error syncing pod - failed to start container artifact (python SDK)

```

Error syncing pod 5966....e59c ("-08131110-7hcg-harness-fbm2_default(5966....e59c)"),
skipping: failed to "StartContainer" for "artifact" with CrashLoopBackOff: "Back-off 5m0s restarting
failed container=artifact pod=-08131110-7hcg-harness-fbm2_default(5966.....e59c)"
```

Seeing these in streaming pipeline. Running pipeline in batch mode I'm not seeing anything. Messages appear about every 0.5 - 5 seconds

I've been trying to efficiently scale my streaming pipeline and found that adding more workers / dividing into more groups isn't scaling as well as I expect. Perhaps this is contributing (how do I tell if workers are being utilized or not?)

One pipeline which never completed (got to one of the last steps and then log messages simply ceased without error on the workers) had this going on in the kubelet logs. I checked some of my other streaming pipelines and found the same thing going on, even though they would complete.

In a couple of my streaming pipelines, I've gotten the following error message, despite the pipeline eventually finishing:
```

Processing stuck in step s01 for at least 05m00s without outputting or completing in state process
```

Perhaps they are related?

This is running with 5 or 7 (or more) workers in streaming mode. I don't see this when running with 1 worker

The pipeline uses requirements.txt and setup.py, as well as using an extra package and using save_main_session.

Imported from Jira [BEAM-7975](https://issues.apache.org/jira/browse/BEAM-7975). Original Jira may contain additional context.
Reported by: jimpremise.