DolphinScheduler JavaTask動態傳參秘籍：輕鬆實現任務間資料流動

海豚调度發表於2024-11-26
Java

Apache DolphinScheduler的JavaTask可以透過在任務執行日誌中輸出特定格式的引數來支援OUT引數的下游傳輸，透過捕捉日誌並將其作為引數傳遞給下游任務。這種機制允許任務間的資料流動和通訊，增強了工作流的靈活性和動態性。

那具體要怎麼做呢？本文將進行詳細的講解。

0 修改一行原始碼

org.apache.dolphinscheduler.plugin.task.java.JavaTask

file

1、針對JAVA類

流程定義圖

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1.1、javaTaskForClass設定

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1.2、taskA設定

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1.3、taskA輸出

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、針對JAR

2.1、jar包封裝示例

  • 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類具體內容
package demo;

public class Demo {

    public static void main(String[] args) {
        System.out.println("${setValue(output=123)}");
    }
}
  • 2.1.3、上傳jar到資源中心

mvn clean package，將編譯好的java-demo-1.0-SNAPSHOT.jar上傳到資源中心，

2.2、流程定義圖

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2.3、javaTask

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2.4、testTask

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2.5、testTask內容輸出

[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 -

轉載自Journey
原文連結：https://segmentfault.com/a/1190000045054384

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