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google-cloud-dataflow - 无法使用 Dataflow REST API 传递作业参数

问题描述

我正在尝试通过REST API调用数据流模板，但是，当在正文中指定参数时，会引发 INVALID_ARGUMENT 错误。删除参数字段后，它可以正常工作。我已经尝试过 Javascript 和 Python，但得到了完全相同的错误。

from googleapiclient.discovery import build
from oauth2client.client import GoogleCredentials

def invoke_dataflow_job():
    credentials = GoogleCredentials.get_application_default()
    service = build('dataflow', 'v1b3', credentials=credentials)

    TEMPLATE_LOCATION = 'gs://xxx';
    PROJECT_ID = 'xxx';
    JOB_NAME = 'xxx';
    LOCATION = 'europe-west1';
    ZONE = 'europe-west1-b';
    TEMP_LOCATION = 'xxx';

    BODY = {
        'jobName': JOB_NAME,
        'gcsPath': TEMPLATE_LOCATION,
        'parameters': {
           'messageToPrint': 'Blue sky'
        },
        'environment': {
           'tempLocation': TEMP_LOCATION,
           'zone': ZONE,
        }
    }

    request = service.projects().locations().templates().create(projectId=PROJECT_ID, location=LOCATION, body=BODY)
    response = request.execute()
    return response

REST API 是否支持传入参数？查看示例代码，我相信它应该。

有什么建议么？

错误信息：

The workflow could not be created. Causes: (4adc3dbfd180d8a2): Found unexpected parameters: ['messageToPrint' (perhaps you meant 'userAgent')]

更新1：

样本自由度：

public static class BuildPathFn extends DoFn<String, Void> {
    private static final long serialVersionUID = -2815123956194177539L;
    private final ValueProvider<String> baseDir; 
    private final ValueProvider<String> year; 
    private final ValueProvider<String> month; 
    private final ValueProvider<String> day; 
    private final ValueProvider<String> hour; 
    private final ValueProvider<String> filePattern; 

    public BuildPathFn (ValueProvider<String> baseDir, ValueProvider<String> year, 
                            ValueProvider<String> month, ValueProvider<String> day, 
                            ValueProvider<String> hour, ValueProvider<String> filePattern) {
        this.baseDir = baseDir;
        this.year = year;
        this.month = month;
        this.day = day;
        this.hour = hour;
        this.filePattern = filePattern;
    }

    @ProcessElement
    public void processElement(@Element String element, OutputReceiver<Void> receiver) {
        try {
            String path = baseDir.get() + "/" + year.get() + "/" + month.get() + "/" + day.get() + "/" + hour.get() + "/" + filePattern.get();
            LOG.info("BuildPathFn >> Path: {}", path);
        } catch (Exception e) {
            LOG.error("BuildPathFn >> Exception: {}", e.getMessage()); 

        }
    }
}

运行时输出：

BuildPathFn >> Path: true/true/true/true/true/true

用于构建模板的 mvn 命令的一部分：

 ".... --baseDir --year --month --day --hour --filePattern"

标签： google-cloud-dataflowapache-beamdataflow

解决方案

代码很好，它是传递参数的正确方法。请记住，该选项需要在模板中定义为ValueProvider。暂存模板时，不要传递您希望在运行时解析的任何参数。然后，在使用描述中已有的代码调用模板时（即使用parameters内部请求正文），应评估选项值。

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