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Posted to hdfs-dev@hadoop.apache.org by "Steve Vaughan (Jira)" <ji...@apache.org> on 2022/07/25 14:31:00 UTC

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

Steve Vaughan created HDFS-16685:
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             Summary: 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


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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