GitHub user robshep added a comment to the discussion: Cannot parse <null> 
schema

I can't relaiably re-produce this, but the issue persists.

Thanks @dhinesherode91 for adding your observations.

We do not have this load. We have a single standalone running on ample VM (no 
cpu, memory , i/o or disk pressures) with usual statistics output of 0.3msg/sec

We get this error when re-deploying the only consumer application. (producer 
remains connected).

Restarting one or more times resolves the issue to the point where a valid 
schema definition is printed to the console, not a null one. (so we deploy 
manually for now)

I can't comment on this timing related workaround (_maybe_, **possibly**, there 
is nothing in the queue, then on a restart there is - next time we re-deploy I 
will poll the admin interface for queue length and feedback

If we leave it, after a null schema is found, it does not recover and no msgs 
are processed on the topic.

**However**, 
We run the same application in integration tests daily, using an ephemeral 
pular-standalone in a docker container to test against and never see this 
issue. 

GitHub link: 
https://github.com/apache/pulsar/discussions/18948#discussioncomment-4414973

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