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https://issues.apache.org/jira/browse/HIVE-28785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17947136#comment-17947136
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Dmitriy Fingerman commented on HIVE-28785:
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I did more investigation and this is not an issue.
*_InetAddress.getByName()_* returns address based on preferences.
When DNS entry has both IPv4 and IPv6 IPs,
* if *_java.net.preferIPv6Addresses=false_* and
_{*}java.net.preferIPv4Stack=false{*},_ it returns IPv4 address.
* if *_java.net.preferIPv6Addresses=true_* or
_{*}java.net.preferIPv4Stack=false{*},_ it returns IPv6 address.
* if _{*}java.net.preferIPv4Stack=true{*},_ it returns IPv4 address.
> Fix InetAddress.getByName is not safe with IPv6 stack
> -----------------------------------------------------
>
> Key: HIVE-28785
> URL: https://issues.apache.org/jira/browse/HIVE-28785
> Project: Hive
> Issue Type: Sub-task
> Reporter: Dmitriy Fingerman
> Priority: Major
>
> Hive has code occurences as following:
> {code:java}
> InetAddress.getByName(String){code}
> * Only returns {*}one IP address{*}, even if multiple (IPv4 and IPv6) exist.
> * May return an IPv4 address even when an IPv6 address is preferred.
> Safer Alternative:
> Use InetAddress.getAllByName(hostname) to get all possible addresses and
> explicitly choose an IPv6 one if needed.
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