Hello,
due to some pending resource changes we thought it might be a good chance to upgrade from 6.0.3 to 6.0.4. That includes a kafka version change from 2.2.1 to 2.4.1
kafka 2.4.1 comes with zookeeper 3.5.7 and we quiet quickly run into this upstream bug (resolved in 3.5.8):
https://issues.apache.org/jira/browse/ZOOKEEPER-2164
I would go so far to say that zookeeper 3.5.7 is broken / must not be used (at least in the configuration with 3 nodes that we run) [so we rolled back]
just had a quick peak into master, but as far as I could see master is still using kafka 2.4.1 (and thus bundling zookeeper 3.5.7?) If that is the case, you might consider upgrading that somehow
thanks and best regards
Paul