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https://issues.apache.org/jira/browse/BEAM-6666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767757#comment-16767757
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Heejong Lee commented on BEAM-6666:
-----------------------------------
multiple related issues are reported to gRPC since 2017 but the problem doesn't
look fundamentally fixed.
* [https://github.com/grpc/grpc/issues/17986]
* [https://github.com/grpc/grpc/issues/13873]
* [https://github.com/grpc/grpc/issues/13998]
* [https://github.com/grpc/grpc/issues/15334]
* [https://github.com/grpc/grpc/issues/15557]
> subprocess.Popen hangs after use of gRPC channel
> ------------------------------------------------
>
> Key: BEAM-6666
> URL: https://issues.apache.org/jira/browse/BEAM-6666
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Heejong Lee
> Assignee: Heejong Lee
> Priority: Major
>
> subprocess.Popen randomly hangs after use of gRPC channel. This makes
> cross-language wordcount test fail because the test uses Popen to launch
> Dockerized Flink job server in `PortableRunner.run_pipeline` after use of
> gRPC channel for the expansion service in `ExternalTransform.expand`. Few
> symptoms are listed below:
> * Hanging at `docker_path = check_output(['which', 'docker']).strip()`
> * Hanging at `self.docker_process = Popen(cmd)`
> * Crashing with `assertion failed: pthread_mutex_lock(mu) == 0` message
>
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