ableegoldman opened a new pull request #11364:
URL: https://github.com/apache/kafka/pull/11364


   Recently a user hit this TaskAssignmentException due to a bug in their regex 
that meant no topics matched the pattern subscription, which in turn meant that 
it was impossible to resolve the number of partitions of the downstream 
repartition since there was no upstream topic to get the partition count for. 
Debugging this was pretty difficult and ultimately came down to stepping 
through the code line by line, since even with TRACE logging we only got a 
partial picture. 
   
   We should expand the logging to make sure the TRACE logging hits both 
conditional branches, and improve the error message with a suggestion for what 
to look for should someone hit this in the future


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