v0.25.0 with grpcio==1.3.5 hangs in completion_queue.poll()

I’m not sure that’s the right place to file this issue. It could be something well-known one of another project. Nevertheless here it is: I’m running Google App Engine Flexible VM. The webservice uses gunicorn + gevent + flask chain. It uses this lib v0.25.0 Yesterday, upon new deployment, I’ve faced with old and relatively seldom issue - it hangs in completion_queue.poll() in deep of grpcio. I have been seeing such an issue from time to time. However it has become a nightmare with recent deployment. Workers end up in critical timeout and been rebooted all the way. And here’s what I’ve found out:

• my recent deployment picks grpcio==1.3.5 - it hangs all the way
• I’ve added explicit dependency to grpcio==1.3.0 and things go well.

[tcroiset]

We have the same issue (and indeed grpcio==1.3.0 fix it)

[AnilkumarKomanduru]

Hi, Im using ttn version 2.1.1, and still seeing same issue, I did not use any certificate for your info for testing.

gapic-google-cloud-datastore-v1==0.15.3 gapic-google-cloud-error-reporting-v1beta1==0.15.3 gapic-google-cloud-logging-v2==0.91.3 gapic-google-cloud-pubsub-v1==0.15.4 gapic-google-cloud-spanner-admin-database-v1==0.15.3 gapic-google-cloud-spanner-admin-instance-v1==0.15.3 gapic-google-cloud-spanner-v1==0.15.3 gapic-google-cloud-speech-v1beta1==0.15.3 gapic-google-cloud-vision-v1==0.90.3 gitdb==0.6.4 gitdb2==2.0.2 gitpython==2.1.10 google-api-core==0.1.4 google-api-python-client==1.7.3 google-auth==1.5.0 google-auth-httplib2==0.0.3 google-cloud==0.33.1 google-cloud-bigquery==0.28.0 google-cloud-bigquery-datatransfer==0.1.1 google-cloud-bigtable==0.28.1 google-cloud-container==0.1.1 google-cloud-core==0.28.1 google-cloud-datastore==1.4.0 google-cloud-dns==0.28.0 google-cloud-error-reporting==0.28.0 google-cloud-firestore==0.28.0 google-cloud-language==1.0.2 google-cloud-logging==1.4.0 google-cloud-monitoring==0.28.1 google-cloud-pubsub==0.30.1 google-cloud-resource-manager==0.28.1 google-cloud-runtimeconfig==0.28.1 google-cloud-spanner==0.29.0 google-cloud-speech==0.30.0 google-cloud-storage==1.6.0 google-cloud-trace==0.17.0 google-cloud-translate==1.3.1 google-cloud-videointelligence==1.0.1 google-cloud-vision==0.29.0 google-gax==0.15.16 google-resumable-media==0.3.1 googleapis-common-protos==1.5.3 grpc-google-iam-v1==0.11.4 grpcio==1.7.3 httplib2==0.11.3 idna==2.7 imagesize==0.7.1 intelhex==2.1 Jinja2==2.9.6 MarkupSafe==1.0 oauth2client==3.0.0 packaging==17.1 paho-mqtt==1.3.1 ply==3.8 proto-google-cloud-datastore-v1==0.90.4 proto-google-cloud-error-reporting-v1beta1==0.15.3 proto-google-cloud-logging-v2==0.91.3 proto-google-cloud-pubsub-v1==0.15.4 proto-google-cloud-spanner-admin-database-v1==0.15.3 proto-google-cloud-spanner-admin-instance-v1==0.15.3 proto-google-cloud-spanner-v1==0.15.3 proto-google-cloud-speech-v1beta1==0.15.3 proto-google-cloud-vision-v1==0.90.3 protobuf==3.6.0 psutil==5.4.6 PTable==0.9.2 pyasn1==0.4.3 pyasn1-modules==0.2.1 pycparser==2.18 Pygments==2.2.0 pyparsing==2.2.0 pyreadline==2.1 pyserial==3.3 python-jose==3.0.0 pytz==2017.2 PyYAML==3.12 requests==2.19.1 rsa==3.4.2 selenium==2.53.6 six==1.10.0 smmap==0.9.0 smmap2==2.0.3 snowballstemmer==1.2.1 Sphinx==1.5.1 spider==3.3.1 ttn==2.1.1.