docker / docker/docker-py

log finish but container still running

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Dominant language
Python
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Description

I use docker-py to run some jobs. After create and start a container using the low-level API, function docker_client.logs(container=container_id, stream=True) used to get the log until the container finish. This always works well. But recently, some containers were still running but the log function had already finished running.
Job in these containers used pytorch and multiprocess. Dose it matter? And what determines the end of log output?

Environment :
ubuntu:16.04
docker: 18.06.0-ce
py-docker: 3.5.0
docker API: v1.35

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Research direction

Start by reproducing the behavior with the low-level container create/start flow and docker_client.logs(container=container_id, stream=True) under the listed Docker and docker-py versions. Compare log-stream termination with container state while a PyTorch multiprocess job runs; done means the cause and conditions for ending the log output are documented or covered by a regression test.

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Assessment

Tech stack
docker, python
Domain
api
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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