答案 0 :(得分:2)
数据流作业中的当前工作人数显示在消息日志的autoscaling
下。例如,当我在Cloud Shell中显示作业日志时,我以快速作业为例,并收到以下消息:
INFO:root:2019-01-28T16:42:33.173Z: JOB_MESSAGE_DETAILED: Autoscaling: Raised the number of workers to 0 based on the rate of progress in the currently running step(s).
INFO:root:2019-01-28T16:43:02.166Z: JOB_MESSAGE_DETAILED: Autoscaling: Raised the number of workers to 1 based on the rate of progress in the currently running step(s).
INFO:root:2019-01-28T16:43:05.385Z: JOB_MESSAGE_DETAILED: Workers have started successfully.
INFO:root:2019-01-28T16:43:05.433Z: JOB_MESSAGE_DETAILED: Workers have started successfully.
现在,您可以在数据流API中使用projects.jobs.messages.list
方法,并将minimumImportance
参数设置为JOB_MESSAGE_BASIC
,以查询这些消息。
您将收到类似于以下内容的回复:
...
"autoscalingEvents": [
{...} //other events
{
"currentNumWorkers": "1",
"eventType": "CURRENT_NUM_WORKERS_CHANGED",
"description": {
"messageText": "(fcfef6769cff802b): Worker pool started.",
"messageKey": "POOL_STARTUP_COMPLETED"
},
"time": "2019-01-28T16:43:02.130129051Z",
"workerPool": "Regular"
},
要扩展此范围,您可以创建一个python脚本来解析响应,并且仅从列表currentNumWorkers
中的最后一个元素中获取参数autoscalingEvents
,以了解最后一个(因此,当前)工作中的工人人数。
请注意,如果不存在此参数,则表示工作程序数为零。
修改:
我做了一个快速的python脚本,使用上面提到的API从消息日志中检索了当前的工作人数:
from google.oauth2 import service_account
import googleapiclient.discovery
credentials = service_account.Credentials.from_service_account_file(
filename='PATH-TO-SERVICE-ACCOUNT-KEY/key.json',
scopes=['https://www.googleapis.com/auth/cloud-platform'])
service = googleapiclient.discovery.build(
'dataflow', 'v1b3', credentials=credentials)
project_id="MY-PROJECT-ID"
job_id="DATAFLOW-JOB-ID"
messages=service.projects().jobs().messages().list(
projectId=project_id,
jobId=job_id
).execute()
try:
print("Current number of workers is "+messages['autoscalingEvents'][-1]['currentNumWorkers'])
except:
print("Current number of workers is 0")
一些注意事项:
作用域是您要引用的服务帐户密钥(在from_service_account_file
函数中)所需的权限,以便对API进行调用。需要此行来验证API。您可以使用this list中的任何一个,为了简便起见,我只使用了具有project/owner
权限的服务帐户密钥。
如果您想了解有关Python API客户端库的更多信息,请选中this documentation和this samples。
答案 1 :(得分:-2)
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