[jira] [Created] (ZOOKEEPER-1734) Zookeeper fails to connect if one zookeeper host is down on EC2 when using elastic IP (UnknownHostException)

["Andy Grove (JIRA)" <ji...@apache.org>]

Andy Grove created ZOOKEEPER-1734:
-------------------------------------

             Summary: Zookeeper fails to connect if one zookeeper host is down on EC2 when using elastic IP (UnknownHostException)
                 Key: ZOOKEEPER-1734
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1734
             Project: ZooKeeper
          Issue Type: Bug
          Components: java client
    Affects Versions: 3.4.5
         Environment: Amazon EC2. Linux.
            Reporter: Andy Grove


We use Amazon Elastic IP for zookeeper hosts so that the zookeeper hosts have the same IP address after a restart.

The issue is, if one host is down then we cannot connect to the other hosts.

Here is an example connect string:

"ec2-1-2-3-4.compute-1.amazonaws.com, ec2-4-3-2-1.compute-1.amazonaws.com, ec2-5-5-5-5.compute-1.amazonaws.com"

If all three hosts are up, we can connect. If one host is down, then we cannot create a Zookeeper instance due to an UnknownHost exception, even though the other servers in the connect string are valid.

java.net.UnknownHostException: ec2-5-5-5-5.compute-1.amazonaws.com 
at java.net.InetAddress.getAllByName0(InetAddress.java:1243) 
at java.net.InetAddress.getAllByName(InetAddress.java:1155) 
at java.net.InetAddress.getAllByName(InetAddress.java:1091) 
at org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:60) 
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:445) 

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira