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DolphinScheduler JavaTask动态传参秘籍：轻松实现任务间数据流动

日期：2024-11-26点击：205

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

file

1、针对JAVA类

流程定义图

file

1.1、javaTaskForClass设置

file

1.2、taskA设置

file

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

  • 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>

  • 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)}");
  }

    }

  • 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

file

2.3、javaTask

file

2.4、testTask

file

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

本文由 白鲸开源科技 提供发布支持！

原文链接：https://my.oschina.net/dailidong/blog/16535816
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