ZooKeeper
This release provides ZooKeeper 3.4.6 with no additional Apache patches.
HDP 2.6.1 provided ZooKeeper 3.4.6 and the following Apache patches:
ZOOKEEPER-2141: ACL cache in DataTree never removes entries.
HDP 2.6.0 provided ZooKeeper 3.4.6 and the following Apache patches:
ZOOKEEPER-2227: stmk four-letter word fails execution at server while reading trace mask argument.