:05.325 +0800 - ****************************** Script Content *****************************************************************
[INFO] 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
[INFO] 2024-07-11 21:56:05.329 +0800 - process start, process id is: 885572
[INFO] 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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