We are seeing these errors on system tests due to the python3 merge:
I ran one of the system tests at the commit prior to the python3 merge (https://github.com/apache/kafka/commit/40a23cc0c2e1efa8632f59b093672221a3c03c36) and it ran fine:
I ran the exact same test file at the next commit – the python3 commit at https://github.com/apache/kafka/commit/4e65030e055104a7526e85b563a11890c61d6ddf – and it failed with the import error. The test results show no report.html file because nothing ran: http://testing.confluent.io/confluent-kafka-system-test-results/?prefix=2020-10-09--001.1602251990--apache--trunk--7947c18b5/
Not sure when this began because I do see these tests running successfully during the development process as documented in https://issues.apache.org/jira/browse/KAFKA-10402 (`tests run: 684` as recently as 9/20 in that ticket). But the PR build (rebased onto latest trunk) showed the above import errors and only 606 tests run. I assume those 4 files mentioned include 78 tests.