Library error on docker container (AWS Lambda)-CodePudding

I'm looking to execute a python script on AWS Lambda using a Docker container loaded on AWS ECR. I've managed to create a docker container starting from the amazon image they recommend using for a python script. This is the Dockerfile:


# Copy function code
COPY app.py ${LAMBDA_TASK_ROOT}
COPY config.py ${LAMBDA_TASK_ROOT}
COPY abort_occurrance.txt ${LAMBDA_TASK_ROOT}
COPY actions_logging.txt ${LAMBDA_TASK_ROOT}
COPY execution_log.txt ${LAMBDA_TASK_ROOT}
COPY warning_job_occurrance.txt ${LAMBDA_TASK_ROOT}

# Install the function's dependencies using file requirements.txt
# from your project folder.

COPY requirements.txt  .
RUN  pip3 install -r requirements.txt --target "${LAMBDA_TASK_ROOT}"

CMD ["app.py"]
ENTRYPOINT ["python3"]

As seen here, app.py is my script that has to run on container start. Once created the image, i can easily start my container on local machine, but when i load it on AWS ECR and link it to AWS Lambda it won't work. This is the error that is returned on CloudWatch:

Traceback (most recent call last):
File "app.py", line 2, in <module>
from exchangelib import Credentials, Account
File "/var/task/exchangelib/__init__.py", line 3, in <module>
from .account import Account, Identity
File "/var/task/exchangelib/account.py", line 12, in <module>
from .folders import Folder, AdminAuditLogs, ArchiveDeletedItems, ArchiveInbox, ArchiveMsgFolderRoot, \
File "/var/task/exchangelib/folders/__init__.py", line 16, in <module>
from .roots import Root, ArchiveRoot, PublicFoldersRoot, RootOfHierarchy
File "/var/task/exchangelib/folders/roots.py", line 17, in <module>
class RootOfHierarchy(BaseFolder, metaclass=EWSMeta):
File "/var/task/exchangelib/folders/roots.py", line 26, in RootOfHierarchy
_subfolders_lock = Lock()
File "/var/lang/lib/python3.8/multiprocessing/context.py", line 68, in Lock
return Lock(ctx=self.get_context())
File "/var/lang/lib/python3.8/multiprocessing/synchronize.py", line 162, in __init__
SemLock.__init__(self, SEMAPHORE, 1, 1, ctx=ctx)
File "/var/lang/lib/python3.8/multiprocessing/synchronize.py", line 57, in __init__
sl = self._semlock = _multiprocessing.SemLock(
OSError: [Errno 38] Function not implemented
START RequestId: f8056c6e-9ca4-4aba-a1aa-191dca52ea35 Version: $LATEST
END RequestId: f8056c6e-9ca4-4aba-a1aa-191dca52ea35
REPORT RequestId: f8056c6e-9ca4-4aba-a1aa-191dca52ea35  Duration: 3003.57 ms    Billed Duration: 3000 ms    Memory Size: 128 MB Max Memory Used: 22 MB  
2021-09-15T12:52:25.585Z f8056c6e-9ca4-4aba-a1aa-191dca52ea35 Task timed out after 3.00 seconds

How is it possible that a container works on local docker but when i test it on lambda it does not work?

Thank you

CodePudding user response：

Lambda does not support parallel processing for all runtimes. This could be why it's working local but not in lambda.

https://aws.amazon.com/blogs/compute/parallel-processing-in-python-with-aws-lambda/