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[備忘録] Google Cloud Dataflow APIでLocationを指定する

Last updated at Posted at 2019-08-19

なにこれ

自作Dataflow TemplateをAPIでlaunchする際、Location(Region)を指定していたら地味なところでハマったので備忘としてのメモ。同じ境遇の方がいればその助けになれば幸いです。

問題

公式ドキュメントに沿って自作Dataflow Templateの実行をしようとした際、Locationの指定があると下記のようにエラーとなった。

The workflow could not be created, since it was sent to an invalid regional endpoint (asia-northeast1). Please resubmit to a valid Cloud Dataflow regional endpoint.

※社内のめんどくさいポリシー上、asia-northeast1を利用する必要があります。

対処法

これも公式ドキュメントには書いてありました。公式最強。
https://cloud.google.com/dataflow/docs/reference/rest/

projects.templates.launchではなく、projects.locations.templates.launch を利用すれば良かったみたいです。

なんでLocationの有無でAPIが分かれてるのか。。。

実装

公式にある実装例に、.locations()locationパラメータを追加するだけでOK。

example.py
from oauth2client.client import GoogleCredentials
from oauth2client.service_account import ServiceAccountCredentials
from apiclient.discovery import build

PROJECTID = "{{YOURPROJECTID}}"
LOCATION = "asia-northeast1" ## 顧客が本当に指定したいRegion
GCSPATH = "gs://{{YOURBUCKETPATH}}/{{YOURTEMPLATE}}" ## template

credentials = GoogleCredentials.get_application_default()
service = build("dataflow", "v1b3", credentials=credentials)

## RequestBody
body = {
    "environment": {
      ...
    },
    "parameters": {
      ...
    },
    "jobName": "{{YOURJOBNAME}}",
}
## REST:: v1b3.projects.locations.templates
req = service.projects().locations().templates().launch(
          projectId=PROJECTID, location=LOCATION,
          gcsPath=GCSPATH, body=body
      )
res = req.execute()
...
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