ZooKeeper
HDP 2.5.0 provides ZooKeeper 3.4.6 and the following Apache patches:
ZOOKEEPER-706: Large numbers of watches can cause session re-establishment to fail.
ZOOKEEPER-1506: Re-try DNS hostname -> IP resolution if node connection fails.
ZOOKEEPER-1574: Set svn:eol-style property to native.
ZOOKEEPER-1575: Adding .gitattributes to prevent CRLF and LF mismatches for source and text files.
ZOOKEEPER-1576: ZooKeeper cluster - failed to connect to cluster if one of the provided IPs causes java.net.UnknownHostException.
ZOOKEEPER-1791: ZooKeeper package includes unnecessary jars that are part of the package.
ZOOKEEPER-1848: [WINDOWS] Java NIO socket channels does not work with Windows ipv6 on JD.
ZOOKEEPER-1876: Add support for installing windows services in .cmd scripts.
ZOOKEEPER-1888: ZkCli.cmd commands fail with "'java' is not recognized as an internal or external command".
ZOOKEEPER-1897: ZK Shell/Cli not processing commands.
ZOOKEEPER-1926: Unit tests should only use build/test/data for data.
ZOOKEEPER-1952: Default log directory and file name can be changed.
ZOOKEEPER-2053: ZooKeeper scripts should honor ZOOKEEPER_HOME
ZOOKEEPER-2064: Prevent resource leak in various classes.