Question

我正在尝试在Google Cloud Dataflow上运行一个管道，我可以使用DirectRunner成功运行该管道。当我执行这个Maven命令时：

mvn compile exec:java \
    -Dexec.mainClass=com.example.Pipeline \
    -Dexec.args="--project=project-name \
    --stagingLocation=gs://bucket-name/staging/ \
    ... custom arguments ...
    --runner=DataflowRunner"

我收到以下错误：

No Runner was specified and the DirectRunner was not found on the classpath.
[ERROR] Specify a runner by either:
[ERROR]     Explicitly specifying a runner by providing the 'runner' property
[ERROR]     Adding the DirectRunner to the classpath
[ERROR]     Calling 'PipelineOptions.setRunner(PipelineRunner)' directly

我故意从DirectRunner删除了pom.xml并添加了此内容：

<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-runners-google-cloud-dataflow-java</artifactId>
    <version>2.0.0</version>
    <scope>runtime</scope>
</dependency>

我继续删除<scope>标记，然后调用options.setRunner(DataflowRunner.class)，但它没有帮助。从PipelineOptions扩展我自己的DataflowPipelineOptions界面也没有解决问题。

看起来它以我无法调试的方式忽略runner选项。

更新：以下是完整的pom.xml，如果有帮助：

<?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>com.example</groupId>
    <artifactId>dataflow</artifactId>
    <version>0.1</version>

    <dependencies>
        <dependency>
            <groupId>org.apache.beam</groupId>
            <artifactId>beam-sdks-java-core</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.beam</groupId>
            <artifactId>beam-runners-google-cloud-dataflow-java</artifactId>
            <version>2.0.0</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.beam</groupId>
            <artifactId>beam-sdks-java-io-jdbc</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.beam</groupId>
            <artifactId>beam-sdks-java-io-google-cloud-platform</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.1.4.jre7</version>
        </dependency>
    </dependencies>
</project>

Answer 1

忘记将我的PipelineOptions实例作为参数传递给Pipeline.create()方法是造成我问题的原因。

PipelineOptionsFactory.register(MyOptions.class);
MyOptions options = PipelineOptionsFactory.fromArgs(args).withValidation().as(MyOptions.class);
Pipeline pipeline = Pipeline.create(options); // Don't forget the options argument.
...
pipeline.run();

Answer 2

您使用的是哪个Dataflow SDK版本？

如果您使用的是Dataflow 2.X，则可以使用DirectRunner

在Dataflow 1.X中，您可以使用DirectPipelineRunner

您还可以看到Getting started instructions here建议DataflowRunner和BlockingDataflowRunner（取决于您的版本）。如果可以的话，我建议先试着让它先工作。

Apache Beam：找不到DataflowRunner

2 个答案: