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https://issues.apache.org/jira/browse/HADOOP-19695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18023203#comment-18023203
 ] 

ASF GitHub Bot commented on HADOOP-19695:
-----------------------------------------

hadoop-yetus commented on PR #7979:
URL: https://github.com/apache/hadoop/pull/7979#issuecomment-3340611486

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   | +1 :green_heart: |  unit  | 278m  6s |  |  hadoop-hdfs in the patch 
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   |  |   | 549m 29s |  |  |
   
   
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   |----------:|:-------------|
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7979/8/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/7979 |
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7979/8/testReport/ |
   | Max. process+thread count | 2198 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common 
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   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   




> Add dual-stack/IPv6 Support to HttpServer2
> ------------------------------------------
>
>                 Key: HADOOP-19695
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19695
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: hadoop-common
>            Reporter: Ferenc Erdelyi
>            Assignee: Ferenc Erdelyi
>            Priority: Minor
>              Labels: pull-request-available
>
> To support clients connecting to JHS via IPv6, we need to equip the YARN 
> WebApp class to bind to an IPv6 address. WebApp uses the HttpServer2, and 
> adding the IPv6 connector to this class makes the solution more elegant.
> To enable dual-stack or IPv6 support, use InetAddress.getAllByName(hostname) 
> to resolve the IP addresses of a host.
> When the system property java.net.preferIPv4Stack is set to true, only IPv4 
> addresses are returned, and any IPv6 addresses are ignored, so no extra check 
> is needed to exclude IPv6.
> When java.net.preferIPv4Stack is false, both IPv4 and IPv6 addresses may be 
> returned, and any IPv6 addresses will also be added as connectors.
> To disable IPv4, you need to configure the OS at the system level.
>  



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