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Posted to hdfs-issues@hadoop.apache.org by "Steve Vaughan (Jira)" <ji...@apache.org> on 2022/08/08 15:03:00 UTC

[jira] [Assigned] (HDFS-16685) DataNode registration fails because getHostName returns an IP address

     [ https://issues.apache.org/jira/browse/HDFS-16685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Vaughan reassigned HDFS-16685:
------------------------------------

    Assignee: Steve Vaughan

> DataNode registration fails because getHostName returns an IP address
> ---------------------------------------------------------------------
>
>                 Key: HDFS-16685
>                 URL: https://issues.apache.org/jira/browse/HDFS-16685
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>         Environment: Run in Kubernetes using Java 11.  
>            Reporter: Steve Vaughan
>            Assignee: Steve Vaughan
>            Priority: Major
>
> The call to dnAddress.getHostName() can return an IP address encoded as a string, which is then rejected because unresolved addresses can result in performance impacts due to repetitive DNS lookups later.  We can detect when this situation occurs, and perform a DNS reverse name lookup to fix the issue.
> Bouncing a DataNode in a managed environment results in a new IP address allocation, and the new instance fails to register with the NameNode.



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