[ZOOKEEPER-1666] Avoid Reverse DNS lookup if the hostname in connection string is literal IP address.

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.5
• Fix Version/s: 3.4.6, 3.5.0
• Component/s: java client
• Labels: patch test
• Release Note: Try to avoid reverse name service look up when the connection string consists of literal IP addresses but not real host names.
• Assignee: George Cao
• Reporter: George Cao
• Created: 14/Mar/13 04:58
• Updated: 30/Jan/17 12:08
• Resolved: 13/Nov/13 14:18

Description

In our ENV, if the InetSocketAddress.getHostName() is called and the host name in the connection string are literal IP address, then the call will trigger a reverse DNS lookup which is very slow.
And in this situation, the host name can simply set as the IP without causing any problem.

Issue Links

• blocks: ZOOKEEPER-1652 zookeeper java client does a reverse dns lookup when connecting
• breaks: OOZIE-1959 TestZKUtilsWithSecurity fails
• is duplicated by: ZOOKEEPER-1652 zookeeper java client does a reverse dns lookup when connecting
• relates to: ZOOKEEPER-2184 Zookeeper Client should re-resolve hosts when connection attempts fail