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https://issues.apache.org/jira/browse/ZOOKEEPER-1666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13602412#comment-13602412
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George Cao commented on ZOOKEEPER-1666:
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The key is we need to set the *hostName* property explicitly. If not, the
Reverse DNS lookup is triggered when you invoke the getHostName() method. In
fact, JDK 7 introduced a new method getHostString(). This method first check if
hostName was set, if true, just return the hostname, or return the textual IP
string.
> Avoid Reverse DNS lookup if the hostname in connection string is literal IP
> address.
> ------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-1666
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1666
> Project: ZooKeeper
> Issue Type: Improvement
> Components: java client
> Reporter: George Cao
> Attachments: ZOOKEEPER-1666.patch
>
>
> 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.
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