This test has been observed to have flaky failures.
Apparently, in the failed runs, Streams had entered a rebalance
before some of the assertions were made. We recently made
IQ a little stricter on whether it would return errors instead of
null responses in such cases:
KAFKA-10598: Improve IQ name and type checks (#9408)
As a result, we have started seeing failures now instead of
silently executing an invalid test (I.e., it was asserting the
return to be null, but the result was null for the wrong
reason).
Now, if the test discovers that Streams is no longer running,
it will repeat the verification until it actually gets a valid
positive or negative result.
Reviewers: Chia-Ping Tsai <chia7712@apache.org>
John Roesler