The release notes include this resolved issue: [KAFKA-6390] - Update ZooKeeper to 3.4.11, Gradle and other minor updates
I saw 3.4.10 in the downloaded bits, not 3.4.11. It looks like the update to ZooKeeper 3.4.11 was done, but then reverted (commit 825bfe5) because of ZOOKEEPER-2960. The reversion is not visible in KAFKA-6390, nor elsewhere in release notes. Since the 1.1.0 release is not affected by the ZK 3.4.11 bug, it might be a good idea to say so. I had to search a bit to find this result. https://issues.apache.org/jira/browse/KAFKA-6390 https://github.com/apache/kafka/commit/825bfe5adefe4b5f967068b332cb0feedd7dc4fc https://issues.apache.org/jira/browse/ZOOKEEPER-2960
