问题描述
我正在尝试在云 Dataflow 上运行 apache-beam 管道.原始函数已部署为一个云函数，该函数应该创建一个读取文本文件并插入到大查询中的 Dataflow 作业.但它无法在 Dataflow 上运行.下面给出了函数和错误.
I am trying to run an apache-beam pipeline on cloud Dataflow. The original function has been deployed as a cloud function which is supposed to create a Dataflow job that reads a text file and inserts into big query. But it fails to run on Dataflow. The function and error are given below.
from apache_beam.options.pipeline_options import PipelineOptions
from apache_beam.options.pipeline_options import GoogleCloudOptions
from apache_beam.options.pipeline_options import StandardOptions
import apache_beam as beam
class Split(beam.DoFn):
def process(self, element):
element = element.split(',')
return [{
'field_1': element[0],
'field_2': element[1],
'field_3': element[2]}]
def main(data, context):
options = PipelineOptions()
google_cloud_options = options.view_as(GoogleCloudOptions)
google_cloud_options.project = my-project
google_cloud_options.job_name = job_name
google_cloud_options.staging_location = staging_location
google_cloud_options.temp_location = temp_location
google_cloud_options.service_account_email = service_account_email
options.view_as(StandardOptions).runner = 'DataflowRunner'
p = beam.Pipeline(options=options)
with p:
(
p
| 'ReadData' >> beam.io.ReadFromText(gs://source_file_location)
| 'ParseCSV' >> beam.ParDo(Split())
| 'WriteToBigQuery' >> beam.io.WriteToBigQuery(table=bq_table,
schema=schema,
write_disposition=beam.io.BigQueryDisposition.WRITE_APPEND)
)
result = p.run()
result.wait_until_finish()
if __name__ == '__main__':
main('data', 'context')
我在 Dataflow 上遇到的错误是
The error that I get on Dataflow is
Error message from worker: Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/apache_beam/internal/pickler.py",
line 286, in loads return dill.loads(s) File "/usr/local/lib/python3.7/site-packages/dill/_dill.py",
line 275, in loads return load(file, ignore, **kwds) File "/usr/local/lib/python3.7/site-packages/dill/_dill.py",
line 270, in load return Unpickler(file, ignore=ignore, **kwds).load() File "/usr/local/lib/python3.7/site-packages/dill/_dill.py",
line 472, in load obj = StockUnpickler.load(self) File "/usr/local/lib/python3.7/site-packages/dill/_dill.py",
line 462, in find_class return StockUnpickler.find_class(self, module, name) ModuleNotFoundError:
No module named 'main' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/local/lib/python3.7/site-packages/dataflow_worker/batchworker.py", line 648, in do_work work_executor.execute() File "/usr/local/lib/python3.7/site-packages/dataflow_worker/executor.py", line 176, in execute op.start() File "apache_beam/runners/worker/operations.py",
line 649, in apache_beam.runners.worker.operations.DoOperation.start File "apache_beam/runners/worker/operations.py",
line 651, in apache_beam.runners.worker.operations.DoOperation.start File "apache_beam/runners/worker/operations.py",
line 652, in apache_beam.runners.worker.operations.DoOperation.start File "apache_beam/runners/worker/operations.py",
line 261, in apache_beam.runners.worker.operations.Operation.start File "apache_beam/runners/worker/operations.py",
line 266, in apache_beam.runners.worker.operations.Operation.start File "apache_beam/runners/worker/operations.py",
line 597, in apache_beam.runners.worker.operations.DoOperation.setup File "apache_beam/runners/worker/operations.py",
line 602, in apache_beam.runners.worker.operations.DoOperation.setup File "/usr/local/lib/python3.7/site-packages/apache_beam/internal/pickler.py",
line 290, in loads return dill.loads(s) File "/usr/local/lib/python3.7/site-packages/dill/_dill.py",
line 275, in loads return load(file, ignore, **kwds) File "/usr/local/lib/python3.7/site-packages/dill/_dill.py", line 270, in load return Unpickler(file, ignore=ignore, **kwds).load() File "/usr/local/lib/python3.7/site-packages/dill/_dill.py",
line 472, in load obj = StockUnpickler.load(self) File "/usr/local/lib/python3.7/site-packages/dill/_dill.py",
line 462, in find_class return StockUnpickler.find_class(self, module, name)
ModuleNotFoundError: No module named 'main'
推荐答案
您可能需要将您的代码(包括您的 DoFn)作为依赖项捆绑在一个单独的文件中；参见 https://beam.apache.org/documentation/sdks/python-管道依赖/
You may have to bundle up your code (including your DoFn) as a dependency in a separate file; see https://beam.apache.org/documentation/sdks/python-pipeline-dependencies/
在这种情况下，听起来云函数从名为 main.py 的文件中执行您的文件；那会产生这种错误.我建议将您的代码打包为依赖项，这里的代码只是 from my_lib import main.
In this case, it sounds like cloud functions execs your file from a file named main.py; that would give this kind of error. I would suggest packaging up your code as a dependency and the code here would simply be from my_lib import main.
这篇关于Google Cloud DataFlow:ModuleNotFoundError:没有名为“main"的模块的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！